G 3500 1 Ton Van V8-379 6.2L DSL VIN J FI (1992)
Valve Body: Technical Service Bulletins
A/T - High Line Pressure Instability
GMC NUMBER:
92-7A-36
GROUP:
7A Automatic Transmission
DATE:
January 1992
CORPORATE
NUMBER:
177128
SUBJECT:
HIGH LINE PRESSURE INSTABILITY (NEW SPACER PLATES AND GASKETS)
MODELS:
1991-92 C/K AND R/V/P/G MODELS WITH 4L80-E/4L80-EHD
THIS BULLETIN IS IN CONJUNCTION WITH CORPORATE BULLETIN # 177110R, GMC TRUCK BULLETIN 91-7A-116, PUBLISHED
AUGUST 1991.
Some HYDRA-MATIC 4L80-E/4L80-EHD transmissions may experience high line pressure instability caused by the pressure regulator valve spring
combination.
New spacer plates and gaskets were released to correct the instability. Refer to the appropriate service manual section for proper replacement procedures.
SERVICE PARTS INFORMATION:
