Off Highway Allison 6000 Series Model S6610A Transmission
Off Highway Allison 5000 Series Model 5620A transmission
Remanufactured Allison 4500RDS Transmission


Catalyst Powertrain is your leader in on highway and off highway industrial transmission overhauling and repair. Since 1986 we have been serving customers in the Construction, Mining, Farming, Marine, Logging, Energy, Trucking and Material Handling industries.

With one of the largest Allison Transmission inventories in the United States, our customers benefit from same day availability on remanufactured transmissions and Genuine Allison parts.


Our certified service technicians and sales staff in Seattle and Portland have over 120 years of combined experience in the Allison and industrial transmission fields. Along with our Allison product lines, Catalyst Powertrain service centers in Seattle and Portland provide full-service Truck & equipment repair needs to help customers reduce downtime and increase profits!

Transmissions, differentials, PTO’s, axles, clutches, and much more… Call today for more information!


Our primary goal is exceeding our customers’ expectations in every aspect of their experience.

From the time customers first contact us with an inquiry to the time they receive or install our product, our customers can count on honest, helpful information and competitive pricing from our staff. Please feel free to give us a call today.

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