Tier One - High Performance Truck Transmissions & Service

Tier One Transmissions specializes in building, installing, and servicing high-performance transmissions for Ram Cummins, GM Duramax, and Ford Powerstroke trucks that are putting down serious power or working hard on or off the road. We also offer transmission builds and repair for Ram 1500, GM 1500, and Ford F150 trucks, as well as other vehicles. We are a full-service transmission shop in Phoenix, Arizona that can diagnose, repair, or rebuild your vehicles automatic transmission to better than OEM specifications and reliability. We pride ourselves on our dedication to customer service and satisfaction. Contact Tier One today to schedule a diagnostic or to see about one of our built truck transmissions!

Customer Reviews

Honest guys to work with.

Dalton C. Honest guys to work with. Have gotten a few 48re parts from them and have gotten a Allison build done by them and was on a tight time frame and they got it done quickly!

Great company

Juan C. I would highly recommend Tier One Diesel. Dealing with Tanner was always easy, he was prompt with any call and question that I had. They are a great company.

Exceptional to work with

Thomas B. I have been using a tier one valve body ever since I ventured into automatics in 2018 (I think). Matt has been nothing but exceptional to work with

Amazing service

Alexandria R. Been having car issues so I called tier one diesel. Fixed my overheating issues and my ac has never blown cold air so I’m a blessed mom. Same day fix, and amazing service. Highly recommend!

23042 N. 16th Lane, Phoenix, AZ 85027

Mon-Fri7:30am - 4pm

SundayClosed

SaturdayClosed