This place is a scam. I brought in my 2020 Camaro for a fluid exchange because I was experiencing a…read moreshudder. After their "diagnostic," they told me they were getting a code and when I looked up the code it was related to the engine, not the transmission, and claimed I couldn't just do a fluid exchange. Instead, they recommended a full rebuild, saying my transmission fluid was contaminated. When I asked to see the fluid, they told me they don't take pictures. I then asked what the fluid actually looked like, and the employee said he'd check with his technician. He already seemed irritated at this point. He went to the back, came back, and simply repeated that the fluid was contaminated. When I pressed again for details, he said he didn't know because the technician wasn't there, which made no sense since he had just said he went to ask him. At that point, I decided to get a second opinion. The employee became dismissive and said another shop would tell me the same thing. I told him that's exactly why I wanted a second opinion. I ended up taking my car to Pro Trans Automotive in Riverside, where they informed me there's a known issue (Bulletin posted by chevy) with my vehicle and that a simple fluid exchange with updated fluid is a common fix. I had it done, and the shudder is completely gone. No rebuild needed. The difference in honesty and customer service was night and day. This shop tried to upsell me on a major repair I didn't need, while the other shop fixed the issue correctly and affordably. I would not trust this location. Take your car somewhere else. (Highly recommend Pro Trans Automotive if you are in the Inland Empire)

They had my car up and running within a week through the warranty. They were kind and informed me…read moreof everything every step of the way. I would definitely come back and recommend them.

Service was great on my 2021 Silverado 1500. Dropped off truck and was called back within 2-3 hoursread more

My sister in law had this business replace her transmission. They would only accept cash, not even…read morea check, and no credit card. Who would make a woman in her 60's bring $6000 in cash to their business? VERY Sketchy. Her transmission works, so that's good.

don't usually write reviews unless a place truly earns it -- and RPM Auto Body and Mechanic Repair…read moreabsolutely deserves it. I worked with them for about six years when they were located in Anaheim, and when they relocated to Riverside, I continued to follow them. That alone should say everything. I drive 80 miles just to have my car serviced here -- that's how much I trust them. This is truly a one-stop shop. From A-to-Z they handle everything: bodywork, mechanical repairs, paint, detailing -- they do it all, and they do it right. The quality of their work speaks for itself. Beyond the work, the people are simply amazing. The owner is one of the kindest, most genuine people I've ever met. Honest, professional, and always treating customers with respect. If you care about your car and want a place you can trust completely, this is it. I wouldn't take my car anywhere else.

Very good service. They explain everything on what needs to be fixed and why…read more The cost for my repair is good. I do not feel it is over priced. Thank you so much for fixing my 20 year old car. It drives like new.

Excellent and fast service, they took great care of my Mercedes GLC 300 coupe. They are honest and…read morereliable. I definitely recommend them.

They are thieves. They claimed to do work that they did not do. They charge me $4,000 and broke…read moreitems on my engine. They are not trustworthy. Took S63 to Walters Mercedes and car has not been in the shop since. Do not go to them for any car service.

Where to begin with the amount of kudos and appreciation for HD Auto Transmission. From the time…read morewhen I called in for a quote for transmission rebuild and spoke with Emily, she was very thorough, polite, very helpful, and provided exceptional customer service! Ethan, the Man, the Myth, the Legend! If you want quality, honest and trustworthy work done for you, come see Ethan! He is extremely passionate and knowledgeable about his craft, he will explain in layman's terms how things work and you can see the level of pride he takes in his work! I am elated to have found such a great Team that I can rely on to keep my toys and family vehicles safely on the road! Much appreciation to you all!

Had a busted transmission line they got on it as soon as I pulled up and I was on the road again…read morewithin the hour they even cleaned up the undercarriage 100% recommend them

Great value, Good Service. These guys are lifesavers. Restored my faith in people and business…read moreintegrity. The first time I came here the AAA battery guy told me I needed an alternator. So a different AAA driver came to do the tow. When he saw where the battery guy recommended he said they recommended certain businesses that are essentially AAA approved but the last person he sent there he had to be towed a week later from the repair place and he ended up taking his car here to Diaz Auto Mechanic. It was the best decision I could've made. There was nothing wrong with the alternator it just needed a new battery. They could have lied and took me for a bunch of money I didn't have but they are honest and I appreciate that. If I don't have to bring my vehicles any where else I will not. I'm a single white woman and my entire life I've been hosed in repairs in everything from cars to household repairs. When I find some I can trust I will not go anywhere else and I recommend them everyone I know. This is that place for car repairs. It's a completely added bonus that their prices are more reasonable than anywhere else.

In November 2025 I took my 07 nissan 350z into this shop because I started have idle issues. The…read morecar would shutter as if it wanted to shut off. The car would still would idle within spec. They diagnosed it said let's start with a spark plug ,throttle body cleaning and throttle relearn. These services would cost over 700 dollars. I agree to the services. 2 weeks later I pick up my car to a undrivable surging idle. The car is reving up and down on its own. I pay for the services he provided, spark plug and throttle body cleaning. It cost me over 500 dollars. The mechanic said some one else was working on the car. I've owned the car for about three years and done nothing but oil changes and brakes. Took my car to so cal Z in Colton and the diagnosed it top to bottom and said your 1st problem was a simple vacuum leak. Then your 2nd problem was damaged throttle bodies and your 3rd problem is 2007 nissan 350z ecu is very fussy and will need to get sent off to be reprogrammed. Picked up the car 2 weeks later. The car is still has a high idle but much closer to spec gave it some time for the ecu to relearn. Performed a couple throttle relearns on my own and the car is back to normal. Now the biggest problem I have here is that im out of 3000 dollars for a simple vacuum leak

Yes! Absolutely use them for transmission help. Very happy…read morewith service and care received. Sal is great! Called and responded back quickly. Was patient and willing to discuss situation via phone call. I was able to describe my issues with transmission and he went over scenarios and possible solutions. Called a few places and price was comparable. But service is definitely top notch. They even offer free tow service, which no other company offered. Sal came personally and picked up car and was even went above and beyond to help drop me off somewhere on the way to his shop. Service was quick. He quoted a week to week and half and was done in a week. Best part at the end was,he even picked me up from home to get car from shop. He definitely earned my business and recommendations. Everyone should definitely use Rancho Transmission

My engine light was on so my regular mechanic which has good reviews on yelp scope my 2007 yukon,…read moreand told me that the transmission was failing .he informed me that the transmission was bad and recommend me to rebuild my transmission. after searching for the best reviews on yelp i found sal from Rancho transmissions .so i towed my yukon to Rancho transmission and meet Sal .after leaving it there for a day Sal called me and told me that my transmission was fine.and there was no problems with it at all ... I was surprised ! sal was very honest and didnt even charge me a penny.my regular mechanic couldn't and misdiagnosed the problem...thank you sal for being honest and saving me thousands of dollars...