Contact Tier One!

Welcome to Tier One Transmissions! Feel free to contact us either by phone at 602-399-5484 or through our contact form below if you have questions about our built diesel and gas truck transmissions, our selection of performance parts and accessories, or to schedule an appointment for diagnostics or repair. You can also stop by our full-service transmission shop in Phoenix, Arizona located at 23042 N. 16th Lane, Phoenix, AZ 85027. Our hours of operation are 7:00am-5:00pm Monday through Friday. We look forward to hearing from you!