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55th-56th Series Service Bulletin Index

- AIR CONDITIONING -

Subject	Models	Reference
Service Kit hum/vibration	55th	STB 55T-45, Dealer 36
Evaporator Case Water Leaks right turns - modifications	55th-56th	STB 56T-21, Dealer 18
Plenum Chamber Carpet additional part for dealer installation	56th	SC Vol. 29, No. 12, p. 66
Servicing Compressors individual parts, not assemblies	55th-56th	STB 56T-16, Dealer 13

- ACCESSORIES -

Subject	Models	Reference
Antenna:	--	--
- Electric front fender - drive assembly replacement	55th-56th	SSB No. 319, p. 7
- Servicing the Packard (electric) service parts detail	55th-56th-57th	SSB No. 328, p. 5
- Servicing Packard (electric) 55th-56th dome nut and insulator	55th-56th-57th	SSB No. 330, p. 4
Fresh Air Heater Core service part number	55th-56th	SC Vol. 30, No. 9, p. 36
Heater Hose Kinked insufficient heat - reroute	55th	SC Vol. 29, No. 4, p. 25
Radio Bonding Clips electrical interference - installation	55th	SC Vol. 29, No. 7, p. 38
Windshield Washer Cover & Pump Assembly service part	55th-56th	SSB No. 322, p. 3

- BRAKES -

Subject	Models	Reference
Easamatic Power Brakes - Hard Pedal new type vacuum piston - conversion kit	55th	STB 55T-28 (Zones only)
Rear Brake Wear premature - new brake drum	5640-60-70	SSB No. 344, p. 4
Rear Brake Wear, Premature - Overheating hand brake adjustment	5640-60	STB 56T-22, Dealer 19
Rear Brakes premature wear/grab - new wheel cylinders	5640-60	STB 56T-24 (Zones only)
Power Brake Vacuum Check Valve hard pedal - new type with stop washer	All Models	SC Vol. 30, No. 2, p. 7
Stop Light Switch - Torsion Level Suspension removal - socket size	55th-56th	SSB No. 328, p. 5

- CLUTCH -

Subject	Models	Reference
(none issued)	--	--

- TRANSMISSION & OVERDRIVE -

Subject	Models	Reference
Sleeve, Shaft Levers-to-Transmission Extension Lever Rod superseded part	55th-56th	SSB No., 360, p. 7

