- Clean all the parts in a suitable cleaning solvent. Air dry all
the parts.
Important: Do not spin the bearings without a lubricant.
- Lubricate the mainshaft bearings with GM P/N 12345349
Syncromesh Transmission Fluid (or equivalent).
- Check the bearings for rough rotation.
- Inspect the mainshaft gears for the following conditions:
| • | High spots (small-shiny spots on the gear teeth mating surface)
that could cause gear noise |
- Inspect related gear surfaces like thrust faces and bearing surface
diameters.
- Inspect the synchronizer sleeves for a sliding fit on the synchronizer
hubs. The synchronizer hubs must have a force fit on the mainshaft splines.
- Replace a synchronizer hub that does not require a force fit on
the mainshaft splines.
- Inspect the synchronizer springs and the keys for damage.
- Inspect the synchronizer rings for excess wear.
- Inspect the synchronizer clutching teeth for the following conditions:
- Inspect the mainshaft drive gear clutching cones for synchronizer
ring metal transfer.
- Inspect all the gear teeth for excess wear.
- Remove nicks and burrs with a soft stone or a crocus cloth.
- Replace any components that are bent or show signs of excessive
wear. Inspect the mating parts.
- Inspect the bearings and the bearing surfaces for the following
conditions:
