The Best GMC Repair in Brockton, MT

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

#1

Northern Automotive & Diesel

4.7
(180 reviews)
Verified

A highly regarded, family-owned shop known for its expertise in diesel performance and repair. They are the go-to specialists in the region for complex Duramax engine diagnostics, performance tuning, and Allison transmission servicing. They cater extensively to agricultural and heavy-duty truck owners.

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

Tires Plus of Sidney

4.5
(90 reviews)
Verified

Part of a trusted national network but operated locally, this full-service center provides a wide range of repairs. They are well-reviewed for general GMC maintenance, EcoTec engine work, and 4WD system service. A reliable option for routine maintenance and common mechanical issues.

1200 S Central Ave, Sidney, MT 59270

Specialties & Features

EcoTec engine diagnostics
4WD and towing system service
General GMC maintenance

Business Information

Years in Business:10 years
Licensed:Yes
Insured:Yes
#3

Ressler GMC

4.3
(150 reviews)
Verified

As the area's authorized GMC dealership, Ressler offers the most direct access to factory-trained technicians, genuine GM parts, and the latest diagnostic software. This is the premier choice for warranty work, complex electronics, Denali luxury feature repairs, and factory towing package maintenance.

300 S Central Ave, Sidney, MT 59270

Specialties & Features

Denali luxury features and electronics
Factory towing package maintenance
GMC manufacturer certifications

Business Information

Years in Business:50 years
Licensed:Yes
Insured:Yes

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

** The GMC repair market serving Brockton, Montana, is characterized by its reliance on the larger service ecosystem in Sidney. Brockton itself lacks a dedicated, specialized GMC repair shop. The market in Sidney is moderately competitive but highly pragmatic, with a clear division of specialties. * **Average Quality:** The average quality of service is good to very good, with shops being experienced in the heavy-duty needs of a rural, agricultural community. Expertise in diesel and 4WD systems is common and expected. * **Competition Level:** Competition is not based on price alone but on reputation and specialized capability. Northern Automotive & Diesel dominates the high-end diesel and performance segment, while Ressler GMC holds the franchise authority for complex electronics and warranty work. Independent shops like Tires Plus fill the vital role of general maintenance and more common repairs. * **Typical Pricing:** Pricing is generally in line with regional norms. Dealership (Ressler) labor rates are typically the highest, followed by specialized independents (Northern Automotive & Diesel), and then general service centers. Customers are generally willing to pay a premium for proven expertise in critical systems like the Duramax engine and Allison transmission.

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 Brockton regulations and climate