R 3500 P/U 2WD V8-350 5.7L (1989)
Accumulator: Customer Interest
A/T - Harsh 1-2 Shifts
GMC NUMBER:
90-7A-63
GROUP:
7A Automatic Transmission
DATE:
May, 1990
CORPORATE
NUMBER:
077117
SUBJECT:
HARSH 1-2 SHIFTS - NEW VALVE BODY ASSEMBLY AND REAR ACCUM. SPRING
MODELS:
1989-90 C,K,R,VP TRUCKS AND G-VANS W/3L80 5.7L V8 TBI
BULLETIN COVERS:
Some HYDRA-MATIC 3L80 (THM 400) 5.7L V8 TBI models may experience a harsh 1-2 shift. A new Valve Body Assembly and Rear Accumulator
Spring were released which improve the 1-2 shift feel.
DATE OF PRODUCTION CHANGE:
(See Figure Below) Beginning December 21, 1989 (Julian Date 355) all LMA, LWA and SAA 1990 HYDRA-MATIC 3L80 (THM 400) transmission
models were built with the new Valve Body Assembly (49) and Rear Accumulator Spring (78).
SERVICE PARTS INFORMATION:
Important
BOTH PARTS MUST BE SERVICED TOGETHER. Parts are currently available from GMSPO.
SERVICE MANUAL REFERENCE:
Refer to the Unit Repair Section of the appropriate Service Manual for the proper replacement procedures.
WARRANTY INFORMATION:
For vehicles repaired under warranty use:
Labor Operation:
T8165
Labor Time:
1.3 hrs.
