The Best GMC Repair in Westby, MT

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

#1

R & M Service & Performance

4.8
(180 reviews)
Verified

A highly respected, family-owned diesel and transmission specialist known for its technical expertise and honest service. They are the go-to shop in the region for complex diagnostics and performance work on Duramax-equipped trucks, from routine maintenance to major repairs.

901 S Central Ave, Sidney, MT 59270

Specialties & Features

Duramax diesel service
Allison transmission repair
Heavy-duty truck suspension

Business Information

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

Certified Auto Repair & Performance

4.6
(120 reviews)
Verified

A well-established shop with multiple ASE and manufacturer-specific certified technicians. They offer a comprehensive range of services from advanced engine diagnostics to full transmission rebuilds, making them a strong all-around choice for GMC owners.

312 3rd St SW, Sidney, MT 59270

Specialties & Features

EcoTec engine diagnostics
Transmission repair (Allison
10-speed)
4WD and towing system service

Business Information

Years in Business:12 years
Licensed:Yes
Insured:Yes
#3

Tires Plus of Williston

4.4
(250 reviews)
Verified

Part of a trusted national network but operated locally, this provider offers consistent, high-quality service with a focus on general maintenance and complex electrical systems. They are a reliable option for Denali electronics, towing package maintenance, and suspension work, backed by strong corporate support and warranty.

102 15th St W, Williston, ND 58801

Specialties & Features

Denali luxury features and electronics
Towing package maintenance
Heavy-duty truck suspension

Business Information

Years in Business:20 years
Licensed:Yes
Insured:Yes

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

** The GMC repair market serving Westby, Montana, is characterized by a reliance on nearby commercial hubs, primarily Sidney, MT (approx. 30 miles west), and Williston, ND (approx. 50 miles east). There are no dedicated GMC dealerships or exclusive GMC specialists within Westby itself. The competitive landscape is therefore defined by independent shops in these neighboring towns that have developed strong regional reputations for servicing the agricultural and oilfield-related fleet vehicles, which are predominantly heavy-duty GM trucks. **Average Quality:** The quality is generally high, as these shops must compete for business from knowledgeable commercial and private clients who demand durability and expertise, especially with complex diesel and transmission systems. **Competition Level:** Competition is moderate but specialized. While there are several general auto repair shops, only a handful possess the specific diagnostic tools, technician certifications, and deep experience required for advanced GMC systems like the Duramax and Allison. This creates a niche for the top providers. **Typical Pricing:** Pricing is competitive with national averages but can be slightly higher for specialized diesel work due to the expertise required and the local demand. Expect labor rates in the $120-$150/hour range. Given the lack of a local dealership, customers avoid premium dealership labor rates but still pay for expert-level independent shop service.

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 Westby regulations and climate