Auto Clinic
“Best shop in rockford Brad and his crew go above and beyond every single time we come in.”
Best Engine Repair & Rebuild in Rockford, IL
15 technicians listed · 7 in Rockford · 2 open weekends · all 15 rated 4.5+
Data verified October 20, 2026
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T J's Auto Center Inc
“We trust TJ's to give us good service and honest appraisals of our vehicles.”
Tire Tracks
“Car is running much better and customer service was excellent keep up the good work!”
Marks Auto Service
“Took care of my car in a timely manner as well as great customer service.”
Precision Automotive Diesel
“From a 1 cylinder to a 16 cylinder engine your remachining/rebuilding needs will be met.”
#thecrossover Motorsports
“They fixed my car faster than I hoped for and they did a very good.”
Listed for drivers in and around Rockford, IL, these 15 shops repair, rebuild and replace engines. What each one says about machine work, warranty terms and the engines it supplies comes from its own website; ratings and quotes come from public reviews.
Area overview: Rockford, IL
7 of the 15 technicians we list are based in Rockford; the other 8 serve Rockford from towns including Belvidere (11 mi), Machesney Park (8 mi) and Byron (13 mi). The technicians on this page are rated from 4.5 to 5.0 across 2,842 reviews; 9 have 50 or more reviews. The topics that come up most in reviews of the technicians on this page are "price", "fair" and "quality". 2 are open on Saturdays. 1 lists staff certifications (ASE) and 4 have a BBB rating of A or A+. Domain records put 8 websites of the technicians on this page at ten or more years old; the oldest dates from 2004. 3 offer financing; 1 gives free estimates; 1 is family- or locally-owned and 2 list coupons or special offers. We have a website on file for 12 of the technicians on this page; 11 publish a contact page and 2 list a public email. We count these figures across the technicians on this page; distances are straight-line, and hours and prices change, so confirm the details with the technician before you visit.
Why do some listings show another city?
7 of the 15 shops are in Rockford itself and the rest come from other towns within 15 mi. An engine job means leaving the car for days, so the drive happens once at each end rather than every morning.
Frank Musso's Automotive Repair
“He saved me thousand of dollars and had same day service & my car is now running fantastic.”
Boone County Transmissions
“He rebuilt the transmission on my Jeep Wrangler back in 2003, and since then he's been my go-to guy for all of my vehicles.”
Altamore's Automotive Service
“They have been doing all of our vehicles for over 10 years now and I won't go anywhere else.”
L & M Garage
“Five stars for work done and for having the doggos wandering around.”
Dan's Diesel Performance
“Ordered TCM from Dan and had it in 2 days truck shifts smooth and works awesome thank you.”
Anderson Automotive
“Just a wonderful group of guys they're very professional at what they do fixing cars once they fixed it it stays fixed”
Greg's Garage
“The experience and knowledge that the team of Ron and Steve have is by far the best around”
Hardcore Euro
“Had a full stage 1 engine build done on my broken RS3 and it has transformed the car!”
R&R Auto & Diesel Repair
“If you need a local gas or diesel mechanic who you want to treat you fair, this is the place to go.”
Why these companies made our list
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