Removal & Installation
- Raise the vehicle.
- Remove the engine protection shield.
- Drain the drive axle.
- Remove the front propeller shaft.
- Remove the rear steering gear crossmember.
Measure the torque required in order to rotate the pinion. Use an inch-pound torque wrench. Record the torque value for reassembly. This will give the combined preload for the following components:
The pinion bearings
Scribe an alignment line between the pinion shaft and the pinion yoke.
Install J 8614-01 tool and remove pinion nut.
- Install the J 8614-2 and the J 8614-3 into the J 8614-1 as shown in graphic.
Remove the pinion yoke by turning the J 8614-3 clockwise while holding the J 8614-01.
- Remove the oil seal using a suitable seal removal tool.
- Remove the dust deflector from the pinion yoke using a soft-faced hammer.
- Install the new deflector onto the pinion yoke using a soft-faced hammer.
- Lubricate seal lip and yoke.
- Install new pinion seal with approved seal driver.
- Apply sealant GM P/N 12346004 or equivalent to the splines of the drive pinion yoke.
- Install pinion yoke.
- Align the reference marks made during removal.
- Seat the pinion yoke onto the pinion shaft by tapping it with a soft-faced hammer until a few pinion shaft threads show through the yoke.
- Install the washer and a new pinion nut.
- Install the J 8614-1 onto the pinion yoke.
Tighten the pinion nut while holding the J 8614-01.
- Tighten the pinion nut until the pinion end play is just taken up. Rotate the pinion while tightening the nut to seat the bearings.
Measure the rotating torque of the pinion using an inch-pound torque wrench.
NOTECompare the measurement of the rotating torque to the measurement recorded earlier. The rotating torque of the pinion nut should be 3-5 inch. lbs. (0.40-0.57 Nm) greater than the torque recorded during removal.
- If the rotating torque is not within specifications, continue to tighten the pinion nut.
- Tighten the pinion nut, in small increments, as needed, until the torque required in order to rotate the pinion is 3-5 inch. lbs. (0.40-0.57 Nm) greater than the torque recorded during removal.
- Once the specified torque is obtained, rotate the pinion several times to ensure the bearings have seated. Recheck the rotating torque and adjust if necessary.
- Install the rear steering gear crossmember.
- Install the front propeller shaft.
- Install the engine protection shield.
- Fill the drive axle.
- Lower the vehicle.