S10/T10 P/U 2WD L4-121 2.0L VIN Y 2-bbl (1983)
Output Shaft: Technical Service Bulletins
A/T- THM 700-R4 New Output Shafts and Seal
Number: 91-390-7A
Section: 7A
Date: AUGUST 1991
Corporate Bulletin No.: 177118
Subject:
NEW OUTPUT SHAFTS AND INPUT HOUSING TO OUTPUT SHAFT SEAL
Model and Year:
1982-91 CAPRICE, CAMARO AND CORVETTE, 1982-91 C1/C2, G1/G2, K1/K2, S/T; 1987-91 R/V; 1985-91 M AND 1990-91
L TRUCKS WITH 4L60/THM 700-R4 AUTOMATIC TRANSMISSION
TRANSMISSION APPLICATIONS:
1982-91 HYDRA-MATIC 4L60 (MD8) THM 700-R4
SUBJECT:
New Output Shafts and Input Housing to Output Shaft Seal (Product Service Information)
TRANSMISSION MODELS:
All
VEHICLE APPLICATIONS:
B, F, Y - Cars
C/K, R/V, S/T - Trucks
G, L, M - Vans
Figure 1
Bulletin Covers:
HYDRA-MATIC 4L60 output shafts and input housing to output shaft seals have been revised to provide increased lube flow. Since lube hole locations
have changed, the input housing to output shaft seal has been revised to accommodate them.
Date of Production Change:
Beginning January 28, 1991 (Julian Date 028), all HYDRA-MATIC 4L60 transmissions were built using the new output shafts and seals.