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 MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 44 (REAR DRIVE AXLE)REPAIR INSTRUCTIONSGEAR TOOTH CONTACT PATTERN INSPECTIONTESTING PROCEDURE
2008 Pontiac Grand Prix Base
Testing Procedure
2008 Pontiac Grand Prix BaseSECTION Testing Procedure
WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
- Wipe clean the differential case, the ring gear and the axle housing of lubricant. Carefully clean each tooth of the ring gear.
- Use a medium stiff brush in order to sparingly apply gear marking compound, GM P/N 1052351 (Canadian P/N 10953497) or equivalent, to all of the ring gear teeth.
- Torque the bearing caps bolts to specification.
- Apply the park brake until a torque load of 14 N.m (10 lb ft) is required in order to turn the pinion.
- Using a wrench, turn the drive pinion flange/yoke so that the ring gear rotates 3 full revolutions.
- Turn the drive pinion flange/yoke in the opposite direction so that the ring gear rotates 3 full revolutions in the opposite direction.
- Observe the pattern on the ring gear teeth. Compare the pattern with the following illustrations.
IMPORTANT:
Performing a test without loading the gears will not produce a satisfactory pattern.
IMPORTANT:
Avoid turning the ring gear excessively.
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.