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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 780 (REAR DRIVE AXLE)REPAIR INSTRUCTIONSDRIVE PINION SHIM SELECTION
1999 GMC Forward Control 5.7 R, Automatic
Drive Pinion Shim Selection
1999 GMC Forward Control 5.7 R, AutomaticSECTION Drive Pinion Shim Selection
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Tools Required
- J 42168-1 Differential Centerline Cylinder. See Special Tools and Equipment .
- J 42168-2 Shim Gage Assembly. See Special Tools and Equipment .
- J 42168-9 Holding Strap. See Special Tools and Equipment .
- J 42168-11 Pinion Housing Centering Spacer. See Special Tools and Equipment .
- J 42173 Differential Holding Fixture. See Special Tools and Equipment .
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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.