I want to give a big thank you to Katie Hunsaker! She is amazing at what she does and so is the whole crew at ATS. My transmission went out on my 18 Ram 6.7 in the beginning on June and my wife just recently lost he grandmother in Florida so I need the truck to drive 4K miles in two weeks. Out of two shops ATS and maxtorque here in Colorado we'll really more just the final two, Katie was the only one that told me she'd have my truck to me before I left on June 18th. And she didn't give up on that promise she made to me. Durning the build they ran into a few obstacles but surpassed with flying colors. All together the build took longer then we both expected but I like that they really went the extra mile to make sure my truck was 100%. I will say if they say it will be ready Friday but call it off for a few days it's worth it! She had the guys come in on Saturday and work late nights dialing my transmission to right we're they wanted it. I love that even tho it was done Friday they said hay there's still some stuff we aren't liking and took the time to take it back apart to make adjustments to be where they wanted. I can say I had the transmission in my 14 rebuilt through aamco who promised they could build a Preformance transmission and a customer triple stage torque converter and over 9k and my truck was still back in a year later to the date I was told it was out of warranty by 1k mile and I only had 18k on it at that point and spent another 3k to fix it again (with the owner doing the labor for free). Moral of the store is, If you want the best F$*k the rest got to ATS!! I have a motto now but once cry once and I can say going through ATS I didn't even cry because I still paid under 9k for 100x the transmission. You can feel the difference when you get behind an ATS transmission. If your like me most of you can tell when you put your door to the floor that somethings going to break but with what Katie Scott and Their crew did you can feel how solid the shifts and and it didn't just grab a gear it grabs on and Bear hugs it!!! Best of all even if something does break their transmission come with a 3yr 300k mile , and 5yr 500k mile warranty and they always stand behind there products. When I called max torque the guy there gave me shit about oh I know how you drive the truck... point is I never said I didn't haul ass in it. The point is if I want to put my foot to the floor from the light or while pulling a camper and boat up the mountain, I want to know it's not going to poop out on me and that's exactly what ATS builds their stuff for. They want you to race it, they want to see how much power they can get out of a truck. I truly can't thank Katie, Scott and there crew for everything they've done for me. Katie you really are the best. Even with how busy you where with all the trucks and this whole pandemic you kept me posted on my truck at all times and never got upset when I'd call a lot just to ask or to ask you random question, you never rushed me off the phone or had an attitude, you where always so happy upbeat and appreciative even tho I was taking time from you. Most other shops or people would of got mad or just said the person wasn't there. But you made me feel like I was appreciated. I can't thank you enough I really can't!! If you want to be valved, treated with respect and just want to do business with some down to earth people that love building bad a** trucks like we do then go to ATS I promise you won't be disappointed!!!! read more

I work for Lead Foot Diesel Performance, we install parts for our customers that come from many different manufacturers. I have to give ATS Diesel Performance 5 starts because I couldn't give them a hundred, it wasn't an option. ATS Diesel Performance offers many things to our market, from transmissions to turbos chargers. I have personally installed many of their products and I have to say, their fit and finish is over the top when it comes to quality. Have I had parts fail, absolutely, anything man made has the potential to fail. It is the way Clint Cannon and his staff handle the returns and warranty process that makes them a 5 star company in my book. Jason Arce is usually the man I end up talking to when I do have an issue with a part I have purchased or installed for one of our customers. He has gone over the top for me every single time, he is polite, honest and above all he is good at communicating. I always get a call back when I am promised one, he always follows through with his word. People like Jason make companies like ATS GREAT! The thing that means the most to me though is when the owner Clint Cannon calls out of the blue just to make sure we are happy with not only his product, but also his employees. That means a great deal to me. For the absolute best diesel performance transmissions, torque converters and turbo chargers, check out ATS Diesel Performance! read more

I purchased a new ATS torque converter for my 1999 Ford E350 7.3L Powerstroke back in 2004. It has never had even the slightest problem. The van has been used to pull many U-Haul trailers in the years since it received that ATS torque converter. The high quality of that torque converter made it an easy decision for me when my transmission recently went out on my other Ford Powerstroke (2002 F350 7.3L). I contacted ATS to order the new transmission and torque converter for the 2002 F350. Had a great experience with everyone I worked with at ATS. The new transmission and torque converter were shipped and delivered on schedule. I installed them myself and my truck is running fantastic with the new ATS transmission and torque converter. I expect the same long life from this new ATS Tranny/TC combination in my 2002 F350 that I continue to have with my ATS TC in my 1999 E350. Thank you to everyone at ATS!! read more

