C 30 P/U 2WD V8-379 6.2L DSL (1985)
Band Apply Servo: Technical Service Bulletins
A/T - Servo Cover Retainer Ring Modified
85-78
7A
APR., 1985
Subject:
SERVO COVER RETAINER RING INFORMATION
Model and Year:
SOME 1985 THM 200-C, 200-4R TRANSMISSIONS
TO:
ALL CHEVROLET DEALERS
FIGURE 1 SERVO COVER RETAINING RING
FIGURE 2 INTERMEDIATE SERVO BORE
During the 1985 model year, a new style servo cover retaining ring (with tangs) is scheduled to go into production on THM 200-C, 200-4R
Transmissions (Refer to Figure 1.) In addition to the new style retaining ring, the notches on the case intermediate servo bore, used for access of
retaining ring removal, were omitted (Refer to Figure 2.)
These changes will provide easier removal and installation of the servo cover retaining ring, as well as prevent damage to the servo cover and piston
seals during assembly.
The past style servo cover retaining ring part number 8628137 (without tangs), can be used with the past style (with notches) case intermediate servo
bore. The new servo cover retaining ring part number 8657213 (with tangs), can be used with either style case intermediate servo bore.
