Chevrolet Silverado / GMC Sierra. Service manual — part 2820

Fig. 53: View Of Mainshaft Rear Support Bushing
Courtesy of GENERAL MOTORS CORP.

32. Inspect the mainshaft rear support bushing in the rear output shaft for being faulty. Refer to

Transfer Case Cleaning and Inspection.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - BW 4485-NR3 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

33. Using the J 2619-01 (1) and the J 45548 (2), remove the mainshaft rear support bushing

from the rear output shaft. See Special Tools.

Fig. 54: Using Special Tools To Remove Rear Bearing
Courtesy of GENERAL MOTORS CORP.

34. Using the J 26941 (3), the J 45124 (1), and the J-45124-9 (2), remove the rear bearing for

the front output shaft from the rear case. See Special Tools.

TRANSFER CASE CLEANING AND INSPECTION

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - BW 4485-NR3 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Front Case Half

Fig. 55: Identifying Front Case Inspection Points
Courtesy of GENERAL MOTORS CORP.

1. Clean the front case half in cleaning solvent and air dry.

2. Remove the metal shavings from the case half bolt holes.

3. Remove the sealer from the case sealing surfaces.

4. Inspect the case for being broken or cracked.

5. Inspect the front output shaft front bearing bore (5) for the following conditions:

A spun bearing

NOTE:

Refer to Machined Surface Damage Notice .

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - BW 4485-NR3 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Cracks

6. Inspect the input shaft bearing bore (4) for the following conditions:

A spun bearing

Cracks

7. Replace the front case half if any of the above conditions are found.

8. Inspect the sealing surfaces (1) for damage.

9. Repair small scratches or nicks with a soft stone.

10. Inspect the front case to transmission case mounting surface for damage.

11. Inspect the case threaded bolt holes (2) for damage.

12. Repair any damaged threads.

13. Inspect the transmission to transfer case studs for damage.

14. Replace any damaged studs. Refer to Transfer Case Disassemble and Transfer Case

Assemble.

15. Inspect the location pins (3) for being loose or missing.

16. Repair or replace any damaged location pins.

17. Inspect the front output shaft front bearing and the input shaft bearing for the following

conditions:

Roughness

Brinelling

Pitting

18. Replace the bearings if any of the above conditions are found. Refer to Transfer Case

Disassemble and Transfer Case Assemble.

Rear Case Half

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Transfer Case - BW 4485-NR3 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado