The Best GMC Repair in Union, MI

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

#1

Dave's Auto & Truck Repair

4.8
(180 reviews)
Verified

A highly respected, family-owned shop known for its deep expertise in diesel engines and heavy-duty truck systems. They are a go-to for complex diagnostics and major repairs on Duramax-equipped GMC trucks, from the 2500 to the 3500 series. Their reputation is built on transparency, quality workmanship, and tackling jobs other shops turn away.

26251 M-60, Union, MI 49130

Specialties & Features

Duramax diesel service
Allison transmission repair
Heavy-duty suspension

Business Information

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

A-1 Transmission Center

4.7
(120 reviews)
Verified

While the name suggests a narrow focus, A-1 has built a stellar reputation for being the regional expert on Allison transmissions, which are critical to GMC HD trucks. They perform everything from fluid services and TCU programming to full rebuilds. Their expertise extends to the modern 10-speed automatics found in newer models and they are well-versed in the related 4WD and towing system electronics.

1204 S Centerville Rd, Sturgis, MI 49091 (Serves the Union area)

Specialties & Features

Allison transmission repair
10-speed transmission service
Towing package maintenance

Business Information

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

Union Auto Repair

4.5
(90 reviews)
Verified

This local shop provides reliable, generalist service for the Union community with specific competencies that align well with GMC needs. They are a strong choice for routine maintenance, EcoTec engine diagnostics on smaller SUVs and pickups, and electronic troubleshooting for common Denali features. They offer a personal touch and are known for their honest assessments.

200 E Lafayette St, Union, MI 49130

Specialties & Features

EcoTec engine diagnostics
Denali luxury features and electronics
General GMC service

Business Information

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

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

The GMC repair market in and directly serving Union, Michigan, is characterized by a handful of established, independent shops rather than a high volume of specialized competitors. The quality is generally high, with these businesses competing on reputation and technical competence rather than price alone. Due to Union's size, true specialists for complex issues like Duramax or Allison transmissions are found in the broader St. Joseph County area, but they are well-known and accessible to Union residents. Pricing is competitive with regional averages; expect to pay $120-$150/hour for labor at a reputable independent shop, which is significantly less than a dealership. For major diesel or transmission work, the investment is substantial, but the expertise of the top providers justifies the cost by ensuring the job is done correctly the first time. Customers are advised to book appointments in advance, especially for specialized shops, as their schedules can fill up quickly.

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 Union regulations and climate