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Chevrolet Silverado / GMC Sierra. Manual - part 1326
Fig. 24: Identifying Misalignment
Courtesy of GENERAL MOTORS CORP.
A misaligned outer race due to a foreign object. Clean the related parts. Replace the bearing.
Ensure the races are properly sealed.
Cracked Inner Race
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 25: Identifying Cracked Inner Race
Courtesy of GENERAL MOTORS CORP.
Cracked race due to improper fit, cocking, or poor bearing seats. Replace the bearing. Correct
bearing seats.
Fatigue Spalling
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 26: Inspecting Bearing Rollers & Races For Pitting, Grooves, Spalling & Excessive
Wear
Courtesy of GENERAL MOTORS CORP.
Flaked surface metal that results from fatigue. Replace the bearing. Clean all related parts.
Brinelling
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 27: Identifying Brinelling
Courtesy of GENERAL MOTORS CORP.
Surface indentations in the race way caused by the rollers under impact loading or caused from
vibration while the bearing is not rotating. Replace a rough or noisy bearing.
FOUR-WHEEL DRIVE DOES NOT ENGAGE
IMPORTANT: Before performing the following diagnostic procedure, ensure
that all electrical diagnostic procedures have been performed and
there are no DTCs.
Step
Action
Yes
No
Confirm operation of system. Refer to
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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