- TWIN ULTRAMATIC -

Subject	Models	Reference
Accelerator Linkage, Adjusting throttle linkage - shift point	56th	SC Vol. 30, No. 5, p. 18
Band Adjustments clarification of STB 56T-6	56th	STB 56T-11 (Zones only)
Bell Housing Oil Seal leaks - superseded part, use of prelube	56th	SSB No. 351, p. 4
Breather oil loss - check fluid level, relocate	56th	SC Vol. 30, No. 9, p. 34
Buzzing Noise in Reverse pump check valve binding - rework	Twin Ultramatic	SC Vol. 28 No. 12, p. 70
Changes in... (Confidential) production - with part, effective date/unit	55th	STB 55T-11 (Zones only)
Changes in... production - with part, effective date/unit	55th	STB 55T-22 (Zones only)
Changes in... (Confidential) production - with part, effective date/unit	56th	STB 56T-6 (Zones only)
Control Changes to Improve Shift Pattern update to 56th Series - new valving kits	54th-55th	SC Vol. 30, No. 8, p. 29
Control Valve Assemblies, Complete identification - not interchangeable	55th-56th	SSB No. 358, p. 6
Converter:	--	--
- Fluid Leaks damaged washers - use of sealant	23rd-56th	SSB No. 350, p. 1
- Pump Shaft - Oil Pump Rotor Splines - Worn or Stripped new 40-spline service parts	54th-55th-56th	SC Vol. 30, No. 3, p. 10
- Pump Shaft - Oil Pump Rotor Splines - Worn or Stripped - Correction new 40-spline service parts	54th-55th-56th	SC Vol. 30, No. 5, p. 17
- Pump Shaft and Oil Pump Rotor worn/stripped splines - corrections, superseded parts)	54th-55th-56th	SSB No. 331, p. 4
- Pump Shaft - Oil Pump Rotor Splines - see also:	--	"Front Oil Pump"
- Reaction Clutch Sprags premature failure - replace in sets	54th-55th-56th	SSB No. 348, p. 3
- Reaction Clutch Sprags replacement - use of reaction clutch assembly	54th-55th-56th	SSB No. 358, p. 7
- Reactor End Play new measuring method and special tool	55th	SC Vol. 29, No. 3, p. 21
- Reactor End Play revisions to checking method and special tool	56th	STB 55T-52, Dealer 43
- Torque (Reactor End Play) return to prior design and checking method - converter assembly superseded	56th	SSB No. 331, p. 6
- Torque (Reactor End Play) cancellation of wave washer kit	56th	SSB No. 339, p. 4
Direct Drive Clutch:	--	--
- Slippage - Gear Start slipping due to oil - removal of chamfers (reference for SC Vol. 29, No. 9, p. 45)	54th	SC Vol. 28 No. 10, p. 58
- Engagement slipping and shift points	55th	STB 55T-7, Dealer 6
- Engagement shift valve piston and spring	55th	SC Vol. 29, No. 2, p. 18
- Engagement slipping - new high speed governor spring	55th	SC Vol. 29, No. 9, p. 45
- Engagement, Loss of input/crankshaft end play, bushing position, restricted fluid passages - modifications	55th	SSB No. 320, p. 4
- Piston Ring Installation, Converter improper/slow engagement - check ring gap	55th-56th	SSB No. 358, p. 6
Direct Shift Valve Piston Spring Seat clutch engagement point, valve body leaks - correct installation	55th	SC Vol. 29, No. 5, p. 30
Direct Shift Valve Piston Springs interchangeable parts	55th	STB 55T-43, Dealer 34
Engine Runaway low range brake spring changes	54th-55th	STB 56T-2, Dealer 1
Engine Runaway new valve body separator plate, low range brake spring changes	56th	STB 56T-7, Dealer 5
Engine Runaway - Flare - Low Brake Information premature failure of high range clutch - summary of checks and corrections	54th-55th-56th	SC Vol. 30, No. 7, p. 25
Engine Runaway - Low to High Shifts high range clutch piston oil passages restricted - modification	55th	SC Vol. 29, No. 8, p. 40
Engine Runaway - Low to High Shifts low throttle pressure - install extension kit	55th	SC Vol. 29, No. 9, p. 45
Engine Runaway - Low to High Shifts low throttle pressure - install extension kit	55th	STB 55T-32, Dealer 23
Engine Runaway/Flare - see also:	--	"Front Oil Pump" "High Range Clutch" "Low Range Brake" "Push Button Control" "Throttle/Control Linkage"
Filler Tube Length (and dipstick) shorter - not interchangeable	55th	SC Vol. 29, No. 3, p. 19
Fluid Temperature Affects Ultramatic Upshift loss of pressure, bushing wear - pressure tests	55th-56th	SSB No. 339, p. 5
Fluid, Transmission proper type	55th	SC Vol. 29, No. 8, p. 41
Fluid, Transmission - Correction proper type	55th	SC Vol. 29, No. 10, p. 54
Front Oil Pump and Converter Shaft Kits new parts	54th-55th-56th	SC Vol. 30, No. 8, p. 32
Front Oil Pump Oil Passage Restriction Test engine runaway/flare, premature high range clutch failures - diagnosis	55th-56th	SC Vol. 30, No. 6, p. 21
Front Oil Pump - see also:	--	"Converter Pump Shaft"
Gearshift Indicator Pointer misalignment - new clamp	55th	SC Vol. 29, No. 7, p. 37
High Range Clutch:	--	--
- Burning high range clutch spring and piston	55th-56th	SSB No. 327, p. 8
- Burning spring data correction	55th-56th	SSB No. 338, p. 3
- Driving Plate new heavy-duty type - installation procedure	55th-56th	SSB No. 344, p. 2
- (failures) operating precautions	All Ultramatic	SC Vol. 30, No. 4, p. 16
- Housing Identification differentiation - check end play as installed	55th-56th	SSB No. 346, p. 4
- Housing, Part Nos. 458950 and 6484046 damaged seal, insufficient chamfer - return for exchange	55th-56th	SSB No. 346, p. 4
- Housing - Part Nos. 458950 and 6484046 clearance checks - grind welds	55th-56th	SSB No. 359, p. 6
- Problems load pick up and slippage - checks, adjustments, and service precautions	55th-56th	SSB No. 320, p. 5
Hydraulic Tests preliminary service information	Twin Ultramatic	SC Vol. 28 No. 11, p. 62
Leaks - see also:	--	"Bell Housing Oil Seal" "Breather" "Converter" "Oil Loss"
