The Best GMC Repair in Lamar, IN

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

#1

Diedam's Service Center

4.8
(180 reviews)
Verified

A family-owned and operated business with a stellar reputation for honesty and expert work on domestic trucks. They are particularly renowned for their diagnostic capabilities and deep mechanical expertise on GM platforms, including complex diesel and transmission systems.

110 S Section St, Sullivan, IN 47882

Specialties & Features

Duramax diesel service
Allison transmission repair
Heavy-duty truck suspension

Business Information

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

Beck's Service Center

4.6
(220 reviews)
Verified

A highly trusted, long-standing service center known for its comprehensive approach. They handle everything from routine maintenance on EcoTec engines to advanced diagnostics for electronics and towing systems, making them a great all-around choice for Denali owners and work trucks alike.

201 N Main St, Carlisle, IN 47838

Specialties & Features

EcoTec engine diagnostics
Towing package maintenance
General GMC service
repair

Business Information

Years in Business:40 years
Licensed:Yes
Insured:Yes
#3

Sullivan Automotive & Diesel

4.5
(90 reviews)
Verified

A specialized shop that focuses on the intersection of automotive and diesel repair, which is ideal for GMC Sierra HD owners. They offer robust services for powertrain and drivetrain components, including 4WD system service and transmission work.

202 E Wolfe St, Sullivan, IN 47882

Specialties & Features

Diesel engine service
4WD system service
Transmission repair

Business Information

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

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

** The GMC repair market serving Lamar, IN, is characterized by a reliance on established shops in neighboring hubs like Sullivan and Carlisle. As an unincorporated community, Lamar itself does not host dedicated GMC dealerships or specialty shops. The competitive landscape is therefore regional. The average quality of service is high, as these long-standing, family-owned businesses compete on reputation and technical competence rather than price alone. Competition is moderate, with a few key players dominating the reputation space. Typical pricing is in line with independent shop rates for the Midwest, which is generally more affordable than dealerships. For the specialized services you've listed, expect a premium over standard repair work. For example, Duramax injector replacement or Allison transmission diagnostics will command higher labor and part costs due to the required expertise and equipment. Customers primarily choose based on word-of-mouth and proven track records with complex repairs, making the shops listed above the clear leaders for your specific GMC needs.

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 Lamar regulations and climate