Redoing my one star review because it looks like they tried to cover this up. On July 15th, 2025 they did a tranemission flush for me instead of diagnosing the issue, and going off the engine code. The actual problem was with the transmission and the overdrive itself. I went to Ralph's foothills and they got me fixed up in a jiffy. While Active transmission swindled me out of $304. For a transmission flush I performed a month prior. These guys are clowns. read more

Went in with an engine code P0841, and came out with an engine code P0841. For a shop specializing in transmission repairs. They sure don't know how to fix one. Instead I was swindled $300 for a transmission flush that was serviced two months prior. read more

I was recommended by Arvada Square Auto to bring my car here after the dealer disaster I had when i had a crisis with my transmission. I had been told i had transmission problems that should be taken care of by the dealer. That was a joke as Larry Miller Ford was a DISASTER! My car sat for a month with no action being taken despite me starting to call daily after two weeks of no response. The technician couldn't even figure out what the problem was despite my garage telling them exactly what the problem was. DON'T ever go there, it is just TERRIBLE! I got my car over to Active Transmission and they told me it would probably be a week before they could get to my car. To my great delight, i got a call saying they could look at it a couple of days later. The news was bad, they had to replace the entire transmission and assorted other things. :-( However, it was made very clear to me exactly what was wrong and what they would do. I really appreciated being treated like i was intelligent. And my car ended up being done in less than a week! I can't say enough about the quality work and service for Active Transmission. Arvada Square Auto is also a Top notch garage and knows where to send their clients for the specialty work. It is great to know I can trust my cars to Active Transmssion and Arvada Square Auto. :-) read more

I've had Jeff and the crew at Active work on my F-150 a couple of times. Cordial, professional service that fixes the issue the first time. Pricing is transparent and fully explained. Scheduling an appointment was prompt and painless. Work was completed as promised. Tip top operation. Thanks! read more

We brought our 1966 Ford Mustang here for transmission work this week. The got the car in in a Monday afternoon and was done with it by Wednesday afternoon. The price was half of the other quote from another mechanic and three times as fast. Jeff was very responsive and his father was great to meet this morning. Just a great family business that you should visit if you need some transmission work completed. read more

These guys are amazing and fast. They replaced my clutch and flywheel for a good price. Not the least expensive I found, but definitely the most trustworthy and reliable. read more

The guys at Active Transmission have done work on a couple of my vehicles now. The quality was good, the price was fair, and they got the job done quickly. We will continue to bring our vehicles to them for repair and service. Thanks guys. read more

Excellent experience! I was referred here from an auto shop that I trust. I'm generally distrustful of anywhere that does auto repair, so the referral was important to me. I recently purchased a used truck, that recently had the transmission rebuilt. I got a check engine light and was having some transmission trouble, ran the code and it was a shift solenoid that was out. They replace the solenoid tune to the transmission and changed my oil, all for about half the cost of what I was expecting for just the solenoid. I will definitely be back and will refer others! read more

A big thanks to Jeff and the guys at Active Transmission! I took them my 2004 Infiniti, which had a bad vibration that began at just under 60 mph and was unbearable and scary at 70 mph. They diagnosed a bad drive shaft u-joint between the engine and the transfer case and replaced the entire drive shaft. Had it not been replaced, Jeff said, it could have failed and put a hole in the engine block. Jeff was prompt and courteous in his communications. The price was fair. I'm greatly relieved to have this problem solved. I highly recommend Active Transmission to anyone with running gear problems. read more

It is amazing to find a company that does the best of quality work and stands behind their warranty with no questions asked. Super people to work with. I totally recommend this shop for high quality Transmission work. read more

I love this auto shop. While they specialize in transmission, they do all of our other auto repairs as well. Every repair that I have priced out has been approximately 25% less than any other quote I can find. While they have been gaining customers, they still work hard to have our vehicles back in our hands as quickly as possible. I recommend them to all of my family and friends, so I certainly recommend them to you. read more

These are the guys you want when you need a transmission mechanic. Great value, awesome service and never had a problem with both trucks they repaired. Thanks Active Transmission! Highly recommend! read more

I didn't know these guys from Adam. I was attracted by some favorable reviews on another review site. My car was dropping in and out of gear, racing, clunking and otherwise seeming like an expensive transmission problem. I first brought it to Aamco in Denver. They wanted several hundred just to tell me tell me how much it would ultimately cost and absolutely refused to give a maximum. "You have to trust who you're dealing with." See ya. First good sign: when I called Active: It was closing time, but Jeff spent about 20 minutes on the phone with me, asking diagnostic questions and providing a lot of information about transmissions. Second good sign: no $ to diagnose. Third really good sign. Jeff and Vern (son/father) said I didn't have a transmission problem (remember this is a transmission shop), but had like 8 bad sensor readings. They theorized that 7 of the readings related back to the 8th, and recommended replacing just that one sensor. It fixed everything. $160 total. Draw your own conclusions. read more

I found this place by looking on the Tom Martino Referral List. I thought my car needed a brake job as well as a tune-up. I left the car overnight and the next day Jeff calls me to tell me that a) my brakes are fine and b) my car doesn't need a tune-up or anything else done to it. When I went to pick it up there was no charge for the service and time they spent looking at my car. I will definitely be taking my car back here. Thank you Active Transmission & Gear. read more

I had a wonderful experience with Active Transmission. My car was fixed in less than a week, and the entire transmission was rebuilt in that time. I dropped my car off Thursday night, and it was fixed by Tuesday afternoon (and they are closed on weekends!). Anytime you need to fix a transmission it is expensive, but the service here is so great that you will feel happy to have supported them. read more

Thanks for everything. I was having an issue and wanted to have a relearn performed. They said they could do it and quoted it at a good price. They were able to see me the same day ran the relearn in minutes and sent me on my way. read more

After having a local dealership tell me my wife's car needed a new transmission on a vehicle with less than 48,000 miles and paying over $100 for the diagnostic, someone referred Active Transmission for a second opinion. Sure glad we did! Jeff, Vern and their team of technicians couldn't have been nicer. They also thought that was pretty odd and they would take a look at it. They also did the diagnostic for free. After having done this, they found a loose wire, fixed it and we were on the road again. All for $175. Beats the $3000 the dealership wanted for a new/re-manufactured transmission. Thanks again, Active Transmission. You have new customers for life and we will spread the word on your professionalism and integrity. read more

Active Transmission is absolutely wonderful. After my car broke down on the highway, I had it towed to Active. They immediately took care of the problem at a price far below what my Chrysler dealer would have charged. I have used Active Transmission to service other vehicles of mine and I have always found them to be fair, friendly, capable and responsive. If I could give them a rating greater than five stars, I certainly would! P.S. They rebuilt the transmission in my mother's 1992 Buick and it is still running great. read more

I had to have the front differential gear on my truck replaced by a shop out of state. I noticed a leak about a month after I returned to Colorado. I took it to a shop close to home to have it looked at. I was told it would be expensive to fix. Great ! Now I have to get with a shop 1000 miles away to figure out what they will cover for repairs. I went to Active Transmission for a second opinion. It should have been my first choice! They tightened the loose drain plug, cleaned up the oil mess and sent me on my way. There was no charge for the service. I highly recommend Active Transmission. Jeff, Vern and their team are very professional. read more

Jeff is very professional and serviced my car quickly. Would definitely recommend for your car repairs....

We have taken multiple cars and trucks to Active Transmission and Gear for the past 12 years. They have always fixed the problems in a very short amount of time, and for an extremely reasonable price. We won't take our vehicles anywhere but Active. read more