Mainshaft

1. Inspect gears for cracks, chipped gear teeth and other damage that could cause gear noise.

2. Inspect thrust washers for damage or wear.

3. Inspect synchronizer sleeves for a sliding fit on synchronizer hubs, also, hubs have to be snug fit on mainshaft splines.

4. Inspect synchronizer springs and keys for looseness and damage.

5. Inspect all gear teeth for excessive wear.

6. Inspect bearings and bearing surfaces for nicks, burrs and wear.

7. Lubricate all roller bearings with light engine oil and check for rough rotation.