Redline Transmissions

Redline Transmissions OFFICIAL REDLINE TRANSMISSIONS Cummins and Duramax specialists! Automatic Transmissions. We Build it Better! All light duty diesels covered.
(1)

We build high-performance, heavy-duty transmissions for diesel pickup trucks built to handle more power, towing, and everyday reliability. Redline Diesel Power is northeastern Ohio's source for High Quality Transmissions, Performance, and Repair. We offer:

• Complete diesel truck repair & performance Cummins and Duramax—engine
• Automatic diesel transmissions For Dodge, GM, Ford
• Fuel Injection

Components
• Air intakes, Gauges,
• Hot Rod Diesel Pickup Truck Builds from Mild to Wild and Beyond! Our reputation has been built on problem solving in the power-train department, in house transmission building is just one service that has separated Redline from its competitors. We build transmissions that fit your application, regardless of power level. We can build a transmission that will hold and prove to be more efficient. Many transmission re-builders make this claim, but our experience gets it done. RedLine Diesel Power builds a full line of upgrades for light duty diesel trucks including: HD transmissions, billet covered torque converters with custom stall speeds, custom turbochargers & more. Performance upgrades designed & built for reliability & increased drive ability, available for Dodge, Ford & GM pickups. Our custom transmission packages feature billet components & the strongest gear trains available. Call for performance upgrades!

04/23/2026

66RFE HD Boss 550 Build getting the finishing touches on the bench! We are your go to source for all of your 66RFE and 68RFE needs.

Another set of our 2013-2018 RAM 68RFE Transmission Lines shipping out! These are available on our website with or witho...
04/23/2026

Another set of our 2013-2018 RAM 68RFE Transmission Lines shipping out! These are available on our website with or without the thermal bypass block. They fit in the stock location. They are made out of high quality Stainless Steel and are the solution for replacing the failure prone factory aluminum lines. We have test fit them on 2019-2024 trucks and they work just fine in that application as well.

04/13/2026

72 Fast Build is progressing. Lots of modifications and Customization going on over here to get this thing done. It’s turning out Pretty Bad A$$ though!

Update on the 72 Fast truck Build. Lots of road blocks with custom parts fitment issues that I seem to constantly be wor...
03/29/2026

Update on the 72 Fast truck Build. Lots of road blocks with custom parts fitment issues that I seem to constantly be working through. Keep in mind for the most part I am working on this truck nights and weekends mostly by myself to keep my customer jobs getting done in a timely manner in the shop. Currently I have the Engine assembled, painted and installed in the truck. The transmission is built and installed in the truck along with the transfer case. Most of the chassis work is done. It is almost a full time job in itself to think ahead to order all the parts I need before I need them.

There is still a lot to do. I have to wire the entire truck, bend up and install all the brake lines. Plumb the entire fuel system, finish welding up the seat and shifter mounts, make a mounting solution for a radiator and intercooler that do not belong where they are going, etc.

Here are some pictures of the recent progress I have made on the truck.

03/25/2026

We Built one of our HD Boss 700 6R140 Transmissions for this 2015 F350 welder rig! The truck was dropped off with a couple neutrals on gear apply and incorrect gear ratio codes. We Built this Bad A$$ unit for him and now the truck shifts like a hotrod!

We built and installed our Tow Boss 550 68RFE with a few additional billet upgrades for this 5th Gen Ram. Keep RedLine i...
03/22/2026

We built and installed our Tow Boss 550 68RFE with a few additional billet upgrades for this 5th Gen Ram. Keep RedLine in mind when you are looking to maintain, upgrade or completely build your Diesel pickup transmission. We have the right real world solutions for your goals.

03/21/2026

Work on my 72 Fast truck is still going strong. It does prove to be challenging with shop weeks that are so extremely busy to spend my weekends on this build. 76 Days left till the race.

03/20/2026

Super Clean low miles 1996 Dodge Ram 3500 in Grandpa trim in the shop for a major Transmission upgrade. We yanked out the Stock slush box and Built our HD Boss 650 for it.

2026 is a very exciting year here at RedLine. We are extremely busy building our best sellers and innovating new product...
03/19/2026

2026 is a very exciting year here at RedLine. We are extremely busy building our best sellers and innovating new products and solutions for our customers . I have a different approach than most companies in this industry. I put my 20 plus years of Diesel knowledge and experience to work 110% for my customers. I want to help my customers win that sled pull, run there new personal best at the race, tow there trailer across the country and back safely, improve there driving experience and love there truck again. That drives me and my team at RedLine to keep giving our best each and every day.

03/18/2026

2019 RAM getting a fresh new build. Here is one of our Tow Boss 550 68RFE’s. No cookie cutter rebuilds here. Custom Machined Castings, High Quality Parts, Billet internals and Precision Assembly! Get yours Today!

Address

865 W. Liberty Street Suite 100
Medina, OH
44256

Opening Hours

Monday 8am - 12pm
1pm - 5pm
Tuesday 8am - 12pm
1pm - 5pm
Wednesday 8am - 12pm
1pm - 5pm
Thursday 8am - 12pm
1pm - 5pm
Friday 8am - 12pm
1pm - 5pm

Website

Alerts

Be the first to know and let us send you an email when Redline Transmissions posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Shortcuts

Share

Category