Parts for Detroit Diesel ® engines,
Twin Disc ® Marine Transmissions,
Allison Marine, Engine Gauges
and Marine Gauges.

Diesel Pro Power is the world's largest replacement parts manufacturer and distributor of marine transmission parts for Allison M and MH marine transmissions. This page has been built to help you find the parts you need in just a few clicks. Choose to find the parts for your Allison M or MH by transmission model of by part category. By either method, you will quickly and easily find the parts you need to maintain, repair or rebuild your used or rebuilt Allison marine transmission. 

The Allison M and MH marine transmissions were exclusive manufactured for Detroit Diesel marine engines and come in the following models M15, M15L, M15R, M20, M20L, M20R for Allison M and MH20, MH20L, MH20R, MH45, MH45L, MH45R for MH. For the curious, MH 20 R stands for Allison MH marine transmission with a 2 to 1 ratio that is right hand rotation. You will find these marine transmissions in  fishingscuba divingcoast guard, and other work and pleasure boat applications around the globe.