G 2500 3/4 Ton Van V6-262 4.3L VIN Z (1992)
Torque Converter Clutch: All Technical Service Bulletins
PROM - TCC Growl Noise 4L80-E/4L80-Ehd
GMC NUMBER:
92-7A-106
GROUP:
7A Automatic Transmission
DATE:
July 1992
CORPORATE NUMBER:
277127R
SUBJECT:
TORQUE CONVERTER CLUTCH GROWL NOISE (INSTALL NEW MEM-CAL PROM)
MODELS:
1991-92 "G" VAN WITH 4L8O-E/4L80-EHD TRANSMISSION
CONDITION
Some 1992 HYDRA-MATIC 4L80-E/4L80-EHD transmissions may experience a Torque Converier Clutch growl noise.
CAUSE
This is caused by too low of a vehicle speed for Torque Converter Clutch release.
CORRECTION
A new Mem-Cal Prom was released that raises the Torque Converter Clutch release point.
Date of Production: (Figure 1)
Starting April 1, 1992 (Julian Date 091) all 1992 MKP HYDRA-MATIC 4L80-E/4L80-EHD models were built with the new Mem-Cal and TCM.
SERVICE PARTS INFORMATION
Parts are currently available. In case of limited inventory, parts will be placed on 400 control to waive VIP surcharges. Only verifiable emergency VIP
orders will be accepted. GMSPO will make every effort to obtain parts. However, the part will be shipped premium transportation at dealer's expense
and all other order types will be placed on backorder until the 400 control is removed.
WARRANTY INFORMATION
For vehicles repaired under warranty use:
Labor Operation:
T0500