Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
Valve Body: All Technical Service Bulletins
A/T - Evaluating Peened Spacer Plates
GMC NUMBER: 91-7A-141
GROUP: 7A Automatic Transmission
DATE: August, 1991
CORPORATE NUMBER: 177120
SUBJECT:
EVALUATING PEENED SPACER PLATES - ALL AUTOMATIC TRANSMISSIONS
MODELS:
1982-1991 ALL TRUCKS WITH HYDRA-MATIC AUTOMATIC TRANSMISSIONS
Figure 1
Some spacer plate peening is considered acceptable and preferred because it can help seat the check-ball. This bulletin will help you decide if a spacer
plate needs to be replaced due to a peening condition.
Service Procedure:
The following two procedures can help determine if the spacer plate can be reused. The following must be performed at all check-ball locations.
1. The spacer plate must be inspected 100% for raised material on the opposite side of the check-ball seat (see figure 1). If the material on the opposite
side is raised, the peening is too severe and the spacer plate must be replaced.
