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 MANUALSCHEVROLET1990S10/T10 P/U 4WD V6-262 4.3LREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINDIFFERENTIAL ASSEMBLYSERVICE AND REPAIRUNIT REPAIRFRONT AXLEASSEMBLY OF THE AXLEGEAR TOOTH CONTACT PATTERN CHECKTEST
1990 Chevrolet S10/T10 P/U 4WD V6-262 4.3L
Test
1990 Chevrolet S10/T10 P/U 4WD V6-262 4.3LSECTION Test
1. Wipe oil out of axle housing and carefully clean each tooth of the ring gear.
2. Apply gear marking compound sparingly to all ring gear teeth using a medium stiff brush.
3. Apply a load until a torque of 54-68 Nm (40-50 ft. lbs.) is required to turn the pinion.
A test made without loading the gears will not give a satisfactory pattern. Turn the companion flange with a wrench so that the ring. gear rotates one full revolution. Then reverse the rotation so that the ring gear rotates one revolution in the opposite direction. Excessive turning of the ring gear is not recommended.
4. Observe the pattern on the ring gear teeth and compare with the images shown.
2. Apply gear marking compound sparingly to all ring gear teeth using a medium stiff brush.
3. Apply a load until a torque of 54-68 Nm (40-50 ft. lbs.) is required to turn the pinion.
A test made without loading the gears will not give a satisfactory pattern. Turn the companion flange with a wrench so that the ring. gear rotates one full revolution. Then reverse the rotation so that the ring gear rotates one revolution in the opposite direction. Excessive turning of the ring gear is not recommended.
4. Observe the pattern on the ring gear teeth and compare with the images shown.
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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.