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 MANUALSCHEVROLET1983SPORTVAN G10, 5.7 LREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSOVERHAUL - THM 400COMPONENT DISASSEMBLY & REASSEMBLYGEAR UNITREASSEMBLY (COMPLETE GEAR ASSEMBLY)
1983 Chevrolet Sportvan G10, 5.7 L
Reassembly (Complete Gear Assembly)
1983 Chevrolet Sportvan G10, 5.7 LSECTION Reassembly (Complete Gear Assembly)
- Install thrust bearing-to-sun gear race, thrust bearing, and thrust bearing-to-rear internal gear race on grooved end of mainshaft. Install mainshaft into rear internal gear. Install thrust bearing-to-sun gear race, bearing, and thrust bearing-to-output shaft on mainshaft.
- Install snap ring on mainshaft. Install mainshaft assembly to output shaft. Install snap ring and "O" ring seal. Install gear ring over output carrier. Install thrust washer into output carrier. Ensure tabs are in pockets. Lubricate pinion gears with transmission fluid and install reaction carrier into output carrier.
- Install sun gear, chamfered inside diameter first, into reaction carrier assembly. Install sun gear shaft with long splined end first. Install thrust bearing-to-center support race on sun gear shaft. Ensure flange is up against sun gear. Install needle thrust bearing. Install thrust bearing-to-center support races.
- Install thrust washer in recess of center support. Install reaction drum spacer and roller clutch assembly into reaction carrier. Install center support-to-reaction carrier thrust washer into recess in center support. Install center support into roller clutch in reaction carrier.NOTE: With reaction carrier held stationary, center support should rotate counterclockwise only.
- Install Holding Tool (J-21795-02) so tangs engage groove in mainshaft. Tighten set screw to prevent movement of roller clutch during installation of gear unit assembly. Remove gear unit from holding tool. Place unit on side and install output shaft-to-case metal thrust washer (bent tabs in pockets).
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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.