- Before servicing the vehicle, refer to the Precautions section.
- Remove the wheels.
- Remove the rear calipers and rotors.
- remove the driveshaft from the pinion flange. Matchmark the driveshaft prior to removal.
Using an inch lb. torque wrench, measure the amount of torque required to rotate the pinion. Record the measurement for assembly as this will give the combined preload for the following components:
- Place an alignment mark between the pinion and the yoke.
- Install holding tool J 8614-01 as shown.
- Remove the pinion nut while holding the holding tool.
- Remove the washer.
- Install tool J 8614-3 (2), J 8614-2 (3) into the holding tool (1) as illustrated.
- Remove the pinion yoke by turning tool J 8614-3 clockwise while holding tool J 8614-01. Use a pan to catch any fluid that leaks.
- Using a suitable tool, remove the seal being careful not to damage the housing.
- Examine the seal surface of pinion flange for tool marks, nicks or damage, such as a groove worn by the seal. If damaged, replace flange.
- Examine the carrier bore and remove any burrs that might cause leaks around the O.D. of the seal.
- Apply GM seal lubricant 1050169 to the outside diameter of the pinion flange and sealing lip of new seal.
Install or connect the following:
New pinion oil seal using a seal installer tool such as J 33782 for the 8 inch axle or tool J 38694 for the 8.6 inch axle.
- Measure the torque necessary to turn the pinion and compare this to the reading taken during removal. Tighten the nut additionally, as necessary to achieve the same preload as measured earlier. The rotating torque should be 3-5 inch lbs. (0.40-0.57 nm).
- Install the driveshaft assembly to the pinion flange.
The original matchmarks MUST be aligned to assure proper shaft balance and prevent vibration.
- Install the rotors and calipers.
- Install the wheels
If fluid was lost from the differential housing during this procedure, be sure to check and add additional fluid, as necessary.