Chevy 4-Speed Muncie Input Shaft Seals

We have the Chevy manual transmission parts you need, whether you’re fixing a late-model vehicle or a classic fitted with a Muncie 4-speed. The M20, M21 and M22 share the same basic components, with the only major difference between models being their gear ratios. That means parts like a Muncie 4-speed input shaft seal should fit all three models, except for the small bore transmission that was only sold in 1963. We carry replacement input shaft seals, as well as a Muncie 4-speed seal kit with all the gaskets you need for reassembly. We also have a complete rebuild kit that includes the seals, bearings, synchros and other small parts needed to refresh your transmission’s internals.