About Us

Welcome to RedLine Transmissions

Dodge/RAM trucks lined up in front of RedLine Diesel Power Transmissions


RedLine Transmissions are your Cummins and Duramax specialists! Our custom-built automatic transmissions are all manufactured in-house. Our experience delivers more power to the ground, guaranteed!


Redline Transmissions is Northeast Ohio’s source for high-quality transmissions, performance, and repair. 

We offer:
• Automatic diesel transmissions for Dodge/RAM Hellcat/SRT, Chevy/GM, and Ford
• Complete diesel truck performance and repair, Cummins and Duramax—engine
• Fuel Injection Components
• Air intakes & gauges 
• Hot Rod diesel pickup truck builds from mild to wild and beyond!


Our reputation is known for our problem-solving skills specializing in the powertrain department. In-house transmission building is just one service that has separated RedLine Transmissions from its competitors. We build transmissions that fit your application, regardless of your power level. As a result, we can build a transmission that will hold and prove to be more efficient. Many transmission re-builders make this claim, but our experience will get the job done correctly.


Our team is experienced and experts in automatic transmissions for Dodge/Ram Cummins, GMC/Chevy Duramax and Ford Powerstroke engines. We are also skilled in performance and repair for Dodge and Chevy trucks.


RedLine Transmissions builds a full line of upgrades for light-duty diesel trucks, including HD transmissions, billet-covered torque converters with custom stall speeds, custom turbochargers, and more. Performance upgrades designed and built for reliability with increased driveability available for Dodge, GM, and Ford diesel pickup trucks.


Our custom transmission packages feature billet components and the most substantial gear trains available. All light-duty types of diesel trucks are covered. Ask us about our performance upgrades!


A simple philosophy is at the core of our business. Your truck will receive the same quality install or repair we would do on our vehicles. Diesel trucks are our passion. It is in our blood. It is what we were born to do. We are proud to say we have over 16 years of experience and over 1700 transmissions built. If you would like to learn more about our history, click here.


Not only do we build superior transmissions, but we are pros at installing them. Our transmissions are installed in our shop located in Medina, OH which is a suburb 25 minutes south of Cleveland. If you are unable to bring your truck to us, we have the full capability to ship the transmission to you. We are are able to ship anywhere in the contiguous United States.

RedLine Transmissions services transmissions for Dodge RAM Cummins 2500 and 3500 including 47RH, 47RE, 48RE 68RFE, Chevy Duramax Allison 1000/2000 and Ford Powerstroke transmissions E40D, 4R100, 5R110 and 6R140. We ship to Alabama, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, and Wyoming