A/T - Slips in Reverse or No Reverse

89pontiac26

Bulletin Number: 90-7-17
Reference Number: 977149
Publish Date: 12/89
Subject: SLIPS IN REVERSE AND/OR NO REVERSE (LO-REVERSE PISTON SNAP RING LOCATION INFORMATION)

Models

Affected: 1989-90 ALL MODELS WITH 3T40/125C TRANSMISSION

Figure 1:

BULLETIN COVERS:

Incorrectly installed Lo-Reverse Piston Snap Rings (657) that may cause a Slip in Reverse and/or no Reverse condition.

SERVICE PROCEDURE: Refer to Figure 1

Whenever installing the Lo-Reverse Clutch piston snap ring (657) the step on the outside diameter of the snap ring must be positioned toward the Lo-Reverse Clutch retainer (656). The retainer must rest inside the snap ring to allow proper piston travel.

If the snap ring is installed backwards with the step facing the splines on the hub, the retainer may limit travel of the piston and may result in a durability concern.