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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 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 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 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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