Low Range Brake:	--	--
- Cap distorted - designed shape	56th	SC Vol. 30, No. 5, p. 20
- Functions Improperly distorted cap	55th	STB 55T-17, Dealer 15
- Functions Improperly distorted cap	55th	SC Vol. 29, No. 9, p. 45
- Information harsh, noisy, runaway/flare - correct springs, new separator plate	56th	STB 56T-18, Dealer 15
Low Regulator Valve kickdown runaway - oil passage change	55th	SC Vol. 29, No. 7, p. 38
Low Speed Disturbance direct drive - alter shift point	54th-55th	SC Vol. 30, No. 2, p. 5
Manual Valve Control Lever Inner Stop superseded part - modified installation	55th	SSB No. 324, p. 5
Oil Cooler leaks - internal modifications, same number	55th-56th	SSB No. 322, p. 4
Oil Loss breather relocation	55th-56th	SSB No. 319, p. 5
Oil Loss at Breather level, restrictions, overheating - relocation	23rd-56th	SSB No. 339, p. 3
Park, Locking in pawl and gear clearance - loose, worn, damaged parts	54th-55th-56th	SSB No. 340, p. 4
Parking Lock Sticking manual valve - new parking gear	55th	SC Vol. 29, No. 7, p. 36
Parking Lock Sticking new transmission rod and lever	55th	SC Vol. 30, No. 1, p. 4
Push Button Control:	--	--
- Actuator Shaft (set) Screw accessibility - new Allen head design	56th	SC Vol. 30, No. 7, p. 27
- (actuator-to-manual shaft set screw) superseded part	56th	SSB No. 350, p. 8
- Adjusting Actuator-to-Transmission Control Valve Detent loss/delay of high range - special procedure	56th	SSB No. 338, p. 3
- Armature Test special methods	56th	STB 56T-26, Dealer 20
- Bent Actuator Fingers overtravel - straightening	56th	SC Vol. 30, No. 3, p. 12
- Circuit Breaker superseded part - modification	56th	SSB No. 351, p. 3
- Inoperative overtravel, finger damage - rework contact segment	56th	SSB No. 322, p. 4
- Left-Side Conversion driver accessibility issues	56th	SC Vol. 30, No. 6, p. 23
- Light Leak at control buttons - felt mask	56th	SC Vol. 30, No. 1, p. 3
- (malfunctions) checks, adjustments, and precautions	56th	SSB No. 327, p. 6
- Push Button Type Control preliminary information/service	56th	SC Vol. 29, No. 11, p. 55
- Pressure Switch water leak/shorts - relocation	56th	SC Vol. 30, No. 2, p. 8
- Relay Water Trough water leak/shorts	56th	SC Vol. 30, No. 1, p. 3
- Removal of Control Relay redundant part	56th	SC Vol. 30, No. 1, p. 2
- Removal of Automatic Park Relay pawl damage	56th	STB 56T-25 (Zones only)
- Retaining Clip (Switch Actuator) new service part	56th	SSB No. 324, p. 4
- Supplement Automatic Park Relay added	56th	SC Vol. 29, No. 12, p. 62
- Towing Instructions precautions	56th	STB 55T-46, Dealer 37
- Towing, Road Testing and precautions	56th	STB 56T-4, Dealer 3
- Vent actuator - condensation and oil	56th	SSB No. 322, p. 4
- Water in Actuator leaks at wires	56th	SC Vol. 30, No. 6, p. 22
Pressure Test Plug, (Front) Pump production change - fabricate test adapter	55th	SC Vol. 29, No. 3, p. 20
Rattle (converter) loose direct drive pressure plate screws - replace and/or retorque	Twin Ultramatic	STB 55T-40, Dealer 31
Rear Oil Pump Rotor Sets cost savings - new kits	54th-55th-56th	SC Vol. 30, No. 3, p. 11
Rear Oil Pump Driver premature wear - hardened	54th-55th-56th	STB 55T-47, Dealer 38
Rear Oil Pump Driver premature wear - redesigned	54th-55th-56th	SC Vol. 30, No. 1, p. 4
Rear Oil Pump Driver premature wear - redesigned	54th-55th-56th	STB 56T-9, Dealer 7
Selector Lever Stops no stops - wrong lever	55th-56th	SC Vol. 29, No. 12, p. 66
Service Bushings parts available for service	All Models	SC Vol. 28 No. 12, p. 70
Service Bushings and Bearings parts list	23rd-56th	SSB No. 355, p. 6
Service Bushing Tools description and illustration of use	All Models	SC Vol. 28 No. 12, p. 65
Service Transmissions - Stripped shipped less bell housing	54th-55th	SC Vol. 29, No. 7, p. 37
Shift Pattern operating information	55th	STB 55T-6, Dealer 5
Shift Pattern, Earlier upshift modification	5640-60	SC Vol. 30, No. 7, p. 27
Throttle Control Rod bent - length data	24th-55th	SC Vol. 29, No. 4, p. 26
Throttle Control Rod Adjustment bent - rod length data	24th-55th	SSB No. 340, p. 7
Throttle Control Rod Adjustment supplemental rod length data	56th	SSB No. 344, p. 4
Throttle Control Shaft Lever Extension Kit, Carburetor unwanted kickdown - revised geometry	55th	SC Vol. 29, No. 7, p. 36
Throttle Control Shaft Lever Extension, Carburetor application extended to early 56th	55th-56th	SC Vol. 29, No. 12, p. 65
Throttle Linkage, Adjusting (Accelerator) shift point	56th	SC Vol. 30, No. 5, p. 18
Throttle Linkage Adjustment Training Book correction	55th	SC Vol. 29, No. 6, p. 34
Throttle Linkage Adjustment (Caribbean Carburetors) new model information	5588	SC Vol. 29, No. 6, p. 32
Throttle Linkage Adjustments supplement - corrections/variations	54th-55th-56th	SSB No. 340, p. 7
Torque Specification Change universal joint flange bolt	55th	SC Vol. 29, No. 8, p. 41
Torque-Tightening Controls stuck valves - fluid/pressure leaks	All Ultramatic	SC Vol. 30, No. 9, p. 35
Torquing Valve Body Bolts erratic pressure readings	Twin Ultramatic	SC Vol. 29, No. 4, p. 24
Transmission - Caribbean replacement - important differences	5588	SC Vol. 29, No. 9, p. 45
Transmission Replacement - Caribbean important differences	5588	STB 55T-20, Dealer 17
Universal Joint Flange Bolt click, loosening - new type	54th-55th	STB 55T-4, Dealer 4
Universal Joint Flange Bolt click, loosening - new type	54th-55th	SC Vol. 29, No. 9, p. 46
Valve Springs and Spacer - Caribbean production change - new type	5588	STB 55T-26 (Zones only)

