GPI – C6 Corvette Manual Transmission Pilot Bearing Modification

Over the years of specializing in GM builds, we have picked up on several common nuisances or potential issues that are inherently aggravated by aggressive driving, drag racing, or even road racing. Often, we have developed solutions or “work-arounds” for many of these issues. We are excited to be able to share with you one of these solutions we have implemented over the years with great success.

A common issue on the C6 Corvette with manual transmission is the torque tube input shaft excessively wearing on the pilot bearing mating surface. The C5 Corvette did not have this problem with the needle bearing system in place. However, on the C6 Corvette, a roller bearing system was introduced in 2005.

The root cause of the excessive wears stems from the shaft turning in the inner bearing race as opposed to the bearing race turning as designed. It had to be built with a slip fit so the torque tube could be installed and removed, while at the same time, have enough interference fit to retain the bearing’s outer race in the crankshaft. This adds drag to the bearing and only worsens the symptoms as the engine heat changes clearances even more.

With the needle bearing, the shaft becomes the inner race and has no choice other than to turn in the needle bearing. We have successfully installed this retrofit option in numerous customer cars over the years with great success – and no complaints.