I needed to have my Exotic car's DMV exhaust certification renewed. The car is an 1988. I have…read morequite a bit of angst when every two years the certification has to be renewed. I took the car to TRISTAR. They were WONDERFUL!! They felt my concern. The car passed with flying colors, twice at this time! The people who own/work at Tristar are master mechanics! They were kind enough to give me a referral for an excellent Exotic car repair shop. Since moving to Sonoma County eight years ago I have been in convulsions on where to take my car for engine repairs. Tristar's recommendation was another star on their rating. They should receive 10 stars!!!

I asked that they check my car before I left for a road trip. They were very busy but worked me in…read moreso I could keep to my scheduled departure date. They did a beautiful job & fixed all the concerns I had. I've found my new shop. I will be going there for all my automotive needs. You will be pleased. Patricia B.

DISHONEST THIEVES! DO NOT USE THIS FAMILY RUN BUSINESS! They stole $6000 from me and did not fix…read moremy van! I took my van in to have the transmission fixed August 8, 2025. It was shuddering, and the check engine light was coming on. I was notified it was "fixed" about a week later. I paid $6000 and took the van. It was still doing the same shuddering and check engine light coming on. I told Dylan and he said, "oh it will just go away when you drive it more". A lie. Any mechanic knows things just don't "go away". It went back to the shop to be "fixed". About 2 weeks later it was returned and I was told its "fixed". I drove the van to Lake Tahoe and it was shuddering and dong the same thing as when I brought it in the very first time, not fixed! After a week in Tahoe they reluctantly came and drove it back to Santa Rosa. This back and forth went on for about 2 1/2 months. I paid $6000 and the van is still operating the exact same way it did when I brought it in August 8th. I called the Bureau of Automotive Repair and they went to the shop and verified the van is not fixed and told the owner, Dylan, to return my van AND my $6000, (per my request) because the job was NOT done. Dylan said he will return the van on October 31st, but refused to return my money. When the Bureau of Automotive Repair tells a shop owner to return money because they didn't perform the service that was paid for, you know that business is corrupt and needs to be shut down. It is October 29, 2005 and I asked for the van back and my $6000 I paid 2 months ago, because the van runs exactly the same as when I brought it in, it's NOT fixed. I spent over $7000 on hotels because I do not live in Santa Rosa, as well as lost work, as well as an unbelievable amount of stress. Aside from not fixing the van, I had to constantly call the shop to get updates, they rarely called me to update me as to what is going on. Its like they put the van in the back and didn't care to fix it because they already had my money! Meanwhile my hotel bills were piling up. Vaughan's Transmission and Auto Repair took my $6000 and didn't fix the problem I hired them to fix. THAT IS THEFT! DISHONEST FAMILY, DISHONEST BUSINESS! I will be suing for damages, unreasonable time for hotel costs, as well as loss of work because of this incompetent business. DO NOT USE THESE INCOMPETENT PEOPLE! Feel free to contact me me for more.

Great people and Great service! I recommend them to anyone who's having issues with their cars…read moresince i've taken my car there!

Nor Cal has the reputation of being the best transmission shop in Sonoma County because that's what…read morethey are. Don recently helped me with my 71 year old truck transmission. He made some recommendations, did the necessary work, made it safe, reliable, easy to drive again and for a great price.

These guys may-be one of the most honest/solid workplaces I've ever experienced. Spoke to the owner…read moreabout having my truck transmission looked at because it had thrown a code and went into limp mode. I opted for a tow package transmission package, and the guys at Nor-Cal delivered. The owner was very transparent and got me my truck back on time and went above and beyond. Glad to call myself a customer at Nor-Cal transmission.

Roman is honest, advising me not to spend too much money on my car. It's a lemon, but I'm trying…read moreto eke out as much life as I can from it. He diagnosed and fixed 2 very tricky issues before the end of the day. Would definitely recommend!

