Chevrolet Silverado / GMC Sierra. Manual — part 2822
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
2. Inspect for spun bearings at the front output shaft bearing areas.
3. Inspect the front output internal splines and driven gear splines for damage or excessive
wear.
4. Replace the front output shaft if it is damaged.
5. Inspect the cup plug in the front output shaft for leaking.
6. Replace the cup plug if it is leaking. Refer to Transfer Case Disassemble and Transfer
Case Assemble.
Rear Output Shaft
Fig. 62: View Of Rear Output Shaft, Bearing & Mainshaft Rear Support Bushing
Courtesy of GENERAL MOTORS CORP.
1. Clean the rear output shaft with rear output shaft bearing in cleaning solvent.
2. Air dry and ensure all solvent is removed from the bearing.
3. Inspect the rear output shaft bearing for the following conditions:
Scoring
Pitting
Brinelling
Excessive wear
4. Replace the rear output shaft bearing if it is faulty. Refer to Transfer Case Disassemble
and Transfer Case Assemble.
5. Inspect the mainshaft rear support bushing for the following conditions:
Pitted
Wear
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Transfer Case - BW 4485-NR3 - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
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