G 20 Van V8-379 6.2L DSL VIN C FI (1992)
PROM - Programmable Read Only Memory: Customer Interest
PROM - Torque Converter Clutch Growl Noise
Number: 92-239-7A
Section: 7A
Date: JULY 1992
Corporate Bulletin No.: 277127R
ASE No.: A2
Subject:
TORQUE CONVERTER CLUTCH GROWL NOISE
Model and Year:
1991-92 G VAN WITH 4L80-E/4L80EHD AUTOMATIC TRANSMISSION
TRANSMISSION APPLICATIONS:
1991 & 1992 HYDRA-MATIC 4L80-E/4L80-EHD (MT1)
TRANSMISSION MODELS:
1991 CAP, 1992 MKP
SUBJECT:
Growl Noise TCC Release (New Mem-Cal Prom/E-Prom)
VEHICLE APPLICATIONS:
6.2 Diesel G-Van
Condition:
Some 1992 HYDRA-MATIC 4L80-E/4L80-EHD transmissions may experience a Torque Converter 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.
Parts Information
Labor Code and Time:
T0500
G-Van .5
Parts are currently available from GMSPO.
