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 MANUALSCHEVROLET1986G 20 VAN V8-379 6.2L DSLREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLESERVICE AND REPAIROVERHAUL700-R4 AUTOMATIC TRANSMISSIONSUBASSEMBLY SERVICECASE & INTERNAL COMPONENTS700-R4 TRANSMISSION
1986 Chevrolet G 20 Van V8-379 6.2L DSL
700-R4 Transmission
1986 Chevrolet G 20 Van V8-379 6.2L DSLSECTION 700-R4 Transmission
1. Remove retainer ring from input internal gear, then the reaction carrier shaft
from input internal gear.
2. Inspect reaction carrier shaft for the following:
a. Scored, damaged or worn bushing.
b. Cracked shaft.
c. Damaged spline or gear teeth.
d. Under cut around shaft from interference with sun gear.
3. Inspect input internal gear for cracks, damaged splines or damaged gear teeth.
4. Inspect input carrier to reaction shaft thrust bearing for wear or damage.
5. Inspect output shaft for the following:
a. Plugged or restricted lube passages.
b. Damaged splines or ring groove.
c. Damaged governor drive gear teeth.
d. Burrs or damage to front of shaft at seal area and gearing journals.
6. Install reaction shaft into input internal gear.
7. Install retainer ring into input internal gear.
8. Install internal gear and shaft assembly into the sun gear shell.
9. Install thrust bearing onto the reaction carrier shaft. Ensure outer race goes toward the reaction carrier shaft.
10. Install output shaft into transmission, then position output shaft support fixture tool No. J-29837 or equivalent, upwards as far as possible to support output shaft onto case.
from input internal gear.
2. Inspect reaction carrier shaft for the following:
a. Scored, damaged or worn bushing.
b. Cracked shaft.
c. Damaged spline or gear teeth.
d. Under cut around shaft from interference with sun gear.
3. Inspect input internal gear for cracks, damaged splines or damaged gear teeth.
4. Inspect input carrier to reaction shaft thrust bearing for wear or damage.
5. Inspect output shaft for the following:
a. Plugged or restricted lube passages.
b. Damaged splines or ring groove.
c. Damaged governor drive gear teeth.
d. Burrs or damage to front of shaft at seal area and gearing journals.
6. Install reaction shaft into input internal gear.
7. Install retainer ring into input internal gear.
8. Install internal gear and shaft assembly into the sun gear shell.
9. Install thrust bearing onto the reaction carrier shaft. Ensure outer race goes toward the reaction carrier shaft.
10. Install output shaft into transmission, then position output shaft support fixture tool No. J-29837 or equivalent, upwards as far as possible to support output shaft onto case.
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.