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 MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINAUTOMATIC TRANSMISSION/TRANSAXLESERVICE AND REPAIROVERHAULMANUAL SHAFT
1990 Chevrolet Lumina APV V6-191 3.1L
Manual Shaft
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Manual Shaft
1. Check manual valve rod, retainer and detent lever for damage.
2. Check manual shaft and retainer for damaged threads and the flats for raised edges. File down any raised edges.
3. Check parking lock actuator rod for damage or broken retainer lugs. Check parking lock actuator spring for damage.
4. Install parking lock actuator rod into manual shaft lever. The manual shaft and detent lever assembly are made as a matched set. Replace as a matched set.
5. Install manual shaft and parking lock actuator rod into case and push through driven sprocket support. Install manual valve rod into manual detent lever.
6. Install detent lever onto manual shaft with hub side away from driven sprocket support, Fig. 68. Push manual lever into place.
7. Install detent lever and hub assembly to manual shaft retaining pin, Fig. 18.
8. Install manual shaft to case nail.
2. Check manual shaft and retainer for damaged threads and the flats for raised edges. File down any raised edges.
3. Check parking lock actuator rod for damage or broken retainer lugs. Check parking lock actuator spring for damage.
4. Install parking lock actuator rod into manual shaft lever. The manual shaft and detent lever assembly are made as a matched set. Replace as a matched set.
5. Install manual shaft and parking lock actuator rod into case and push through driven sprocket support. Install manual valve rod into manual detent lever.
Fig. 68, Installing detent lever & manual shaft:
6. Install detent lever onto manual shaft with hub side away from driven sprocket support, Fig. 68. Push manual lever into place.
Fig. 18, Removing manual shaft pin:
7. Install detent lever and hub assembly to manual shaft retaining pin, Fig. 18.
8. Install manual shaft to case nail.
RENDER: 1.0x
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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.