- ELECTRICAL -

Subject	Models	Reference
Auto-Lite Generators production substitution - identification	56th	SC Vol. 29, No. 12, p. 65
Battery, 12 Volt Characteristics new model information	55th	SC Vol. 29, No. 9, p. 44
Battery, 12 Volt Characteristics new model information	55th	STB 55T-3, Dealer 3
Battery - Negative Terminal Grounded polarizing generator	56th	STB 55T-49, Dealer 40
Batteries, Storage OE availability - alternate replacements	55th	STB 55T-15, Dealer 13
Directional Signal Switch not cancelling - sleeve position	55th	SC Vol. 29, No. 3, p. 22
Distributor Specifications Caribbean - revisions	5688	SC Vol. 30, No. 1, p. 4
Distributor Vacuum Control Assembly Delco - superseded	5560-80	SSB No. 350, p. 8
Electric Door Locks inoperative - disconnected wiring	56th	SC Vol. 30, No. 6, p. 24
Electric Window Lift Motor Kits superseded part, with modifications required	55th-56th	SSB No. 356, p. 5
Electric Window Lift Motor Kits incorrectly packaged	55th-56th	SSB No. 359, p. 5
Electric Window Shaft and Pinion loose - new, one-piece type	55th	SC Vol. 29, No. 8, p. 40
Headlights, New Style Sealed Beam improved design	All Models	SC Vol. 29, No. 8, p. 42
Horn Button Contact not closing - spacers added	55th	SC Vol. 29, No. 8, p. 42
Horn Ring Contact Plate Retainer ring misaligned - new design	56th	SC Vol. 30, No. 4, p. 16
Ignition Cable Support Brackets - Caribbean cables chafed - relocation	5588	STB 55T-25 (Zones only)
Ignition Cable Support Brackets cross-firing - new-type and wires	55th-56th	SC Vol. 30, No. 3, p. 9
Ignition Resistors burned points, misfiring - identification	55th-56th	SC Vol. 30, No. 2, p. 6
Ignition Timing production change	5680-88	SC Vol. 29, No. 12, p. 65
Ignition Timing, Incorrect excessive vacuum - inspection and adjustment	5540	STB 55T-39, Dealer 30
Power Seat Actuator Pin Tool fabrication and use	55th-56th	SC Vol. 30, No. 2, p. 8
Rear Cigar Lighters incorrect bases - replacement	5582-87	STB 55T-14, Dealer 12
Service Manual - Electrical Section (Correction) polarizing generator	55th	SC Vol. 29, No. 10, p. 54
Spark Plug Failures fouling - diagnosis	55th-56th	SC Vol. 30, No. 6, p. 22
Spark Plug Fouling cold - hotter plug available	55th	SC Vol. 29, No. 8, p. 41
Spark Plugs superseded part	55th-56th	SSB No. 355, p. 1
Starter Motor Pinion Adjustment excessive wear - correct procedure	56th	SC Vol. 30, No. 7, p. 27
Starter Solenoids, Delco water leaks - sealing	56th	SC Vol. 30, No. 4, p. 15
Tail Light Cable and Sockets service parts for harness	56th	SC Vol. 30, No. 8, p. 32
Trunk Compartment Light staying on - adjustment	56th	SC Vol. 30, No. 4, p. 16
Wiring Diagrams new model information	55th	SC Vol. 29, No. 1, p. 10A
Wiring Diagrams new model information	56th	SC Vol. 29, No. 13, p. 11

- ENGINE -

Subject	Models	Reference
Chrome Piston Rings excessive oil consumption - incorrect installation	55th-56th	SC Vol. 30, No. 2, p. 7
Combustion Test With Dual Exhaust preferred pickup connection point	55th	SC Vol. 29, No. 3, p. 22
Crankshaft Front Oil Seals leaking - new type	55th-56th	SC Vol. 30, No. 3, p. 12
Crankshaft Identification balance/usage	55th	SC Vol. 29, No. 5, p. 30
Crankshaft Identification correction	55th	SC Vol. 29, No. 8, p. 41
Crankshafts, Replacement superseded part - drop-forged	5560-80; 56th	SSB No. 350, p. 7
Cylinder and Piston Assembly installation with standard transmission	55th	SC Vol. 29, No. 8, p. 42
Cylinder Head Oil Passage noisy rockers levers - restricted	55th	STB 55T-5 (Zones only)
Cylinder Heads, Cast Dome production change - new specifications and adjustments and identification	5540	SC Vol. 29, No. 7, p. 35
Detonation insufficient octane - production change, Delco distributor conversion kits	56th	STB 56T-14, Dealer 11
Detonation Auto-Lite distributor conversion kits	5640-60-70	STB 56T-19, Dealer 16
Detonation - Supplement revised distributor mainshaft assembly	5680	STB 56T-17, Dealer 14
Engine and Parts 1955 stripped engine sale - will fit 1956	22nd-56th	SSB No. 350, p. 6
Engine Numbers Utica number location	55th	SC Vol. 29, No. 5, p. 29
Hydraulic Valve Lifter Checking Tool new type or modify and update	55th-56th	SC Vol. 30, No. 2, p. 6
Hydraulic Tappet Leak-Down noise after cold start - redesigned	55th	STB 55T-29 (Zones only)
Hydraulic Tappet Noise checks and corrections	55th	SC Vol. 30, No. 1, p. 3
Hydraulic Tappets - General Information noise - checks and corrections	55th-56th	SC Vol. 30, No. 8, p. 31
Hydraulic Tappets - Noisy at idle, 40-50MPH, hot - sticking relief valve	56th	SC Vol. 30, No. 3, p. 11
Hydraulic Valve Lifters superseded part	55th-56th	SSB No. 344, p. 2
Ignition Timing production change	5680-88	SC Vol. 29, No. 12, p. 65
Ignition Timing, Incorrect excessive vacuum - inspection and adjustment	5540	STB 55T-39, Dealer 30
Oil Consumption excessive - rocker levers shafts, intake oil deflectors, and piston rings	55th	STB 55T-19, Dealer 16
Oil Consumption - see also:	--	"Chrome Piston Rings" "Rocker Lever Shaft Holes" "Valve Spring Baffles"
Oil Drain Plug Gasket new nylon type	All Models	SC Vol. 30, No. 1, p. 4
Oil Filler Tube Baffle oil splash - redesigned tube	55th	SC Vol. 29, No. 7, p. 38
Oil Pump Relief Valve Tube Kit for Correction of Hydraulic Valve Tappet Letdown intermittent at idle, 40-60MPH, hot - relief valve, sump tube, pressure leaks/checks, new cam thrust plate/spacer	55th-56th	STB 56T-20, Dealer 17
Piston Pin Lock groove and wire size change	55th	SC Vol. 29, No. 8, p. 40
Piston Pin Locks supplemental usage	56th	SC Vol. 29, No. 12, p. 65
Rear Main Bearing Oil Leaks notching for drainage	55th	SC Vol. 29, No. 4, p. 26
Rocker Lever Identification right vs. left hand	55th	SC Vol. 29, No. 5, p. 28
Rocker Lever Shaft Holes - Oil Control oil consumption - holes eliminated	55th	STB 55T-16, Dealer 14
Rocker Lever Shaft Holes - New Shafts noisy - holes reinstated, smaller	55th	STB 55T-35, Dealer 26
Rough Engines reporting balancing numbers	55th	STB 55T-23 (Zones only)
Runaway/Flare - see:	--	"Twin Ultramatic"
Service Engine identification - wrong colors	55th	STB 55T-33, Dealer 24
Service Bulletin Correction see SSB No. 350, p. 6 - 352-cid part number	22nd-56th	SSB No. 351, p. 3
Service Manual Corrections - Engine Section bore/stroke specifications	55th	SC Vol. 29, No. 8, p. 41
Stall On Left Turns internal leak - vacuum passage bushing	5660	SC Vol. 30, No. 9, p. 36
Valve Spring Baffles oil consumption - new part	55th-56th	SC Vol. 30, No. 1, p. 1
Valve Spring Baffles (Part Number - Correction) rocker shaft bolt lockwasher	55th-56th	SC Vol. 30, No. 5, p. 20
Valve Spring Retainers spring seats - new harder type	55th-56th	SSB No. 325, p. 1
Valve Spring Seat, Intake retainer - new harder type	56th	SC Vol. 30, No. 7, p. 26
Valve Spring Tool description and use	55th	SC Vol. 29, No. 5, p. 28

