Ok, it served us well for decades, the trusty main drive gear bushing, but it is certainly possible to improve this feature as we can see in the later 5-speed transmissions. So you simply modernize the set-up by installing needle bearings? Not quite. A mechanical engineer from good old Germany really did his homework here and came out with some extra fine products. We are looking at high end precision parts manufactured after the latest German automotive industry standards and when it comes to material selection, surface hardening, structure and function of components they are second to nothing. Weak points in the original design were consequently eliminated:

• Mainshaft updated with rolling bearing surface
• Redesigned main drive gear with bore for needle bearing
• Double "full circle" needle bearing support in lieu of bushing

The results are the precise alignment and guide of main drive gear to mainshaft, plus significantly improved service life and oil tightness. Only Carlo’s mainshafts serve as replacement parts. These, in turn, can be used as stock replacements.