The Best GMC Repair in Sumner, ME

Compare the highest-rated gmc repair mechanics in Sumner, Maine. All shops are licensed, insured, and verified through our rigorous screening process.

#1

Oxford Hills Auto & Truck

4.7
(180 reviews)
Verified

A well-established, family-owned service center known for its deep expertise in both domestic cars and heavy-duty trucks. They are a local go-to for complex diesel and transmission work, with several ASE Master Certified technicians on staff. Their shop is equipped to handle everything from routine EcoTec service to major Duramax engine overhauls and Allison transmission rebuilds.

1120 Main Street, Oxford, ME 04270

Specialties & Features

Duramax diesel service
Allison transmission repair
Heavy-duty truck suspension

Business Information

Years in Business:15 years
Licensed:Yes
Insured:Yes
#2

Purely Diesel & Offroad

4.9
(95 reviews)
Verified

This is a premier specialty shop focused exclusively on diesel performance and repair, with a stellar reputation for Duramax expertise. They are the top choice for owners of GMC HD trucks requiring performance tuning, complex diagnostics, and off-road suspension modifications. Their clientele includes many who use their trucks for heavy towing.

642 Roosevelt Trail, Windham, ME 04062

Specialties & Features

Duramax diesel service
4WD and towing system service
Heavy-duty truck suspension

Business Information

Years in Business:8 years
Licensed:Yes
Insured:Yes
#3

Lee's Family Auto

4.5
(220 reviews)
Verified

A highly trusted, long-standing full-service garage with a strong reputation for honesty and comprehensive diagnostics. While not a diesel-specific specialist, they have extensive experience with GMC's gasoline engines, including the EcoTec series, and are proficient in transmission service, 4WD systems, and electronic diagnostics for Denali models. They are a excellent all-around choice for non-diesel GMC maintenance and repair.

221 Pine Street, Lewiston, ME 04240

Specialties & Features

EcoTec engine diagnostics
Transmission repair
Denali luxury features and electronics

Business Information

Years in Business:25 years
Licensed:Yes
Insured:Yes

Why These Are the Top GMC Repair Auto Repair Shops in Sumner

** The GMC repair market serving Sumner, Maine, is characterized by a reliance on regional specialists rather than in-town dealers or shops. As a rural community, the demand is skewed towards servicing the robust capabilities of GMC trucks, particularly their diesel powertrains, all-wheel-drive systems, and towing components. The competition is moderate, with a handful of highly skilled independent shops dominating the high-complexity repair segment. These specialists often have wait times for non-emergency service, a testament to their reputation and the high demand for their expertise. General auto repair shops are abundant but lack the specific tools and training for advanced GMC systems like the Duramax/Allison combination. Pricing is competitive for the region, with labor rates typically ranging from $110-$150/hour. Specialized diesel and transmission work commands a premium due to the required expertise, but remains significantly more affordable than the nearest GMC dealerships, which are located in Portland or Augusta.

High Ratings

4.7+ star average from verified customer reviews

Fully Licensed

All shops are properly licensed and insured

Proven Experience

10+ years average experience in the industry

Local Experts

Familiar with Sumner regulations and climate