On-Vehicle Service; Rear Axle Assembly Replacement (All Axles); Semi-Floating Axle (8 1/2- And 9 1/2-Inch Ring Gear); Axle Shaft, Oil Seal And Bearing Replacement - GMC G Service Manual

The following rear axle procedures apply to vehicles
equipped with rear drum brakes. However, if the model to
be serviced has rear disc brakes, refer to HYDRAULIC
FOUNDATION BRAKES (SEC. 5A2) for the appropriate
brake-related procedures.
REAR AXLE ASSEMBLY
REPLACEMENT (ALL AXLES)
H
Remove or Disconnect
• Raise the vehicle on a hoist and support the axle
assembly with a suitable lifting device.
• For 9 3/4-inch ring gear and 10 1 /2-inch ring gear
axles, raise the vehicle and place jack stands under
the frame side rails for support.
• Drain the lubricant from the axle housing.
1. Propeller shaft. Refer to PROPELLER SHAFT
(SEC. 4A).
2. Wheel and tire assembly.
3. Brake drum or hub and drum.
4. Parking brake cable from the lever and at the brake
flange plate.
5. Hydraulic brake lines from the connectors.
6. Shock absorbers from the axle brackets.
7. Vent hose from the axle vent fitting (if equipped).
8. Height-sensing and brake proportioning valve linkage
(if equipped).
9. Stabilizer shaft (if equipped).
• Support the assembly with a hydraulic floor jack.
10. Nuts and washers from the U-bolts.
11. U-bolts, spring plates and spacers from the axle
assembly.
• Lower the jack and the axle assembly.
B Install or Connect
1. Axle assembly under the vehicle.
• Align the axle assembly with the springs.
(8 1/2- AND 9 1/2-INCH RING GEAR)
AXLE SHAFT, OIL SEAL AND
BEARING REPLACEMENT
Remove or Disconnect (Figures 6
B
through 13)
Tools Required.
J 2619-01 Slide Hammer with Adapter

ON-VEHICLE SERVICE

SEMI-FLOATING AXLE
REAR AXLE 4B1-9
2. Spacers, spring plates and U-bolts to the axle
assembly.
• Raise the axle assembly.
3. Washers and nuts to the U-bolts.
• Thread the nuts on firmly.
• Adjust alignment of axle.
4. Stabilizer shaft (if equipped).
5. Height-sensing and brake proportioning valve linkage
(if equipped).
6. Vent hose to the axle vent fitting (if equipped).
7. Shock absorbers to the axle brackets.
8. Hydraulic brake lines to the connectors.
9. Parking brake cable to the lever and the flange plate.
10. Wheel and tire assembly.
11. Brake drum or hub and drum.
12. Propeller shaft. Refer to PROPELLER SHAFT
(SEC. 4A).
NOTICE: See " Notice" on page 4B1-1 of this
section.
I ^ l Tighten
• All fasteners. Refer to "Specifications" at the end of
this section.
] Important
• Check axle lubricant level at the filler plug hole. Lubri­
cate as needed. Refer to MAINTENANCE AND
LUBRICATION (SEC. OB).
• Bleed the brake system, check operation and adjust if
necessary. Refer to HYDRAULIC BRAKES
(SEC. 5A).
• Check axle and brake operation.
• Check for fluid leaks and road test the vehicle.
J 23689 Axle Shaft Bearing Remover (8 1/2-
J 29712 Axle Shaft Bearing Remover
(9 1/2'inch rin9 gear)
# Raise the vehicle on a hoist.
# Clean dirt from around the carrier cover.