C 1500 Truck 2WD V8-350 5.7L (1989)
Clutch: All Technical Service Bulletins
A/T - Revised 3-4 Clutch
Number: 93-143-7A
Section: 7A
Date: MARCH 1993
Corporate Bulletin No.: 377117
ASE No.: A2
Subject:
TRANSMISSION UNIT REPAIR UPDATE 3-4 CLUTCH
Model and Year:
1987-93 CAPRICE, CAMARO AND CORVETTE
1987-93 G AND M VAN
1987-93 C/K, R/V AND S/T TRUCKS
1990-93 L VAN WITH 4L60 AND 4L60-E AUTOMATIC TRANSMISSION
SERVICE UPDATE
BULLETIN COVERS:
New Product Information for 1993 HYDRA-MATIC 4L60 and 4L60-E transmissions. This information has been updated since publication of the 1993
Service Manual and should be noted accordingly. Be certain to familiarize yourself with these updates to properly repair the 1993 HYDRA-MATIC
4L60 and 4L60-E transmissions.
DATE OF PRODUCTION CHANGE:
On January 05, 1993 (Julian Date 005) HYDRA-MATIC 4L60 and 4L60-E transmissions were built with an improved design 3-4 clutch. The improved
design consisted of combining the 3rd and 4th clutch ring retainer plate (III. 652), the 3rd and 4th clutch apply (stepped) plate (III. 653) and the 3rd and
4th clutch (steel) plate (III. 654C) into one 3rd and 4th clutch apply plate (III. 653) Figure 1. The 3rd and 4th clutch steel plates are also thicker and the
backing plate selection has changed as noted in Figure 2.
