K 1500 Truck 4WD V8-379 6.2L DSL VIN C FI (1992)
Valve Body: Customer Interest
A/T - High Line Pressure Instability 4L80E/4L80EHD
Number:
92-66-7A
Section:
7A
Date:
DEC. 1991
Corporate Bulletin No.: 177128
ASE No.: A2
Subject:
HIGH LINE PRESSURE INSTABILITY
Model and Year:
1991-92 C/K, R/V, P, G MODELS WITH 4L80-E/4L80-EHD
TRANSMISSION APPLICATIONS:
SUBJECT:
1991-92 HYDRA-MATIC
High Line Pressure Instability
4L80-E/4L80-EHD
(New Spacer Plates and
Gaskets) Service Information
TRANSMISSION MODELS:
VEHICLE APPLICATIONS:
All Models
C/K, R/V, and P - Trucks
G - Van
(This bulletin is in conjunction with Dealer Service Bulletin No. 91-348-7a, dated June 1991.)
Condition:
Some HYDRA-MATIC 4L80-E/4L80-EHD transmissions may experience high line pressure instability
Cause:
This instablity is caused by the Pressure Regulator valve spring combination.
Correction:
New Spacer Plates and Gaskets were released to correct the instability.
Production Date:
Starting August 21, 1991 (Julian Date 233) all HYDRA-MATIC 4L80-E/4L80-EHD transmissions were built with the new spacer plate and gaskets
Part
Description
Year/Model Application
8683973
Pkg-Case Sub-Asm (Overseas)
1992 RAP*, RBP*
8683974
Pkg-Case Sub Asm (2WD)
1991 ABP, ADP, BAP, BBP,
BMP, BNP, CAP, CBP,
CRP, DCP, DDP, DNP,
DPP, DRP, DSP
1992
ABP, BAP, BMP, BNP,
DCP, DRP, DNP, DPP,
HTP, LLP, JDP
Part #
Description
Year
Model Application
8683975
Pkg-Case Sub Asm (4WD)
1991
ACP, BJR CKP, DLP
1992
ACP, BJP, DLP, LFP