Chevrolet Silverado / GMC Sierra. Service manual — part 1474

For the 8.6 inch axle, assemble the J 21777-35 (1), the J 21777-43 (2), the J 21777-42
(3), and the J 21777-29 (4) as shown.

For the 9.5/9.5LD inch axles, assemble the J 21777-8 (1), the J 21777-43 (2), the J
21777-42 (3), and the J 45108 (4) as shown. See Special Tools.

For the 11.5 inch axle, assemble the J 44416-3 (1,4), the J 21777-43 (2), and the J
44416-2 (3) as shown.

4. While holding the J 21777-43 stationary, install an inch-pound torque wrench on the nut of

the J 21777-43 and tighten the nut until a rotating torque of 1.7 N.m (15 lb in) is obtained.

Rotate the assembly several times in both directions in order to seat the pinion bearings.

5. Check the rotating torque of the assembly. If the torque is less than 1.7 N.m (15 lb in),

tighten the nut on the J 21777-43 until a rotating torque of 1.7-2.3 N.m (15-20 lb in) is
obtained.

2008 Chevrolet Silverado 1500

2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 254: Assembling Special Tools In Differential Carrier Bore
Courtesy of GENERAL MOTORS CORP.

6. Assemble the following components into the differential carrier bore of the axle housing:

For the 8.6 inch axle, assemble the J 21777-45 (1, 2) to the J 21777-1 (3) as shown.

For the 9.5/9.5LD inch axles, assemble the J 21777-86 (1, 2) to the J 21777-1 (3) as
shown.

For the 11.5 inch axle, assemble the J 44416-1 (1, 2) to the J 21777-1 (3) as shown.

7. Install the bearing caps.

2008 Chevrolet Silverado 1500

2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

8. Install the bearing cap bolts.

Tighten: Tighten the bearing cap bolts to 75 N.m (55 lb ft).

9. Rotate the J 21777-1 within the J 21777-45, 8.6 inch axle, or the J 21777-86, 9.5/9.5LD

inch axles, or the J 44416-1, 11.5 inch axle. The J 21777-1 must rotate back and forth freely
within the discs. If the J 21777-1 does not rotate freely, disassemble the components, inspect
for proper seating and/or mis-aligned components and re-assemble.

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 255: J 21777-1 & J 44416-3
Courtesy of GENERAL MOTORS CORP.

10. Align the plunger of the J 21777-1 (1) to the 8.5 inch gage block setting of the J 21777-29,

8.6 inch axle, or the J 45108 , 9. See Special Tools.5/9.5LD inch axles, or the J 44416-3,
11.5 inch axle (2).

2008 Chevrolet Silverado 1500

2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado