The Best GMC Repair in Sumatra, MT

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

#1

Forsyth Auto & Diesel Repair

4.7
(180 reviews)
Verified

A long-standing, family-owned shop widely regarded as the leading diesel and heavy-duty specialist in the region. They have a reputation for tackling complex diagnostics on modern GMC trucks, from classic Duramax engines to the latest electronic and towing systems. Their technicians are known for their practical, no-nonsense approach to repairing vehicles built for Montana's demanding terrain and work.

905 Front St, Forsyth, MT 59327 (Approx. 30 miles from Sumatra)

Specialties & Features

Duramax diesel service
Allison transmission repair
Heavy-duty truck suspension

Business Information

Years in Business:22 years
Licensed:Yes
Insured:Yes
#2

Miles City Tire & Auto Service

4.5
(220 reviews)
Verified

A well-equipped, multi-service center that acts as a primary service provider for a large swath of eastern Montana. They have specific certifications and training that make them a go-to for GM transmissions and 4WD systems. Customers frequently praise their ability to handle everything from routine EcoTec engine maintenance to complex transmission rebuilds on heavy-duty pickups.

1015 S Haynes Ave, Miles City, MT 59301 (Approx. 60 miles from Sumatra)

Specialties & Features

Allison transmission repair
4WD and towing system service
EcoTec engine diagnostics

Business Information

Years in Business:18 years
Licensed:Yes
Insured:Yes
#3

B&B Repair

4.6
(95 reviews)
Verified

A highly-rated, independent mechanic shop known for its expertise in General Motors vehicles. While they handle all-around auto repair, their deep familiarity with GM platforms makes them an excellent choice for diagnostics on Denali electronics, towing package modules, and engine performance issues. They are known for personalized service and are a trusted local option for intricate electrical work.

504 Cedar St, Forsyth, MT 59327 (Approx. 30 miles from Sumatra)

Specialties & Features

Denali luxury features and electronics
Towing package maintenance
EcoTec engine diagnostics

Business Information

Years in Business:12 years
Licensed:Yes
Insured:Yes

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

The GMC repair market serving Sumatra, Montana, is characterized by a reliance on robust, independent shops in larger neighboring towns like Forsyth and Miles City. There are no dedicated GMC dealerships nearby, creating a niche filled by these highly capable third-party specialists. The competition level is moderate but specialized; shops compete on reputation for handling complex diesel, transmission, and 4WD issues rather than on price alone. The average quality of service is high, as these businesses survive by being able to service the demanding needs of agricultural, ranching, and towing customers who depend on their GMC trucks as essential tools. Typical pricing is in line with regional averages, with labor rates generally lower than in major metropolitan areas but parts costs being comparable. Customers prioritize proven expertise and reliability over convenience, leading to strong loyalty towards shops that demonstrate deep technical knowledge of the GMC platform, particularly the Duramax/Allison powertrain combination.

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 Sumatra regulations and climate