Transmissions - M40, M41

Gearbox rebuilds include all new wear components - synchros, bearings, thrust washers, gaskets and seals. Overdrive units often don't need anything more than gaskets and O rings, but if yours has suffered unusual wear or catastrophic failure (as shown below!!), we can repair or replace as needed. If you're looking for a used replacement rather than a rebuild, we maintain an inventory of M40 as well as both D and J type M41s.