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 MANUALSCHEVROLET1987SUBURBAN R20, 7.4 N, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)DRIVELINES & AXLESDIFFERENTIALS & DRIVE AXLESDRIVE AXLE - FULL FLOATINGOVERHAULINSPECTION
1987 Chevrolet Suburban R20, 7.4 N, 400/M40
Drive Axle - Full Floating: Overhaul: Inspection
1987 Chevrolet Suburban R20, 7.4 N, 400/M40SECTION Inspection
- Use cleaning solvent to rinse gears and bearings. Check large end of bearing rollers where wear, if any, is evident. Check pinion and flange splines for excessive wear. Ensure ring gear teeth are in good condition.
- Check differential case for cracks, scoring of side gears, thrust washers and pinion thrust faces. Check fit of side gears to case and to axle shaft splines. Look at pinion shaft and spacer for scoring or excessive wear.
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.