Extremely honest, great price, excellent communication during the process and fast, no upselling…read more Greg knew it was for my teen son, he replaced the transmission and gave me tips on what else was needed in the future. ZERO pressure! Can't recommend this shop enough. Thank You!

Best of the best! The team: Fernando, David, Desiree (And…read morethe guys hiding in the back). Honest, Professional and Clean! (After dealing with another goof ball in Santa Rosa) My experience with this team was nothing but Excellent! I am an extremely picky person and a perfectionist... And I am completely satisfied! Old school values put to use very well. (Very impressive) I feel I paid a fair price for all the work done on my 2000 Toyota 4 runner Supercharged (5 speed Manual Transmission). This team is the best of the best! I would like to name the unprofessional idiots in Santa Rosa but I will refrain at this time. I will tell everyone and my friends to take their vehicles to Rohnert Park Transmission. And for the folks I don't like.... I will send them to the other goof balls. Thanks again to Fernando and his professional team! It was nice working with you!

I keep it simple. Amazing service from the moment I walked into the door, professional and…read morestraightforward. Would recommend this business to anybody! Thank you very much for the great service.

Great service at small business value! On site is the place to repair and maintain your vehicles!read more

Honest, fast, professional and flexible. I'm so glad I found this shop. No wishy-washy sketchy…read morepricing, excellent customer service, speedy work. I will recommend these guys to everyone I know

I had my 86 Corvette at a shop in Santa Rosa for engine and transmission replacement. The…read moretransmission was taken to SR Hydramatic for rebuilding with a shift kit installation. When I received the car i complained that it shifted sluggish and could not tell shift kit was installed. Within a year the torque converter failed. Took it back and they serviced and replaced the torque converter. This car had less than 2500 miles on rebuilt tranny and engine. I drove it to my new home in San Tan Valley Az, 770 miles. Two days later 15 months after SR Hydramatic had serviced and replaced torque converter it failed again. Steve the shop owner insisted someone had messed with the throttle cable adjustment which he insisted was the cause of the first failed torque converter. NO ONE HAD TOUCHED THE THROTTLE CABLE AND STEVE REFUSED TO ACCEPT IT AS HIS BAD REBUILD I took the car to a shop in Queen Creek Az with reputable trained technicians, i asked them to examine the tranny. The torque converter failed was literally fried as well as the bands and bushings. THE MAIN CAUSE OF THE FAILED TRANSMISSION WAS DUE TO SR HYDRAMATIC INSTALLED AN UNDERSIZED PUMP WHICH WAS DESIGNED FOR A 6 CYLINDER ENGINED. THIS CAUSED EXCESSIVE HEAT WHICH FRIED THE TRANNY I HAD CALLED STEVE SEVERAL TIMES AND LEFT MESSAGES FOR HIM TO CALL ME SO I COULD TELL HIM WHY TRANNY FAILED. HE WOULD NOT ACCEPT MY CALLS OR CALL ME BACK SR HYDRAMATIC DOES NOT REBUILD TRANSMISSIONS ACCORDINGLY TO SPECIFICATIONS. PLEASE DO NOT HAVE THEM WORK ON YOU TRANSMISSION The repair shop i used for engine and tranny replacement,!reimbursed me for the cost of having the transmission rebuilt in Queen Creek Az. Thank you Wayne owner of Wayne and Sons Automotive Repair in Santa Rosa, Ca

This shop is GREAT!!! How often can you say you thoroughly enjoyed having your car serviced…read more.. personable, capable & reasonable! I learned the importance of changing my transmission fluid...something my father neglected to mention as he emphasized changing the oil frequently.! I love this place & highly recommend Carmen Caruso

I really really appreciate Justin and the way he handles customers. The other guy is not as…read morepersonable, but I feel like my cars are in good hands. Transparent. I like them so much I kind of don't want to post how happy I am with them - I believe the kids call it gate keeping ;)

20+ years of trust and appreciation. Eric and team have always been 100% honest and trustworthy…read more Deep in Automotive knowledge and techniques and at time surprisingly simple.