Factory Service Index - Packard Motor Car Information

An Index to Service Information for 1955-56 (55th->56th Series) Packards

1955-56 (55th->56th Series) - TWIN ULTRAMATIC

MAIN SERVICE INDEX -> 1955-56 (55TH->56TH SERIES) -> TWIN ULTRAMATIC

Subject	Application	Document
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)
Bearings, Care of Ball and Roller installation/removal damage - proper support	(all models)	SC Vol. 20, No. 8
Bell Housing Oil Seal leaks - superseded part, use of prelube	56th; 56J	SSB No. 351, p. 4
Bell Housing Oil Seal leather leaks - use neoprene	23rd-24th; (25th-55th)	SC Vol. 25, No. 8, p. 31
Bell Housing Oil Seal Leaks converter mis-alignment - checks	23rd-24th; (25th-56th)	SC Vol. 25, No. 10, p. 40
Breather fluid leaking - check level, relocate	56th	SC Vol. 30, No. 9, p. 34
Bushing Tools, Service description and illustration of use	23rd-55th	SC Vol. 28, No. 12, p. 65
Bushings and Bearings, Service part number reference	23rd-56th	SSB No. 355, p. 6
Bushings, Service part number reference	23rd-55th	SC Vol. 28, No. 12, p. 70
Buzzing Noise in Reverse pump check valve binding - rework	55th	SC Vol. 28, No. 12, p. 70
Changes in... (Confidential) production - with part, effective date/unit	55th	STB 55T-11 (Zones only)
Changes in... (Confidential) production - with part, effective date/unit	56th	STB 56T-6 (Zones only)
Changes in... production - with part, effective date/unit	55th	STB 55T-22 (Zones only)
Control Valve: Assemblies, Complete identification - not interchangeable	55th-56th	SSB No. 358, p. 6
Control Valve: Changes to Improve Shift Pattern update to 56th Series - new valving kits	54th-55th	SC Vol. 30, No. 8, p. 29
Control Valve: Torque-Tightening Controls stuck valves - fluid/pressure leaks	23rd-56th	SC Vol. 30, No. 9, p. 35
Control Valve: Torquing Valve Body Bolts erratic pressure readings	55th	SC Vol. 29, No. 4, p. 24
Control Valve: Valve Springs and Spacer - Caribbean production change - new type	5588	STB 55T-26 (Zones only)
Converter: Fluid Leaks damaged washers - use of sealant	23rd-56th; 56J	SSB No. 350, p. 1
Converter: Pump Shaft - Oil Pump Rotor Splines - see also: Front Oil Pump	--	--
Converter: 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
Converter: Pump Shaft - Oil Pump Rotor Splines - Worn or Stripped new 40-spline service parts	54th-55th-56th	SC Vol. 30, No. 3, p. 10
Converter: Pump Shaft and Oil Pump Rotor worn/stripped splines - corrections, superseded parts	54th-55th-56th; 56J	SSB No. 331, p. 4
Converter: Reaction Clutch Sprags premature failure - replace in sets	54th-55th-56th; 56J	SSB No. 348, p. 3
Converter: Reaction Clutch Sprags replacement - use of reaction clutch assembly	54th-55th-56th; 56J	SSB No. 358, p. 7
Converter: Reactor End Play new measuring method and special tool	55th	SC Vol. 29, No. 3, p. 21
Converter: Reactor End Play revisions to checking method and special tool	56th	STB 55T-52, Dealer 43
Converter: Reactor Shaft Bushing Clearance direct drive failure - excessive clearance	23rd-24th; (25th-55th)	SC Vol. 25, No. 8, p. 31
Converter: Torque (Reactor End Play) improved end play control, elimination of wave washer - assembly superseded, identification	56th; 56J	SSB No. 331, p. 6
Converter: Torque (Reactor End Play) wave washer kit cancelled	56th; 56J	SSB No. 339, p. 4
Direct Drive Clutch: Engagement shift valve piston and spring	55th	SC Vol. 29, No. 2, p. 18
Direct Drive Clutch: Engagement slipping - new high speed governor spring	55th	SC Vol. 29, No. 9, p. 45
Direct Drive Clutch: Engagement slipping and shift points	55th	STB 55T-7, Dealer 6
Direct Drive Clutch: Engagement, Loss of input/crankshaft end play, bushing position, restricted fluid passages - modifications	55th	SSB No. 320, p. 4
Direct Drive Clutch: Piston Ring Installation, Converter improper/slow engagement - check ring gap	55th-56th; 56J	SSB No. 358, p. 6
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
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 - 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 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 - 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...Upshift loss of pressure, bushing wear - pressure tests	54th-55th-56th; 56J	SSB No. 339, p. 5
Fluid, Transmission - Correction fluid identification number	55th	SC Vol. 29, No. 10, p. 54
Fluid, Transmission improved type - anti-friction qualities, cold-weather perfomance	55th	SC Vol. 29, No. 8, p. 41
Front Oil Pump - see also: Converter Pump Shaft	--	--
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
Gearshift Indicator Pointer misalignment - new clamp	55th	SC Vol. 29, No. 7, p. 37
High Range Clutch: (failures) operating precautions	56th; (54th-55th)	SC Vol. 30, No. 4, p. 16
High Range Clutch: Burning high range clutch spring and piston	55th-56th; 56J	SSB No. 327, p. 8
High Range Clutch: Burning spring data correction	55th-56th; 56J	SSB No. 338, p. 3
High Range Clutch: Driving Plate new heavy-duty type - installation procedure	55th-56th; 56J	SSB No. 344, p. 2
High Range Clutch: Housing - Part Nos. 458950 and 6484046 clearance checks - grind welds	55th-56th; 56J	SSB No. 359, p. 6
High Range Clutch: Housing - Part Nos. 458950 and 6484046 damaged seal, insufficient chamfer - return for exchange	55th-56th; 56J	SSB No. 346, p. 4
High Range Clutch: Housing Identification differentiation - check end play as installed	55th-56th; 56J	SSB No. 346, p. 4
High Range Clutch: Problems load pick up and slippage - checks, adjustments, and service precautions	55th-56th	SSB No. 320, p. 5
Hydraulic Tests preliminary service information	55th	SC Vol. 28, No. 11, p. 62
Leaks - see also: Bell Housing Oil Seal Breather Converter Oil Loss	--	--
Linkage Adjustments - see also: Throttle Control Rod Throttle Linkage Throttle Valve Lever	--	--
Low Range Brake: Cap distorted - designed shape	56th	SC Vol. 30, No. 5, p. 20
Low Range Brake: Functions Improperly distorted cap	55th	SC Vol. 29, No. 9, p. 45
Low Range Brake: Functions Improperly distorted cap	55th	STB 55T-17, Dealer 15
Low Range Brake: Information harsh, noisy, runaway/flare - correct springs, new separator plate	56th	STB 56T-18, Dealer 15
Low Range Operation high range clutch failure - proper use of low range	23rd-25th; (26th-56th)	SC Vol. 25, No. 14, p. 67
Low Range Operation high range failure - proper use	23rd-25th; (26th-56th)	STB 51T-39, Dealer 34
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	(56th); 56J	SSB No. 319, p. 5
Oil Loss at Breather level, restrictions, overheating - relocation	23rd-56th; 56J	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 control lever set screw relocated - rod shortened	55th	SC Vol. 30, No. 1, p. 4
Parking Lock Sticking manual valve modification - new parking gear	55th	SC Vol. 29, No. 7, p. 36
Pressure Test Plug, (Front) Pump production change - fabricate test adapter	55th	SC Vol. 29, No. 3, p. 20
Push Button Control: (actuator-to-manual shaft set screw) superseded part	56th	SSB No. 350, p. 8
Push Button Control: (malfunctions) checks, adjustments, and precautions	56th	SSB No. 327, p. 6
Push Button Control: Actuator Shaft (set) Screw accessibility - new Allen head design	56th	SC Vol. 30, No. 7, p. 27
Push Button Control: Adjusting Actuator-to-Transmission Control Valve Detent loss/delay of high range - special procedure	56th	SSB No. 338, p. 3
Push Button Control: Armature Test special methods	56th	STB 56T-26, Dealer 20
Push Button Control: Bent Actuator Fingers overtravel - straightening	56th	SC Vol. 30, No. 3, p. 12
