Chevrolet Silverado / GMC Sierra. Manual — part 2629

performs a supporting function over a long period of time, there is not movement between
the gear and the supporting shaft, and the bearing contact areas may show signs of fretting
corrosion.

27. Replace any gears showing brinelling.

Fig. 129: Inspect Mainshaft Bearing Surfaces
Courtesy of GENERAL MOTORS CORP.

28. Inspect the mainshaft bearing surfaces for the following conditions:

Wear

Lack of lubricant

Debris embedded in the oil grooves

29. Inspect the main shaft splines for wear or damage.

30. Replace the main shaft if any of the above conditions are found.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (TZ0)

BEARINGS AND SPACERS CLEANING AND INSPECTION

Fig. 130: Bearings
Courtesy of GENERAL MOTORS CORP.

1. Clean all bearing components in a suitable solvent and air dry.

2. Inspect the bearings and journals for roughness and unusual wear or damage.

NOTE:

Do not allow the bearings to spin. Turn them slowly by hand.
Spinning the bearings may damage the race and the rollers.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (TZ0)