Chevrolet Silverado / GMC Sierra. Service manual — part 2822

Slight wear marks are normal.

Debris embedded in the root of the teeth

15. Inspect the thrust washer surfaces for excessive wear or scoring.

16. Replace the front sun gear (1) and the rear sun gear (2) if they are faulty.

Drive Chain and Sprockets

Fig. 59: Identifying Drive Chain, Drive Sprocket & Driven Sprocket
Courtesy of GENERAL MOTORS CORP.

1. Clean the drive chain (1), drive sprocket (2), and driven sprocket (3) in cleaning solvent and

air dry.

2008 Chevrolet Silverado 1500

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

Silverado

2. Inspect the drive chain (1) for the following conditions:

Loose link pins

Binding or stiff links

Debris embedded in the links

Worn teeth surfaces

3. Replace the chain if any of the above conditions are found.

4. Inspect the driven sprocket (3) and the drive sprocket (2) for the following conditions:

Chipped teeth

Excessively worn gear surfaces

Slight wear marks are normal.

Debris embedded in the root of the teeth

5. Inspect the drive sprocket bushing for the following conditions:

Excessive wear

Scoring

6. Replace the sprockets if any of the above conditions are found. The chain and sprockets may

be replaced separately.

Input Shaft

2008 Chevrolet Silverado 1500

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

Silverado

Fig. 60: View Of Input Shaft
Courtesy of GENERAL MOTORS CORP.

1. Clean the input shaft in cleaning solvent.

2. Inspect the input seal surface (1) for excessive grooves or damage.

3. Inspect the bearing journals on the input shaft for the following conditions:

The drive gear bushing (2)

The rear support bushing (4)

Scoring

Pitting

Brinelling

Excessive wear

IMPORTANT: Do not attempt to smooth any roughness in the bearing

journals.

2008 Chevrolet Silverado 1500

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

Silverado

4. Inspect the input shaft planetary carrier assembly splines (3) for damage or excessive wear.

Witness marks at the location of the gear is normal.

5. Replace the input shaft if any of the above conditions are found.

Front Output Shaft

Fig. 61: View Of Front Output Shaft
Courtesy of GENERAL MOTORS CORP.

1. Clean the front output shaft in cleaning solvent and air dry.

2008 Chevrolet Silverado 1500

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

Silverado