Auto Squad DB
“Matthew's one of the best well known guys in the industry in this side of SoCal and if he can't give you the right advice he will reach out to one of his certified technician's.”
Best Transmission Repair Shops near Diamond Bar, CA
We have 2 mechanics in Diamond Bar on file, and both are on this list, along with 13 from towns including Pomona (1, 5 mi), Rowland Heights (1, 5 mi) and Brea (1, 6 mi).
7 open weekends · 13 rated 4.5+ · 2 show a license
Data verified October 16, 2026
Diamond Bar Auto Service & Body
“I went back here and ran into the boss and he did an engine check, told me the issue was my car needed to warm up essentially since we've been having cold weather and explained some other things to me, and sent me on my way with no charge.”
Reliable Smog Saint Anthony Complete Auto Care
“Helpful and very friendly workers and from the name of the business it speaks clearly their the best The word trust keeping me stay with this shop and proud recommending to my friends and family.”
Imperial Tire Plus Wholesale INC
“Great service and was honest with me when I had questions about anything.”
B & D Auto Repair
“They only fix what's wrong, and don't try to tack on thousands of dollars of needless repairs like some other BS places.”
小李修車廠 KB Motor
“I got flat tire on the road and owner only took ten minutes to fix my tire🔥 professional and very patient👍🏼”
Listed for drivers in and around Diamond Bar, CA, these 15 shops work on transmissions. What each one says about rebuilds, warranty terms and the brands it handles comes from its own website; ratings and quotes come from public reviews.
Area overview: Diamond Bar, CA
The 15 mechanics on this page are rated from 4.3 to 4.9 across 4,072 reviews; 14 have 50 or more reviews and 13 are rated 4.5 or higher. The topics that come up most in reviews of the mechanics on this page are "price" and "honest". 7 are open on Saturdays. The services the mechanics on this page list most often on their websites are wheel alignment (3), auto repair (2), brakes (2), oil change (2) and transmission repair (2). 2 show a license on their websites; 4 list staff certifications (ASE) and 9 have a BBB rating of A or A+. Domain records put 9 websites of the mechanics on this page at ten or more years old; the oldest dates from 2004. 5 offer financing; 5 are family- or locally-owned and 9 list coupons or special offers. We have a website on file for 13 of the mechanics on this page; 10 publish a contact page; 10 list a public email and 6 take bookings online. We count these figures across the mechanics on this page; distances are straight-line, and hours and prices change, so confirm the details with the mechanic before you visit.
Do years in business matter for transmission work?
Ten or more years in business is claimed by 13 of the 15 shops here. Rebuild quality is hands-on skill, and a shop that has been in one place a long time is easier to hold to a warranty. It is what their listings state, not a guarantee.
Alonso's Auto Repair
“Price was reasonable would highly recommend”
Pomona Tire Pros Repair Shop
“Great experience here spoke w Jose got a quote, set a time & that was it!”
McBride's RV Service & Paint
“Nice people very professional the only rv shop I will use they are very on time with repairs”
Rancho Performance Transaxles
“Aside from the quality of work, David was great to communicate with from start to finish which is no easy task with a 3 hour time zone difference.”
Johnny's Auto Service
“Took my car here because I was having transmission issues, and they gave me some great advise/opinion on what I should do for a reasonable price.”
Comtires
“These guys get the job done fast.”
Abco Diesel Repair Shop
“They took us in, no appointment, got my truck up and running lickity split.”
Community Tire & Auto Service
“I highly recommend Community Tire & Auto Service in Brea.”
Yorba Linda Auto Service
“Yorba Linda Auto Service is a great place to take your car!”
Why these companies made our list
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