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 MANUALSCHEVROLET1990G 20 VAN V8-350 5.7LREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLESERVICE AND REPAIROVERHAUL4L60/4L60-E (700-R4) AUTOMATIC TRANSMISSIONSUBASSEMBLY SERVICE & TRANSAXLE ASSEMBLECASE & INTERNAL COMPONENTSINPUT CARRIER & SUN GEAR
1990 Chevrolet G 20 Van V8-350 5.7L
Input Carrier & Sun Gear
1990 Chevrolet G 20 Van V8-350 5.7LSECTION Input Carrier & Sun Gear
1. Inspect input carrier assembly for pinion gear damage, improper pin stake or worn or damaged thrust bearing.
2. Inspect input carrier assembly for excessive pinion washer wear. Endplay should not exceed 0.008-0.024 inch.
3. Inspect thrust washers for wear or damage.
4. Inspect input sun gear for bushing damage or wear, cracks and damaged spline or gear teeth.
5. Install input carrier assembly onto output shaft.
6. Install retainer ring into output shaft ring groove. Do not reuse old retainer ring if it has been overexpanded.
7. Remove output shaft support fixture tool No. J-29837 or equivalent, from case, then install thrust washer onto input carrier assembly.
8. Install input sun gear into input carrier.
2. Inspect input carrier assembly for excessive pinion washer wear. Endplay should not exceed 0.008-0.024 inch.
3. Inspect thrust washers for wear or damage.
4. Inspect input sun gear for bushing damage or wear, cracks and damaged spline or gear teeth.
5. Install input carrier assembly onto output shaft.
6. Install retainer ring into output shaft ring groove. Do not reuse old retainer ring if it has been overexpanded.
7. Remove output shaft support fixture tool No. J-29837 or equivalent, from case, then install thrust washer onto input carrier assembly.
8. Install input sun gear into input carrier.
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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.