- FENDERS & SHEET METAL -

Subject	Models	Reference
Headlamp Door Wind Whistle diagnosis - repair	5640-60	STB 55T-54, Dealer 45
Radiator Grille Emblem Base superseded part	5540-60	SC Vol. 30, No. 9, p. 36
Radiator Grille Noise whistling - baffles	5640-60	STB 56T-5, Dealer 4

- FRAME -

Subject	Models	Reference
Reinforcement and Modifications to Handle Trailers towing - hitches and lifts	55th	STB 55T-27, Dealer 20

- FUEL & EXHAUST -

Subject	Models	Reference
Air Cleaner Gasket, Carburetor - Carter WCFB 2232S correct installation	5540	SC Vol. 29, No. 4, p. 24
Air Cleaner, AC incorrect stud - missing wing nut	5540	SC Vol. 29, No. 9, p. 46
Air Cleaner, AC incorrect stud - missing wing nut	5540	STB 55T-24, Dealer 19
Carburetor, Carter 4-Barrel - Rough Idle secondary return spring tension	5660	SC Vol. 29, No. 12, p. 65
Carburetors (description and servicing):	--	--
- Caribbean (twin Rochester 4GC)	5588	SC Vol. 29, No. 6, p. 32
- Carter WCFB 2232S	5540	SC Vol. 29, No. 2, p. 11
- Carter WCFB 2394S	5660	SC Vol. 29, No. 10, p. 47
- Carter WGD 2393S	5640	SC Vol. 29, No. 10, p. 51
- Rochester 4GC	5560-80	SC Vol. 29, No. 2, p. 15
- Rochester 4GC	5680	SC Vol. 29, No. 10, p. 54
Carburetor Metering Rods - Jets - Repair Kits part numbers	55th	SC Vol. 29, No. 8, p. 39
Carburetor Metering Rods - Jets - Repair Kits part numbers	56th	SC Vol. 30, No. 8, p. 31
Carburetor Primary Venturi Brass Rings, Rochester loose, falling into intake - campaign	5697-99	STB 56T-23 (Zones only)
Carburetor Tools:	--	--
- Additions	56th	SC Vol. 29, No. 12, p. 66
- Carter WCFB 2232S	5540	SC Vol. 29, No. 3, p. 20
- Idle Mixture Adjusting Tool	5588	SC Vol. 29, No. 6, p. 33
- Rochester 4GC	5560-80	SC Vol. 29, No. 3, p. 20
Flat Spot or Hesitation - Rochester pump plunger deformed	5560-80	SC Vol. 29, No. 3, p. 21
Gasoline Fumes (Rochester) deceleration, right turns - return for rework	5560-80	STB 55T-41, Dealer 32
Gasoline Fumes, Rochester Carburetor supplement - new gasket, field modification	5560-80	SC Vol. 30, No. 2, p. 7
Gasoline Fumes (Termination Rochester Carburetor Correction) new gasket, field modification	5560-80	STB 56T-15, Dealer 12
Hesitation or Stumbling - Carter WGD-2393S revised pump plunger, jet/housing, and fast idle cam	5640	STB 56T-12, Dealer 9
Ignition Timing, Incorrect excessive vacuum - inspection and adjustment	5540	STB 55T-39, Dealer 30
Stall On Left Turns internal leak - vacuum passage bushing	5660	SC Vol. 30, No. 9, p. 36
Throttle Linkage Ball Joints falling off - service damage	55th-56th	SC Vol. 30, No. 3, p. 12

- INSTRUMENTS -

Subject	Models	Reference
Gauges, Erratic instruments fuse	55th	SC Vol. 29, No. 6, p. 34
Windshield Wipers:	--	--
Dual Speed Wipers malfunction/hissing - hoses reversed	55th	SC Vol. 29, No. 5, p. 30
Wiper Arms servicing	55th	SC Vol. 29, No. 4, p. 25
Wiper Arms/Blades unsatisfactory wiping - redesigned	56th	SC Vol. 30, No. 4, p. 15
Wiper Arms/Blades - Correction part numbers	56th	SC Vol. 30, No. 7, p. 27

