Reliance Autocare
“My wife and I have had our autos serviced here for 25 years and Daren as the new owner has continued the prompt, reliable, knowledgeable, and reasonably priced service we received when Roland & Dave were running the garage.”
Best Transmission Repair Shops in Nashua, NH
15 mechanics listed · 7 in Nashua · 3 open weekends · all 15 rated 4.5+
Data verified October 18, 2026
Gurney's Automotive Repair
“Everyone was great, they gave me a detailed review of the report (with photos), and all around it was a very pleasant experience.”
H. Daw Service Station
“You might save a few bucks going somewhere else, but these guys are friendly, honest, and will get the job done right the first time.”
PDM Auto Service
“I've been going here for years, and can personally vouch for them.”
Lowell Street Automotive
“I trust Lowell Street Automotive with my cars because they do a great job of keeping them running well and safely, while being mindful of cost.”
Nashua Sunoco Auto Repair
“Very knowledgeable mechanics that do the job correctly and are reasonably priced.”
Listed for drivers in and around Nashua, NH, 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: Nashua, NH
Of the 15 mechanics we list here, 7 are in Nashua itself and 8 come from towns including North Chelmsford, MA (3, 10 mi), Merrimack (1, 7 mi) and Pepperell, MA (1, 7 mi). The mechanics on this page are rated from 4.5 to 5.0 across 2,197 reviews; 10 have 50 or more reviews. When customers rate these mechanics on specific qualities, they most often praise professionalism (82%), value (82%) and quality (68%). The topics that come up most in reviews of the mechanics on this page are "honest", "fair" and "communication". 3 are open on Saturdays. 2 list staff certifications (ASE) and 10 have a BBB rating of A or A+. 12 have ten or more years of experience, the longest 59 years. 1 offers financing; 2 give free estimates; 3 are family- or locally-owned and 8 list coupons or special offers. We have a website on file for 14 of the mechanics on this page; 11 publish a contact page; 3 list a public email and 3 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 12 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.
Holmes Auto Repair
“Honest workers that go above and beyond to help fix your cars problems.”
Serrano Auto Sales & Services LLC
“He also fixed something else that was wrong that I didn't know about and I loved that he did that for me.”
Service Plus Automotive
“When people ask where is a good place to go to get your car fixed, I tell them Service Plus!!”
Middlesex Tire & Auto Center
“Would not take my car anywhere else.”
J&R Auto Repair
“John had me bring the car right down and I had it fixed and back on the road by the next day.”
Mike Brailey's Auto Service
“Went right over and they got me in and got my sticker, total life saver because I needed to travel EARLY next morning to drive a few states over before a snow storm rolled in.”
Doctor Auto
“They did my breaks and the price was the best value around, my truck is running smooth.”
HM Motor Works
“They had let me know of some minor maintenance the car needs and were great in explaining what the car needed.”
Cowgill Auto Service
“Staff was able to look at other concerns for state inspection purposes and handled those issues with my 2007 vehicle right at the time.”
Why these companies made our list
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