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 DISASSEMBLE

1999 GMC Forward Control 5.7 R, Automatic

Drive Pinion Disassemble

1999 GMC Forward Control 5.7 R, AutomaticSECTION Drive Pinion Disassemble

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 42162 Side Gear Compressor. See Special Tools and Equipment .
J 42164 Pinion Gear Holder. See Special Tools and Equipment .
J 42166 Front Pinion Bearing Remover. See Special Tools and Equipment .
J 42172 Bearing Race Installer/Spanner Wrench. See Special Tools and Equipment .

Fig 1: Removing/Installing Pinion Nut Using J 42172

Courtesy of GENERAL MOTORS CORP.

Remove the pinion nut using the J 42172 and the J 42164 . See Special Tools and Equipment .

Fig 2: Housing/Cage Pinion Shaft & Bearing

Courtesy of GENERAL MOTORS CORP.

Position the pinion housing/cage into a press.
Use the J 42162 and a hydraulic press in order to remove the pinion shaft and bearing from the housing/cage. See Special Tools and Equipment .

Fig 3: Nut, Bearing, Spacer & Pinion Shaft & Housing/Cage

Courtesy of GENERAL MOTORS CORP.

RENDER: 1.0x

NO RELATED

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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.