RedLine Diesel Power, Medina OH

Awesome job transmission was done when they said have put 700 miles on it shift points are awesome so far. Very happy customer

Ordered our new transmission from RedLine and they were excellent! Great communication, fast responses, quality product. They made the whole process easy and my husband is extremely satisfied with the transmission. His truck runs like new. RedLine will take care of you!

I don't trust anyone else with my Cummins other than Karl at RedLine. Always goes the extra mile and puts his clients first. His work is flawless, as one would expect from a guy that is nationally known and has been covered in major diesel and truck rags. I recommend him without reservation. Rachel handles all customer service issues and is great to work with. His staff are the same competent professionals there every time I show up, which speaks miles about what kind of operation Karl runs. 10/10

Just dropped my transmission off this morning! I already know it will be done and done correctly! Very nice shop and Rachel is a rockstar! She went out of her way to help me! Thank you already and can’t wait for the finished product

I have a 5 year old 48re Build in my 05 ram 3500 and it has been put through its paces towing heavy, burnouts, dirt drag racing etc with zero issues to date

Had a 68EFRE stage 2 for my 2012 dodge built.redline changed fluid 15 months later.tyranny lasted 4 years.only towed landscape trailer 2 times.one day I had NO forward and NO reverse.my truck was 4 sale, traded it at dealer.i called redline lady told me they were a month out, that busy.i explained my situation, that th we truck is sold.and I need help.she said "you had us build it 4 years ago". Shouldn't a custom built trans last more than 4 years.truck had 60k on it stored winters.totally baby truck.dealer took off $10000 for blown trans. THINK TWICE BEFORE USING REDLINE.

I definitely recommend Karl and his team. I’ve been waiting to write this review. After burning up another transmission in my 04 ram 3500, I decided to take it to Redline. They had my truck for only a short amount of time “week and half. ” Karl kept me up to date on everything that was going on. I went with the stage 3 build and after towing heavy a few times “12,000+ lbs” I can’t believe how well this truck performs! Pulls hard! Shifts great! The transmission is running cooler than before! Finally putting all the power to the ground! I’m really happy with the results and glad I decided to take it to Redline. Thank you to Karl and the Redline diesel power team!

I had Redline Transmissions build a stage 2 68rfe for my 2012 RAM 2500. The process was seamless and these people are super nice. I dealt directly with Karl, the owner, and he walked me thru what is best for what I use the truck for. I would definitely recommend Redline to anyone in need of diesel or transmission services.

The team at Redline provided great customer service. They go above and beyond just selling you a transmission. They responded and helped with a few issues in the process. After the first week everything seems back to normal with the truck. Time will tell on durability but I trust in their team's expertise.

After a lot of research and reading reviews I decided to reach out to Redline for a transmission for my 2005 Ram 2500 Cummins. I contacted Karl and he was very knowledgeable about what I was wanting. He built me a stage 3 48RE and I drove 5.5 hours to have him install it for me. Karl and his team were amazing to work with and kept me informed about my service as I waited for it to be completed. After 2 weeks of driving on the new transmission I have to say I made the right choice. I would definitely use redline for any future Diesel needs.

I had my 2018 6.7 trans built the did a awsome job shifts amazing I got the stage 3 and I love it definitely recommend

Highly recommend, the transmission went out of my 2020 Ram an I was having trouble finding a shop that wanted to work on that new of a truck Karl an his team wanted to work on it, built me one specifically for what I’m doing with the truck an answered every question I had about it 10/10 recommend Redline

I had redline build a transmission for my 2005 dodge 3500 3 years ago. I tow my dump trailer with the truck about 150 days a year and haven't had any issues in 3 years. I just recently went back and had the trans fluid changed as well as my front and rear differential s. I was able to wait while the service was performed, it took less than 2 hours and I waited in the lounge watching TV. Dealing with redline is so easy I wish all business 's would treat you the way they do. I highly recommend them!

Great business to work with they did my transmission in my 07 Cummins A few months back I’ve had time to put some miles down with the new Transmission works great. They are very personable will answer any questions you have my have. I highly recommend

Karl and his team did an excellent job building a stage 3 5r110 for my 06 F350. Having them build it was the best decision yet for the truck. It puts down about 650hp and it hold it so damn well now. They got the truck done when they said they would (5 days) and we’re very good communicating along the way. When I picked it up the truck was clean inside and the professionalism was outstanding. I like working on my own stuff and stay away from most shops, but I will give these guys business any day! 11/10

The transmission went out in my 2016 Ram 2500, I knew I needed a good one because I tow a lot.i was referred to redline by quite a few guys and after the 1st call and speaking to Karl, I knew I got a great shop.
Karl explained the different options and was very professional, yet still talked to me like I was a friend. I also had some turbo issues with the truck and they straightened it out without hesitation.

Redline gets a 10/10 in my book. I put just over 1000 miles on the new transmission in 2 days after it being built and the truck runs phenomenal!
I highly recommend Karl and his crew at redline!

I’m from Utah paid in full for a stage 2 48re Karl had it built and shipped in a very decent timely manner! He’s very professional and answers all the questions I’ve had! It’s been a very positive experience especially since this is my first transmission I’ve bought! Would definitely recommend!