It was a pleasure working with ATS Diesel. I want to say don't be put off by reading the bad reviews because my experience with ATS was some of the best customer service I've ever had. They delivered on time, handled all my inquires with professionalism and took the time to answer any concerns or questions I had. Being a woman it was refreshing that they didn't make me feel stupid when I asked stupid questions. It's been a few months since we installed the new transmission and we haven't had any problems. They returned my core deposit in a timely manner. I have no complaints and would recommend ATS. Dennis was the person I had the most contact with and he deserve a thumbs up for going out of his way and working long hours to keep customers happy. ATS wants your business and they deserve it! I give them 5 stars for customer service. read more

DO Not, DO NOT Bellevue their lies and DO NOT buy their tranny never ever. I replaced my good transmission with this BS, hoping to tow more and because of Covid I never ever told anything and in less then 10000 miles. My car is third time in the shop. Do not fall for their scam like I did. My original transmission had 130,000 miles I told and used it normally and never had any issues never and I removed that good transmission send it as a core and got their piece of shit transmission that's breaking third time in one year and I'm without car for two months and they definitely don't care. read more

Garbage straight poop there terrible customer service tops the chart worst I've ever had people don't have any knowledge of what they even do HAHA wow they need help ASAP!!! But hows the product you ask? Even worse complete garbage ruined my truck and they have nothing to say completely clueless lol! Go to RevMax Converters for anything ATS can do but 10 times better!! BD diesel another good one! Suncoast another there's lots but DO NOT USE ATS ANYTHING!! read more

I don't know about the quality of their work. I will let the other reviews discuss that. I wanted to let everyone know that the guy who drives their ATS pickup truck is an a-hole. He was spinning his tires all over 64th Ave in Arvada this morning and was rolling coal into the open windows of a car with a little old lady behind the wheel. The guy is a jerk. I have uploaded the video I took of his ride to the Jeffco and Arvada PD websites. read more

Ordered a part I could have gotten from almost anyone, but the ATS reputation is legendary in the diesel truck world. Very well thought out and mainly great construction on all their house name products. They have the best electronics for diesels and some of the best hard parts as well. You can find turbos and transmissions all over the internet, but ATS is THE name to go to and trust! Mike Ray read more

stock trans started going into limp mode at 36,000 miles pulling my 4 horse slant and scrap metal trailer, needed to get it back on the road quick and these guys handled it. Was hesitant but the price was right and it is local so I went with ATS. Over 114,000 miles later my allison is still going strong and getting me to races. read more

READ ALL THE REVIEWS 96% BAD!! OMG the people at this place know NOTHING!! DO NOT EVER PURCHASE ANYTHING FROM HERE! They will ruin your vehicle then they know nothing people here are very unintelligent by far worst place to purchase any diesel products just look at and listen to 95% of there reviews lol TRASH!!!!! read more

READ ALL THE REVIEWS 96% BAD!! OMG the people at this place know NOTHING!! DO NOT EVER PURCHASE ANYTHING FROM HERE! They will ruin your vehicle then they know nothing people here are very unintelligent by far worst place to purchase any diesel products just look at and listen to 95% of there reviews lol TRASH!!!!! read more

When my ATS transmission went out on a trip to Colorado, ATS got me in right away and swapped out the transmission to get me back on the road as fast as possible. From having no appointment to having my truck ready to roll only took 3 days. All this 100% covered under warranty. Amazing! Thank you so much! read more

Jeff in Tech support would be amazing if he could buy a clue! He is the dumbest TECH SUPPORT i have EVER heard of. He is beyond stupid, his answer for questions is either ummm ummm or i dont know! They have they worst products and customer service around. This company is a joke! read more

Purchased my stage 3 trans/ converter and Aurora 3000 straight from ATS and I've really been enjoying my 05' Dodge 3500 since! Trans stays nice and cool pulling through the hill country and turbo spools great, has lower EGTs and sounds damn good! read more

I recently had the people at ATS install compound turbos on my 14 Cummins, it took them some time but I am extremely satisfied with the results! Sucks to know they have a ton of satisfied customers who don't take the time to post a review. read more

My transmission was acting up so I took my truck to ATS. I needed a transmission overhaul. ATS got it done in a couple days and my truck has worked perfectly ever since. They communicated with me the entire time and we're very professional. read more

my 2001 duramax needed injectors and a torque converter. They did a nice job and for less then I paid for the dealer to do injectors last time. Reasonable price, quality work. Will use them next time. Dalton was very helpful. read more

My factory 5R110 failed on my 05 powerstroke during a vacation pulling my 32' 5th wheel. Dennis got me squared away fast and with a stronger unit then OEM. Been very happy with the service and the product. read more

Very knowledgeable staff. Amazing show room. Had some transmission issues in my truck and came here for help. Glad I did! Can't ask for a better experience. Will definitely be returning here in the future. read more