K 1500 Truck 4WD V6-262 4.3L (1991)
Output Shaft: Customer Interest
A/T - 4L80-E/4L80-EHD Grunt or Squawk Noise
Number: 91-387-7A
Section: 7A
Date: AUGUST 1991
Corporate Bulletin No.: 177117
Subject:
GRUNT OR SQUAWK NOISE
Model and Year:
199l C1 (SS-454 ONLY), AND G3 TRUCKS WITH 4L80-E/4L80-EHD AUTOMATIC TRANSMISSION
TRANSMISSION APPLICATIONS:
1991 HYDRA-MATIC 4L80-E/4L80-EHD (MT1)
SUBJECT:
Grunt or Squawk Noise Output Shaft (New Service Package)
TRANSMISSION MODELS:
ADP, BBP, CBP, DDP, DSP
VEHICLE APPLICATIONS:
C1 (SS-454 Only) Truck w/4L80-E and 7.4L Engine G313 Van w/4L80-E/4L80-EHD
Service Information:
Some HYDRA-MATIC 4L80-E/4L80-EHD transmissions may experience a grunt or squawk noise coming from the output shaft area. This noise is
caused by the propshaft moving back and forth on a non-lubricated transmission output shaft. A new Output Shaft Assembly was released which adds a
greased sleeve to lubricate the yoke to output shaft area and dampens the noise.
A new propshaft shaft assembly was released which has grease added to slip yoke splines, a vented welsh plug and slight increase in length.
New Models, which feature this grease sleeve, were released to replace current models:
Previous Models
New Models
AJP
ADP
BRP
BBP
CSP
CBP
HSP
DDP
HTP
DSP
