6. Countershaft
CountershaftImportant: Do not disassemble the countershaft. Individual components of the countershaft are not serviced. A damaged or worn countershaft must be replaced as a complete assembly.
1. Clean the countershaft in a suitable cleaning solvent. Air dry the countershaft.
2. Inspect the countershaft for cracks.
3. Replace a cracked countershaft.
4. Inspect the countershaft gears for the following conditions:
^ Scuffed gear teeth
^ Nicked gear teeth
^ Burred gear teeth
^ Broken gear teeth
^ High spots (Small shiny spots on the gear teeth mating surfaces) that could cause gear noise
5. Lubricate the countershaft bearings with GM P/N 12345349 Syncromesh Transmission Fluid (or equivalent).
6. Replace the bearing assembly if any of the following conditions exist:
^ Roughness of rotation
^ Burrs
^ Pitted condition
7. Replace the bearing race and inspect the mating parts If the following conditions exist:
^ Scoring
^ Wear
^ Discoloration from overheating