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Chevrolet Silverado / GMC Sierra. Manual - part 1491
gear cam unit in order to align the pinion gear shaft opening with the pinion shaft opening in
the differential case.
If the pinion shaft cannot be installed after pressing on the locking differential side gear cam
unit, replace the locking differential clutch disc gear thrust washer with a thinner washer.
5. Install the pinion shaft lock bolt.
Tighten: Tighten the pinion shaft lock bolt finger tight.
6. Rotate the pinion gear closest to the lock bolt so that one of the teeth is pointing downward,
perpendicular to the ring gear flange.
7. Install a brass drift between the locking differential side gear cam unit and the pinion shaft.
Press the brass drift in far enough in order to compress the clutch discs.
NOTE:
Refer to Fastener Notice .
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 285: Measuring Backlash Of Differential Pinion Gear & Side Gear
Courtesy of GENERAL MOTORS CORP.
8. Measure the backlash of the differential pinion gear and the locking differential side gear
cam unit by doing the following:
1. Install the J 7872 (1) to the ring gear flange. See Special Tools.
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
2. Loosely clamp the J 8001-3 (2) onto the stem on the J 7872 (1). See Special Tools.
3. Place the contact pad of the J 8001-3 on one of the teeth of the pinion gear closest to
the pinion shaft lock bolt. See Special Tools.
Turn the dial of the J 8001-3 until the needle and the dial face indicate ZERO. See
Special Tools.
4. Tighten the lock nut of the J 8001-3 finger tight. See Special Tools.
5. Pull the pinion gear firmly into the differential case seat.
6. Rotate the pinion gear back and forth.
7. Measure the backlash.
Specification: The backlash between the differential pinion gear and the locking
differential side gear cam unit should be 0.254-0.406 mm (0.010-0.016 in).
9. If the backlash is too large, install a thicker locking differential clutch disc thrust washer
and recheck the backlash.
10. If the backlash is too small, install a thinner locking differential clutch disc thrust washer
and recheck the backlash.
Locking differential clutch disc thrust washers are available in the following sizes:
Washer Sizes:
0.559 mm (0.022 in)
0.686 mm (0.027 in)
0.813 mm (0.032 in)
0.914 mm (0.036 in)
1.016 mm (0.040 in)
1.118 mm (0.044 in)
1.219 mm (0.048 in)
1.321 mm (0.052 in)
Right Side Gear Backlash Adjustment
1. If necessary, remove the following from the differential case:
1. The pinion lock shaft bolt
2. The pinion shaft
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
3. The differential pinion gears
4. The differential pinion gear thrust washers
5. The left side locking differential side gear cam unit and clutch disc assembly
2. Install the differential side gear shim into the right side or bell-end of the differential case.
3. Install the locking differential side gear and clutch disc assembly into the right side or bell-
end of the differential case.
4. Install the differential pinion gears with the differential pinion thrust washers into the
differential case.
Align the openings of the differential pinion gears and the differential pinion gear thrust
washers to the pinion shaft opening in the differential case.
5. Press down on the locking differential side gear and install the pinion shaft.
If the side gear cannot be pressed down far enough to install the pinion shaft, replace the
side gear shim with a thinner shim.
6. Install the pinion shaft lock bolt.
Tighten: Tighten the pinion shaft lock bolt finger tight.
7. Rotate the differential pinion gear so that one of the teeth is pointing downward,
perpendicular to the ring gear flange.
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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