- RADIATOR & COOLING -

Subject	Models	Reference
Radiator Inlet Hose Collapsing reinforcing spring missing - service part	55th-56th	SSB No. 331, p. 6
Radiator Inlet Hose Reinforcing Spring superseded part	55th-56th	SSB No. 337, p. 6
Water Pumps, Noisy growl - seal lubrication, use of rust inhibitor	55th-56th	SSB No. 340, p. 2

- REAR AXLE -

Subject	Models	Reference
Filler Plug Interference, Twin Traction carrier/case - rework end	56th	SSB No. 319, p. 6
Gear Tooth Pattern noise - pinion adjustment	56th	SC Vol. 30, No. 8, p. 30
Holding Adapter special tool	56th	SC Vol. 30, No. 2, p. 8
Pinion Depth Setting supplemental procedure	56th	SSB No. 330, p. 3
Pinion Nut, Drive (Torque Specifications - Additions) supplemental information	56th	SC Vol. 30, No. 8, p. 32
Pinion Rear Bearing and Sleeve, Differential identification	55th	SC Vol. 29, No. 9, p. 44
Rear Wheel Hub Clicks - All Models axle shafts - correcting taper	55th	SC Vol. 29, No. 9, p. 46
Twin Traction Differential, Servicing operating characteristics, pinion adjustment, service replacement units	56th	STB 56T-8, Dealer 6
Twin Traction Safety Differential preliminary information	56th	SC Vol. 30, No. 4, p. 13
Vibration Period 58-62 M.P.H. driveline angle - shimming axle, alternate ratio	5580; 5680	STB 56T-10, Dealer 8

- SUSPENSION & STEERING -

Subject	Models	Reference
Front Wheel Bearing Adjustment revised torquing procedure	All Models	SC Vol. 30, No. 3, p. 11
Front Wheel Bearing Adjustment (Correction) revised torquing procedure	All Models	SC Vol. 30, No. 5, p. 20
Front Wheel Bearing (Torque Specifications - Addition) revised torquing procedure	55th	SC Vol. 30, No. 8, p. 32
Hard Steering knuckle thrust bearing	55th	SC Vol. 29, No. 4, p. 24
Power Steering Cylinder Seal Kit, Bendix leaks - proper installation	55th-56th	SC Vol. 30, No. 8, p. 32
Power Steering Pump Pressure Gauge Fittings special tools	55th	SC Vol. 29, No. 6, p. 34
Power Steering Pump Reservoir Cap improved type - same number	55th-56th	SSB No. 319, p. 6
Power Steering Pump Reservoir Dip Stick breaks loose, cap leaks - discontinued, cap redesigned	55th	SC Vol. 29, No. 8, p. 41
Power Steering Pumps Bendix vs. Monroe - identification, do not interchange	55th	SC Vol. 29, No. 4, p. 24
Power Steering Recovery too slow - binding nylon spacer	55th-56th	SC Vol. 30, No. 2, p. 7
Power Steering, Binding (Bendix) ball stud adjustment	All Models	STB 55T-38, Dealer 29
Rear Shock Grommet Spacer squeaking - excessive end play	56th	SC Vol. 30, No. 5, p. 20
Shock Absorber Bracket, Rear Axle Torque Arm superseded part	55th	SSB No. 340, p. 4
Shock Absorbers - Export bottoming - heavy-duty type available	55th	STB 55T-42, Dealer 33
Stabilizer Bushing Retainer Clip Installer, J-4654 service procedure clarified	24th-56th	SC Vol. 25, No. 7 p. 25
Steering Cross Bars and Sockets Assemblies interchangeable parts	22nd-56th	SSB No. 348, p. 7
Steering Flange - Except Push Button Control superseded part	56th	SSB No. 355, p. 7
Steering Knuckle Bearing Shims, Front Wheel superseded parts	22nd-56th	SSB No. 348, p. 8
Steering Knuckle Supports superseded parts	22nd-56th	SSB No. 350, p. 7
Support Arm Bushing Torque Specifications, Front - Additions inner, upper and lower	55th	SC Vol. 29, No. 8, p. 41
Support Arm Pivot Pins and Bushings, Front rattles - revised part	55th	SC Vol. 29, No. 7, p. 36
Torque Specifications - Suspension Additions front support arm inner bushings, upper/lower	55th	SC Vol. 29, No. 8, p. 41
Torsion-Level Suspension:	--	--
- Cautions delivery and service	55th	STB 54T-19, Dealer 9
- Control Switch compensator - external shorts	56th	SC Vol. 30, No. 4, p. 14
- Control Switch compensator superseded, jumper harness required	55th	SC Vol. 30, No. 6, p. 22
- Control Switch compensator superseded, jumper harness required	55th	SSB No. 319, p. 6
- Control Switch jumper harness - wire connections	55th	SSB No. 324, p. 4
- Erratic Action loose support arm inner bushing nuts - compensator nuts	55th-56th	SSB No. 325, p. 5
- Limit Switch and Compensator Motor overtravel, excessive current draw - diagnosis, new limit switch	55th	STB 55T-2, Dealer 2
- Limit Switch Wiring Guard stone damage - fabrication	56th	SC Vol. 30, No. 2, p. 8
- Load Arm Ball Stud and Seats snapping noise - new type	56th	SC Vol. 30, No. 1, p. 4
- Load Arm Snap noise - ball studs/seats redesigned, alternate unloading procedure	55th	STB 55T-37, Dealer 28
- Load Compensator Lever Identification uneven riding height, side-to-side - visual inspection	55th	SC Vol. 29, No. 3, p. 22
- Load Compensator parts identification and assembly	55th	SC Vol. 29, No. 4, p. 23
- Load Compensator - Service Procedure testing - raise/lower with jumper wire	56th	SC Vol. 29, No. 12, p. 66
- Load Compensator - Testing Procedures raise/lower with jumper wire	55th	SC Vol. 29, No. 3, p. 21
- Long Torsion Bars, 9-degree bottoming - re-indexed hexes	5580; 5680-88	STB 56T-1 (Zones only)
- Long Torsion Bars (9-degree) replacements in pairs - jounce bumper clearance	55th-56th	SSB No. 320, p. 7
- Manual Control Kit bottoming on approach - driver override	56th	SC Vol. 30, No. 7, p. 28
- Rear Load Arm Links unseated - retaining pin added	55th	STB 55T-18 (Zones only)
- Solenoids inoperative - waterproofing	56th	STB 55T-50, Dealer 41
- Stop Light Switch removal - socket size	55th-56th	SSB No. 328, p. 5
- Switches Waterproofed shorts - replace and waterproof individual switches	55th	STB 55T-36, Dealer 27
- Uneven Riding Height side-to-side - diagnosis, replacement links	55th	STB 55T-1, Dealer 1
- Uneven Riding Height fore-to-aft - adjustment, dash switch wire no longer disconnected for shipping	56th	STB 55T-53, Dealer 44
- Wire Disconnected dash control switch - for shipping	55th	STB 55T-13, Dealer 11
- Worm Shaft Lock Ring motor turns, but not lowering - inspection and replacement	55th	STB 55T-12, Dealer 10

- UNIVERSAL JOINTS -

Subject	Models	Reference
Rear Cross Bearing Bolt Lockwashers incorrectly installed	55th	SC Vol. 29, No. 4, p. 26

- WHEELS & TIRES -

Subject	Models	Reference
Wheel Disc Plugs debris in wheel covers - new part	55th	SC Vol. 29, No. 9, p. 46

- BODY -

Subject	Models	Reference
Bumper Attachment, Universal special tool	All Models	SC Vol. 30, No. 6, p. 24
Bumper Impact Bar, Front - Lower superseded part	55th	SC Vol. 30, No. 6, p. 24
Bumper Support Arms, Rear superseded	55th	SSB No. 319, p. 6
Chrome Plate Protective Coating applied for shipping - safe removal	55th	STB 55T-31, Dealer 22
Door (and Window) Handle Retainer, Inside falling off - new type	55th	SC Vol. 29, No. 4, p. 25
Door Glass, Broken loose runway end	56th	SC Vol. 30, No. 9, p. 36
Door Lock Strikers Spacers misaligned - adjustment	56th	STB 56T-3, Dealer 2
Door (and Window) Handle Retainer, Inside falling off - revised part	55th-56th	SC Vol. 30, No. 5, p. 20
Dust Leaks in Trunk Compartment new wider tail lamp body gasket	5580	SC Vol. 29, No. 7, p. 37
Dust Leaks trunk compartment - locating	55th	SC Vol. 29, No. 9, p. 46
Instrument Panel Paint Schemes dealer installed A/C - color matching vents	55th	STB 55T-21, Dealer 18
Rear Fender Joint Moulding Cover- Painted now plain steel - do not strip	5540-60	SC Vol. 29, No. 3, p. 22
Rear Window Outside Trim Plates rust/tarnish from buffing residue - clean up	56th	STB 55T-51, Dealer 42
Seat Back Falls Forward, Caribbean inertia - ball stud and spring added	56th	SC Vol. 30, No. 5, p. 19
Seat Cushions and Seat Backs, Front - Early Production 56th Series Caribbean too firm - lower density foam available	5688	STB 56T-13, Dealer 10
Stained Headlining stitching bleed-through - new type insulation	5540-60	STB 55T-30, Dealer 21
Stained Headlining supplement - alternate adhesive	5540-60	STB 55T-44, Dealer 35
Tail Lamp Lens Distortion heat lamp abuse	All Models	SC Vol. 30, No. 9, p. 34
Trunk Lid Lock new model - servicing	5680	SC Vol. 29, No. 12, p. 61
Trunk Lock latch - superseded part	56th	SSB No. 350, p. 8
Trunk Lock Plate unlatching - new part, adjustment	56th	SC Vol. 30, No. 4, p. 15
Weatherstrip, Door Roof Rail - Hard-Tops water leaks, wind noise - supplemental part	56th	SC Vol. 30, No. 9, p. 33
Weatherstrip, Hinge Type (door roof rail) service springs/striker - 55th assemblies superseded	55th-56th	SSB No. 331, p. 6
Weatherstrip, Windshield Pillar Post new type	55th	SC Vol. 29, No. 8, p. 40
Window Regulator Assembly electric - with arm and bracket	55th-56th	SSB No. 320, p. 7
Window Regulator Assembly electric - group number correction	5522-5622	SSB No. 322, p. 3
Windshield Glass Squeaks creeps out of weatherstrip - use of sealant	55th	SC Vol. 29, No. 8, p. 42
Windshield Moulding Upper Cover Joint broken stud - new type, same number	56th	SC Vol. 30, No. 4, p. 16
Windshield Weatherstrip and Moulding Retainers glass drops out at top - install lower retainers	55th	STB 55T-10, Dealer 9
Windshield Weatherstrip Retainer glass drops out at top with revised weatherstrip - alternate lower retainers	55th	STB 55T-34, Dealer 25

- LUBRICATION -

Subject	Models	Reference
Lubrication Charts new model information	55th	SC Vol. 29, No. 1, p. 9
Lubrication Charts new model information	56th	SC Vol. 29, No. 13, p. 9
Transmission Fluid Ultramatic - proper type	55th	SC Vol. 29, No. 8, p. 41
Transmission Fluid - Correction Ultramatic - proper type	55th	SC Vol. 29, No. 10, p. 54

