Chevrolet Silverado / GMC Sierra. Service manual — part 1375

8. Install the thrust bearing and the washer (2), the J 45858-6 (1), and the J 45858-2 (3) as

shown.

9. Slowly turn the J 45858-6 until the outer pinion bearing cup is evenly seated over the outer

pinion bearing cup bore and the J 45858-2 is evenly seated within the inner pinion bearing
cup.

10. Turn the J 45858-6 clockwise slowly in order to draw the outer pinion bearing cup into the

outer pinion bearing cup bore.

Inspect the position of the outer pinion bearing cup as it is being drawn into the outer pinion
bearing cup bore to ensure the bearing cup is being pulled straight into the pinion bearing
cup bore. If the pinion bearing cup is not being pulled straight into the bearing cup bore,
remove the J-45858 and the outer pinion bearing cup and reposition the outer pinion
bearing cup. See Special Tools.

11. Tighten the forcing screw until the outer pinion bearing cup is seated in the outer pinion

bearing cup bore.

12. Remove the J-45858 . See Special Tools.

13. Measure the pinion depth and determine the selectable pinion shim thickness. Refer to

Pinion Depth Adjustment.

FRONT DIFFERENTIAL DRIVE PINION GEAR BEARING CUP INSTALLATION (8.25/9.25 INCH
INCH AXLES W/J 36598)

Tools Required

J 36598 Holding Fixture. See Special Tools.

Installation

1. Before assembly, apply axle lubricant to the pinion bearing cups. Refer to Sealers,

Adhesives, and Lubricants.

2. Install the J 36598 into a vise. See Special Tools.

2008 Chevrolet Silverado 1500

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

Fig. 195: Seating Outer Pinion Bearing Cup Evenly Within Outer Pinion Bearing
Cup Bore J 36598 (8.25/9.25 Inch Axles)
Courtesy of GENERAL MOTORS CORP.

3. Install the left differential carrier case half into the J 36598 and the J 36598-6, 8. See

Special Tools.25 inch axle, or the J 36598 (1), 9. See Special Tools.25 inch axle.

Tighten the attaching bolts securely.

4. Install the J 36598-3, 8.25 inch axle, or the J 36598-4, 9.25 inch axle (2), onto the forcing

screw of the J 36598 . See Special Tools.

5. Install the outer pinion bearing cup into the differential carrier case.

6. Install the J 36598-3, 8.25 inch axle, or the J 36598-4, 9.25 inch axle (2) onto the outer

2008 Chevrolet Silverado 1500

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

pinion bearing cup.

Rotate the J 36598-3 or the J 36598-4 and the outer pinion bearing cup several time in
order to seat the outer pinion bearing cup evenly within the outer pinion bearing cup bore.

7. Install the outer pinion bearing cup into the differential carrier case half by holding the

forcing screw of the J 36598 and turning the handle counterclockwise. See Special Tools.

Inspect the position of the outer pinion bearing cup as it is being installed into the outer
pinion bearing cup bore to ensure the bearing cup is being installed evenly. If the pinion
bearing cup is not being installed evenly, loosen the J 36598 and remove the outer pinion
bearing cup. See Special Tools. Reposition the outer pinion bearing cup over the outer
pinion bearing cup bore and re-install.

8. Remove the J 36598-3 or the J 36598-4 from the forcing screw of the J 36598 . See

Special Tools.

2008 Chevrolet Silverado 1500

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

Fig. 196: Installing Inner Pinion Bearing Cup J 36598 & J 36598-4 (8.25/9.25 Inch
Axles)
Courtesy of GENERAL MOTORS CORP.

9. Install the J 36598-15 (2) into the outer pinion bearing cup.

10. Install the inner pinion bearing cup into the inner pinion bearing cup bore.

2008 Chevrolet Silverado 1500

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