Acclaim L4-153 2.5L SOHC (1990)
Technical Service Bulletin # 210990A
Date: 900409
A-604 A/T - Clutch Slippage or Shift Bump
Models
AA, AC, AG, AJ, AS, & AY Bodies
Subject
A-604 Transaxle OD/REV Clutch Slippage or Transaxle Shift Bump "Stop Bump"
Index
TRANSMISSION
Date
April 9, 1990
No.
21-09-90 REVISION A (C21-05-0)
P-1045
BODY CODE LEGEND
AA - ACCLAIM/SPIRIT/LEBARON
AC - DYNASTY/NEW YORKER/SALON
AG - DAYTONA
AJ
- LEBARON COUPE/LEBARON CONVERTIBLE
AS - CARAVAN/GRAND CARAVAN/CARAVAN C/V
VOYAGER/GRAND VOYAGER/TOWN & COUNTRY
AY -
IMPERIAL/NEW YORKER FIFTH AVENUE
THIS BULLETIN SUPERSEDES TECHNICAL, SERVICE BULLETIN # 21-09- 90, WHICH SHOULD BE REMOVED FROM YOUR FILE. THIS
REVISION INCLUDES ADDITIONAL DIAGNOSTIC STEPS AND INSPECTION PROCEDURES.
Discussion
Some 1989 and 1990 A-604 Ultradrive Transaxles may exhibit one or more of the following symptoms:
^
No reverse.
^
No 3rd or 4th gear.
^
Slips during a 2-3 upshift. These symptoms may be the result of a cut input clutch hub or overdrive/reverse (OD,/REV) piston outer lip seals,
a loose or missing 0D/REV piston orifice, or excessive OD/REV piston casting thickness.
^
Transaxle shift bump ("Stop Bump") after the vehicle has come to a complete stop. The bump condition feels similar to a harsh shift
engagement and is most likely to occur after the transaxle has warmed up. This symptom may be the result of a poor finish on the low/reverse
clutch piston retainer.
When performing diagnostic or a reconditioning operation on the A-604 Transaxle, the following items must be performed to ensure you have correctly
diagnosed and repaired the transaxle.
Diagnosis/Inspection
Proper diagnostic and inspection procedures must be followed when evaluating a suspect transaxle OD/REV clutch system failure and/or a low/reverse
clutch piston retainer defect.
^
Check the fluid level and condition. Discolored or burnt fluid is an indication of transaxle overheating.
^
Connect the DRB II and perform the diagnostic tests as outlined in the appropriate Powertrain Diagnostic Procedure Manual. Be sure you
complete the Shift Lever Test and the Clutch Test on 1990 models.
^
Record fault codes and clutch volumes.
