Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1983SUBURBAN C20, 5.7 M, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSOVERHAUL - THM 400TRANSMISSION DISASSEMBLYREAR UNIT END PLAY CHECK
1983 Chevrolet Suburban C20, 5.7 M, Standard
Rear Unit End Play Check
1983 Chevrolet Suburban C20, 5.7 M, StandardSECTION Rear Unit End Play Check
- 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 |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.