Rear Unit End Play Check
WARNING: This page does not describe the selected car, but rather 124 other vehicles, including the 1991 Chevrolet Pickup, 1991 Chevrolet Cab & Chassis, 1988 GMC Vandura Special, 1988 GMC Vandura, and 1988 GMC Value Van. However, it is still accessible from the selected car via links, so may be relevant.
- Transmission must be out of vehicle and extension housing must be removed. Install Speedometer Puller Bolt (J-21797) in an extension housing bolt hole. Install dial indicator.
- Zero dial indicator, move output shaft in and out, and note end play. See Fig 1. End play should be .007-.019" (.18-.48 mm). If not within specification, change thrust washer.
- Thrust washer controlling rear unit end play has 3 tabs. It is located between output shaft thrust washer and rear face of transmission case. Notches and/or numerals on tabs of washer identify thickness. See REAR UNIT THRUST WASHERS .
REAR UNIT THRUST WASHERS
| Washer Thickness | I.D. Notches | I.D. Numeral |
|---|---|---|
| .074-.078" | None | 1 |
| .082-.086" | Side 1 Tab | 2 |
| .090-.094" | Side 2 Tabs | 3 |
| .098-.102" | End 1 Tab | 4 |
| .106-.110" | End 2 Tabs | 5 |
| .114-.118" | End 3 Tabs | 6 |