Tools Required
• | J 22388 Pinion Oil
Seal Installer - Rear |
• | J 33782 Pinion Oil
Seal Installer |
• | J 38694 Extension Housing
Oil Pump/Seal Installer |
Removal Procedure
Important: Observe and mark the positions of all the driveline components relative to the
propeller shaft and the axles prior to disassembly. These components include the
propeller shafts, drive axles, pinion flanges, output shafts, etc. Assemble all
the components in the exact places in which you removed the parts. Follow any specifications,
torque values, and measurements obtained prior to disassembly.
- Raise the vehicle. Refer to
Lifting and Jacking the Vehicle
in General Information.
- Remove the tire and wheel assemblies. Refer to
Tire and Wheel Removal and Installation
in Tires and Wheels.
- Remove the rear brake calipers, if equipped. Refer to
Rear Brake Caliper Replacement
in Disc Brakes.
- Remove the brake rotors, if equipped. Refer to
Rear Brake Rotor Replacement
in Disc Brakes.
- Remove the brake drums, if equipped. Refer to
Brake Drum Replacement
in Drum Brakes.
- Disconnect the propeller shaft from the drive pinion yoke. Refer to
One-Piece Propeller Shaft Replacement
or
Two-Piece Propeller Shaft Replacement
in Propeller Shaft.
Position and secure the propeller shaft away from the rear axle.
- Measure the amount of torque required to
rotate the pinion using an inch-pound torque wrench. This will give the combined preload
for the following components:
- Record the measurement.
- Draw an alignment mark between the pinion
stem and the pinion flange/yoke.
- Install the J 8614-01
as shown.
- Remove the pinion nut while holding the J 8614-01
.
- Remove the washer.
- Install the J 8614-2 (2)
and the J 8614-3 (3) into the J 8614-01
(1) as shown.
- Remove the pinion yoke by turning the J 8614-3 (3)
clockwise while holding the J 8614-01
(1).
Use a container in order to retrieve the lubricant.
Important: Do not damage the axle housing sealing surface.
- Remove the pinion oil seal using a suitable seal removal tool.
Installation Procedure
- Install the new pinion oil seal using one
of the following:
• | For vehicles with a 7.6 inch axle, 2-Door Utilities and
4WD Pickups w/ RPO M50 and w/o RPO ZR2, use the J 33782
. |
• | For 2-Door Utilities and 4WD Pickups w/ RPO ZR2, use the J 22388
(1st design 8.6 inch
axle) or the J 38694
(2nd design
8.6 inch axle). |
- Apply sealant, GM P/N 12346004 (Canadian P/N 10953480)
or equivalent, to the splines of the pinion flange/yoke.
Important: Install the pinion gear flange/yoke to the pinion gear shaft in the same position
as marked during removal in order to maintain correct driveline balance.
- Install the pinion yoke.
Align the marks made during removal.
Notice: Do not hammer the pinion flange/yoke onto the pinion shaft. Pinion components
may be damaged if the pinion flange/yoke is hammered onto the pinion shaft.
- Seat the pinion flange/yoke onto the pinion shaft by tapping it
with a soft-faced hammer until a few pinion shaft threads show through the flange/yoke.
- Install the washer and a new pinion nut.
- Install the J 8614-01
onto the pinion flange/yoke as shown.
Notice: Refer to Fastener Notice in the Preface section.
Important: If the rotating torque is exceeded, the pinion will have to be removed and a
new collapsible spacer installed.
- Tighten the pinion nut while holding the J 8614-01
.
Tighten
Tighten the nut until the pinion end play is removed. Rotate the pinion while
tightening the nut to seat the bearings.
- Measure the rotating torque of the pinion.
Compare this measurement with the rotating torque recorded during removal.
Tighten
Tighten the nut in small increments, as needed, until the rotating torque is
0.40-0.57 N·m (3-5 lb in) greater than the
rotating torque recorded during removal.
- Once the specified torque is obtained, rotate the pinion several times
to ensure the bearings have seated. Check the rotating torque and adjust if necessary.
- Install the propeller shaft to the drive pinion flange/yoke. Refer to
One-Piece Propeller Shaft Replacement
or
Two-Piece Propeller Shaft Replacement
in Propeller Shaft.
- Install the brake drums, if equipped. Refer to
Brake Drum Replacement
in Drum Brakes.
- Install the brake rotors, if equipped. Refer to
Rear Brake Rotor Replacement
in Disc Brakes.
- Install the brake calipers, if equipped. Refer to
Rear Brake Caliper Replacement
in Disc Brakes.
- Install the tire and wheel assemblies. Refer to
Tire and Wheel Removal and Installation
in Tires and Wheels.
- Inspect and add axle lubricant to the axle housing, if necessary. Refer
to
Rear Axle Lubricant Level Inspection
.
- Lower the vehicle.