Automatic Transmission Builds
At RedLine Transmissions, we specialize in building strong and reliable Chrysler 68RFE, 48RE, 47RE, and Allison 1000 diesel performance transmissions. Our transmission builds are designed to withstand hard work, play, towing, and high horsepower. At the end of the day, RedLine builds it better. For you.
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Diesel Automatic Transmissions
Diesel transmissions shouldn’t just survive—they should dominate. At RedLine, we build high-performance and heavy-duty automatic transmissions for Cummins and Duramax trucks that crush the limits of stock.
Whether you tow for a living or chase horsepower on the weekends, our transmissions deliver real-world reliability, unmatched torque handling, and proven results backed by decades of hands-on experience.
We don’t talk theory—we’ve tested every build in the shop, on the road, and under load. RedLine Transmissions engineers, assembles, and tests every 68RFE, 48RE, 47RE, 47RH, and Allison 1000 unit in-house to put your power to the ground and keep your truck moving strong.
Diesel Performance Parts & Upgrades
We understand that diesel enthusiasts have diverse needs, from daily driving and heavy towing to exhilarating drag racing and competitive truck pulling. That’s why we offer an extensive range of products, including cold air intakes, turbochargers, twin turbo kits, and 48-state legal tuners, carefully selected from the industry’s best brands.
RAM 2500/3500 Transmission Parts
From Valvebodies to Billet Heavy Duty Output Shafts, Front Pumps, Billet Flex Plates, and Torque Converters, our products are the result of rigorous testing and real-world experience. We don’t just sell these parts; we use them in our own transmission builds to ensure they stand up to the toughest challenges. When it comes to transmission parts, we’re committed to doing whatever it takes to keep your Dodge Ram Cummins Transmission running smoothly and reliably.
Experience-Built Automatic Transmissions
With nearly 25 years in the industry, we KNOW Cummins and Duramax transmissions. We build performance transmissions for Dodge RAM 68RFE, 48RE, and 47RE, as well as Chevy Allison 1000/2000. Our diesel transmissions are custom-built in-house with QUALITY USA parts, designed for longevity, with the added benefits of power and performance.
From Workhorse to Race Truck — RedLine Builds It Better.
At RedLine Transmissions, we build diesel transmissions that dominate under pressure.
For more than 19 years, we’ve worked tirelessly building high-performance and heavy-duty transmissions for Cummins and Duramax trucks that demand more than stock can handle. We design, engineer, and test every 68RFE, 48RE, 47RE, 47RH, and Allison 1000 unit in-house to deliver crisp shifts, massive torque capacity, and proven reliability for any use — work, towing, or performance. We don’t guess; our build are tried and true because they are in our own trucks.
When you run a RedLine transmission, you run a build that’s stronger, more durable and longer-lasting than anything in the market. If you value power, precision, and reliability, you’re in the right place — because RedLine builds it better, for you.
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Whether it’s towing heavy, daily driving, or chasing horsepower, we’ll guide you toward the perfect build for your setup.
We’ve worked with thousands of truck owners just like you, and we know exactly what it takes to match the right transmission to your goals.
Get a FREE Estimate or talk to a transmission EXPERT. Contact Us TODAY!
Build
MADE for YOUR POWER & PURPOSE
Once we know your needs, we get to work. Every RedLine Transmission is hand-assembled by experienced builders and tested before it ever leaves our shop.
Your build can be installed right here at local shop in Ohio or shipped directly to you or your trusted installer — ready to install and perform.
From the first bolt to the final test, we make sure it meets our standards: strong, precise, and proven. Because we don’t just build transmissions — we build confidence.
Drive
JOIN THE LEADERS
Once your RedLine Transmission is installed, you’ll know it from the first shift.
That smooth, firm engagement — the way it grabs and holds under load — it’s the feeling of confidence. The worry disappears. The second-guessing is gone. You’ll drive fearlessly, knowing your transmission was built to take it.
Whether you’re towing, working, or just enjoying the open road, you’ll feel proud knowing you made the right decision — the RedLine decision.
Warning: These builds are known to create serious jealousy among friends.
Tech Talk
Helpful information, advise and knowledge for the experts about automatic diesel transmissions and performance upgrades. If is has horsepower or you want to add more horsepower, this is the place for you.
2018 RAM 2500
68RFE Transmission - "The 550"
Solid Transmission Build!
"Have had a RedLine Transmission in my truck for 1,200 miles. Transmission is very solid and you can feel the transmission holding on to the gears longer while in use. Another big plus is that they had my truck in and out in five days. This is great because my truck is a daily driver and tow rig. 100% recommend this company. Can't wait to tow the fifth wheel this summer.
- Tim B.
2002 Dodge Ram 2000
47RE Transmission - "The 650"
Built & Shipped!
I purchased a built 47RE Transmission for my Ram pickup and it has been driving beautifully so far. Amazing customer service, great product and a pleasure to work with. Definitely recommend!
- Deagan O.
2016 Ram 2500
68RFE Transmission - "The 700"
Highly Recommended
"Had by 2016 68RFE rebuilt at RedLine. Nothing but good things to say. They are priced right. It's been 8 months and 10,000 miles and it is running super strong with no issues. Highly recommended!
- Aris A.
2020 RAM 2500
68RFE Transmission - "The 550"
Nothing but the best!
Quality of the work and the service you receive. Worth it to check them out and get your work done.
- Steve Z.
Transmissions
Services & Parts