Push Button Control: Circuit Breaker superseded part - modification	56th	SSB No. 351, p. 3
Push Button Control: Inoperative overtravel, finger damage - rework contact segment	56th	SSB No. 322, p. 4
Push Button Control: Left-Side Conversion driver accessibility issues	56th	SC Vol. 30, No. 6, p. 23
Push Button Control: Light Leak at control buttons - felt mask	56th	SC Vol. 30, No. 1, p. 3
Push Button Control: Pressure Switch water leak/shorts - relocation	56th	SC Vol. 30, No. 2, p. 8
Push Button Control: Push Button Type Control preliminary information/service	56th	SC Vol. 29, No. 11, p. 55
Push Button Control: Relay Water Trough water leak/shorts	56th	SC Vol. 30, No. 1, p. 3
Push Button Control: Removal of Automatic Park Relay pawl damage	56th	STB 56T-25 (Zones only)
Push Button Control: Removal of Control Relay redundant part	56th	SC Vol. 30, No. 1, p. 2
Push Button Control: Retaining Clip (Switch Actuator) new service part	56th	SSB No. 324, p. 4
Push Button Control: Supplement Automatic Park Relay added	56th	SC Vol. 29, No. 12, p. 62
Push Button Control: Towing Instructions precautions	56th	STB 55T-46, Dealer 37
Push Button Control: Towing, Road Testing and (CORRECTED) precautions	56th	STB 56T-4C, Dealer 3
Push Button Control: Towing, Road Testing and precautions	56th	STB 56T-4, Dealer 3
Push Button Control: Vent actuator - condensation and oil	56th	SSB No. 322, p. 4
Push Button Control: Water in Actuator leaks at wires	56th	SC Vol. 30, No. 6, p. 22
Rattle (converter) loose direct drive pressure plate screws - replace and/or retorque	55th; (56th)	STB 55T-40, Dealer 31
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
Rear Oil Pump Rotor Sets cost savings - new kits	54th-55th-56th	SC Vol. 30, No. 3, p. 11
Selector Lever Stops no stops - wrong lever	55th-56th	SC Vol. 29, No. 12, p. 66
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 Adjustment (Caribbean Carburetors) new model information	5588	SC Vol. 29, No. 6, p. 32
Throttle Linkage Adjustment Training Book correction	55th	SC Vol. 29, No. 6, p. 34
Throttle Linkage Adjustments supplement - corrections/variations	54th-55th-56th	SSB No. 340, p. 7
Throttle Linkage, Adjusting (Accelerator) shift point	56th	SC Vol. 30, No. 5, p. 18
Torque Specification Change universal joint flange bolt	55th	SC Vol. 29, No. 8, p. 41
Transmission - Caribbean replacement - important differences	5588	SC Vol. 29, No. 9, p. 45
Transmission Replacement - Caribbean important differences	5588	STB 55T-20, Dealer 17
Transmissions, Service - Stripped shipped less bell housing	54th-55th	SC Vol. 29, No. 7, p. 37
Universal Joint Flange Bolt click, loosening - new type	54th-55th	SC Vol. 29, No. 9, p. 46
Universal Joint Flange Bolt click, loosening - new type	54th-55th	STB 55T-4, Dealer 4

SC = Service Counselor

SL = Service Letter

STB = Service Technical Bulletin

SSB = Studebaker Service Bulletin

NOTE: These PDFs were created from High Quality Scans. It is recommended that you Right Click on the link(s) above and do a "Save Target As". This will download the PDF to your machine rather than trying to open and view it over the web.

Disclosures & Disclaimers

Though previously published elsewhere, this work is provided with my full permission for display on the PackardInfo.com website and the personal use of visitors to that site. Any other unauthorized use, however, is expressly prohibited and may be subject to prosecution. Also, because this index was compiled from documents published by the factory, neither the author nor PackardInfo.com are responsible for errors in content arising from source information.

	';
Happy Thanksgiving and welcome to Packard Motor Car Information! If you're new here, please register for a free account.