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 REPAIROVERHAULDRIVEN SPROCKET SUPPORT
1990 Chevrolet Lumina APV V6-191 3.1L
Driven Sprocket Support
1990 Chevrolet Lumina APV V6-191 3.1LSECTION Driven Sprocket Support
1. Check driven sprocket support for cracks or other damage. Check driven sprocket support sleeve for damage. It must be tight in its bore and align with holes in the support.
2. Check support bushing for damage or wear.
3. Check driven sprocket bearing assembly for damage. If replacement is necessary, proceed as follows:
a. Remove bearing using bearing puller tool No. J-26941 and a slide hammer, Fig. 67.
b. Install new bearing using bearing installer tool No. J-28677 and No. J-8092. Bearing must be installed with manufacturing identification facing up.
4. Check seal rings for nicks or cuts. When replacing the driven sprocket bearing assembly, the race on the driven sprocket must be checked. If necessary to replace the race, the driven sprocket assembly must be replaced. Do not remove seal rings unless replacing.
5. If removed, install new seal rings on sprocket support, Fig. 59.
6. Install direct clutch to support thrust washer and retain with petroleum jelly. Install driven sprocket support into case, Fig. 20.
2. Check support bushing for damage or wear.
3. Check driven sprocket bearing assembly for damage. If replacement is necessary, proceed as follows:
Fig. 67, Removing driven sprocket bearings:
a. Remove bearing using bearing puller tool No. J-26941 and a slide hammer, Fig. 67.
b. Install new bearing using bearing installer tool No. J-28677 and No. J-8092. Bearing must be installed with manufacturing identification facing up.
4. Check seal rings for nicks or cuts. When replacing the driven sprocket bearing assembly, the race on the driven sprocket must be checked. If necessary to replace the race, the driven sprocket assembly must be replaced. Do not remove seal rings unless replacing.
Fig. 59, Oil seal ring installation:
5. If removed, install new seal rings on sprocket support, Fig. 59.
Fig. 20, Removing driven sprocket support:
6. Install direct clutch to support thrust washer and retain with petroleum jelly. Install driven sprocket support into case, Fig. 20.
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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.