G 20 Van V6-262 4.3L VIN Z (1993)
Torque Converter: Customer Interest
Torque Converter - Squeak Noise
Number: 93-114A-7A
Section: 7A
Date: MARCH 1993
Corporate Bulletin No.: 377111R
ASE No.: A2
Subject:
TORQUE CONVERTER SQUEAKS
Model and Year:
1991-93 C/K, R/V AND P TRUCKS, G VAN
WITH 4L80-E/4L80-EHD AUTOMATIC TRANSMISSION
THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO. 93-114-7A, DATED FEB. 1993. THE YEAR HAS BEEN
CORRECTED UNDER SERVICE PARTS INFORMATION. ALL COPIES OF 93-114-7A SHOULD BE DISCARDED.
CONDITION:
Some HYDRA-MATIC 4L80-E/4L80-EHD Transmissions may exhibit a torque converter squeak noise. The noise is noticeable at idle in park, neutral
and park/neutral at engine shut-off or during coastdown, with a light load. The noise goes away when the vehicle is in drive or reverse at idle with the
brakes applied.
CAUSE:
High spring load in the stator assembly of torque converter.
CORRECTION:
New converter assembly with a lower spring load in the stator assembly will significantly reduce any noise.
DATE OF PRODUCTION: (Figure 1)
Starting January 11, 1993 (Julian Date 011) all 1993 HYDRA-MATIC 4L80-E/4L80-EHD models will have the new converter assembly.