- SPECIFICATIONS -

Subject	Models	Reference
Caribbean Carburetors supplemental information	5588	SC Vol. 29, No. 6, p. 32
Distributor Specifications Caribbean - revisions	5688	SC Vol. 30, No. 1, p. 4
Front Wheel Bearing Adjustment revised torquing procedure	All Models	SC Vol. 30, No. 3, p. 11
Front Wheel Bearing Adjustment (Correction) revised torquing procedure	All Models	SC Vol. 30, No. 5, p. 20
Ignition Timing production change	5680-88	SC Vol. 29, No. 12, p. 65
Mechanical Specifications and Adjustments new model information	55th	SC Vol. 29, No. 1, p. 1
Mechanical Specifications and Adjustments new model information	56th	SC Vol. 29, No. 13, p. 1
Mechanical Specification Changes (Cast Dome Cylinder Heads) distributor, carburetor, spark plugs	5540	SC Vol. 29, No. 7, p. 35
Torque Specification Change (Twin Ultramatic) universal joint flange bolt	55th	SC Vol. 29, No. 8, p. 41
Torque Specifications new model information	55th	STB 55T-8, Dealer 7
Torque Specifications - Additions front support arm inner bushings, upper/lower	55th	SC Vol. 29, No. 8, p. 41
Torque Specifications - Additions front wheel bearing and 56th rear axle pinion	55th-56th	SC Vol. 30, No. 8, p. 32

Sources For Additional Information While the price of single original copies of these publications makes it costly to obtain them all, reprints are available at affordable prices from independent sources. In 1982, all issues of the Service Counselor from 1951-56 were reprinted by one of the other Packard clubs, in volumes by calendar year, but with all issues from 1955-56 bound as a single volume. Additional volumes for previous years have been added in recent years, and a 1999 revision cataloged the 1956 articles in a new, extended index. However, unlike the original factory publications (where pages were typically numbered consecutively and effective with the first issue through the end of a given year/volume), the pages in the revision for 1955-56 have been completely renumbered, but starting with these new index pages, which are located at the front. Furthermore, all volume and issue number information has been eliminated from the front page of each edition. While some of those changes do aid in locating information within that particular version, the removal of original information runs counter to the reference information as cited in the index provided here. As such, you will need to access to document in their full original and unedited format. Thankfully, many original Service Counselors have been scanned and are now available online from The Packard Library -- an independent undertaking. Except for Vol. 30, No. 9, all issues from 1955-56 are now available on their Service Letters / Counselors page. Reprints of the Service Technical Bulletins for 1955-56 are available as a single set and priced at $40.00 (USD) from: John F. Shireman 220 Mt. Pleasant Avenue Jersey Shore, PA 17740 Please add $5.00 (USD) for postage and handling. Payment accepted via United States Postal Money Order only. Reprints for previous years may also be available; contact Mr. Shireman for details. However, know that there are fifteen STBs in the subject time frame that were never intended for the eyes of any Packard dealer, but sent only to the two dozen (or so) Zone Offices across the country -- for discreet handling by field service managers and representatives

55T-5	55T-11	55T-18	55T-22	55T-23
55T-25	55T-26	55T-28	55T-29	56T-1
56T-6	56T-11	56T-23	56T-24	56T-25

While these "Zone only" issues are referenced in this index, they are NOT included in the above offerings and are very hard to come by. Reprints of Studebaker Service Bulletins are available from: Richard Quinn 20026 Wolf Rd. Mokena, Il 60448 e-mail: rtq11@aol.com Contact Mr. Quinn directly for pricing of reprints of the specific articles and payment details, but because this is a time consuming proposition, you should expect to pay a fair price for his time as well as materials and shipping. Exceptions Last but not least, I took the liberty of omitting some articles from this index that were published in 1955-56, but involve previous series and/or have no relevance to servicing 55th-56th Series. However, I added several relevant topics that were published prior to the start of the 1955 calendar year:

Subject	Reference
Buzzing Noise in Reverse - "Tips From The Editor" - Twin Ultramatic	SC Vol. 28 No. 12, p. 70
Direct Drive Clutch Slippage - Gear Start Ultramatic Transmissions	SC Vol. 28 No. 10, p. 58
Hydraulic Tests - Twin Ultramatic	SC Vol. 28 No. 11, p. 62
Service Bushing Tools - All Ultramatic	SC Vol. 28 No. 12, p. 65
Service Bushings - All Ultramatic	SC Vol. 28 No. 12, p. 70
Stabilizer Bushing Retainer Clip Installer, J-4654	SC Vol. 25, No. 7 p. 25
Torsion Level Suspension - Cautions - 55th Series	STB 54T-19, Dealer 9

Most of these were included in this index simply because the 55th Series cars actually debuted late in the 1954 calendar year, but some topics involve technologies that carried over from previous Series. While these additional topics are NOT included in the reprint offerings cited above, it may be helpful for you to review this information, but I don't specifically recommend that anyone purchase sets of reprints for an entire previous year just to get these few. Epilogue Although I've been collecting and reviewing bulletin information for decades, any time that I thought I might be finished, another piece of the puzzle always seemed to turn up. At some point, I may expand the scope of this index to include entries for other types of factory bulletins that have a bearing on service. As such, revisions to this online document may be forthcoming. So, don't forget to check back! Again, because this index was compiled from documents published by the factory, neither the author nor The Packard V8 Club are responsible for errors in content arising from source information, but you may direct questions and comments to the webmaster -- for forwarding and follow-up as time permits.