Chevrolet Silverado / GMC Sierra. Manual — part 1325
Fig. 20: Identifying Frettage
Courtesy of GENERAL MOTORS CORP.
Corrosion caused by small relative movement of parts with no lubrication. Replace the bearing.
Clean the related parts. Check the seals. Check for proper lubrication.
Smears
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 21: Identifying Smears
Courtesy of GENERAL MOTORS CORP.
Smearing of the metal due to slippage. Slippage can be caused by the following factors:
Poor fits
Lubrication
Overheating
Overloads
Handling damage
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Replace the bearings. Clean the related parts. Check for proper fit and lubrication.
Stain Discoloration
Fig. 22: Identifying Stain Discoloration
Courtesy of GENERAL MOTORS CORP.
Discoloration ranging from light brown to black. This discoloration is caused from incorrect
lubrication or moisture. Reuse the bearing if you can remove the stains with light polishing. Reuse
the bearing if there is no evidence of overheating. Check the seals and the related parts for
damage.
Heat Discoloration
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 23: Identifying Heat Discoloration
Courtesy of GENERAL MOTORS CORP.
Heat discoloration ranges from faint yellow to dark blue. This discoloration results from overload
or an incorrect lubricant. Excessive heat causes softening of the races or the rollers. In order to
check for loss of temper on the races and the rollers, perform a file test. A file drawn over a
tempered part will grab and cut the metal. A file drawn over a hard part will glide readily with
no metal cutting. Replace the bearings if overheating damage is indicated. The tempered part will
fail the file test. Check the seals and the other related parts.
Misalignment
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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