The Best GMC Repair in Knoxville, AL

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

#1

Walker Diesel & Performance

4.8
(180 reviews)
Verified

Widely regarded as the premier diesel and performance shop in Walker County. They specialize in complex diagnostics and repair of Duramax engines and Allison transmissions, with a strong focus on performance upgrades and heavy-duty towing systems. Their technicians have deep, specific expertise that general mechanics lack.

1601 Highway 78 E, Jasper, AL 35501

Specialties & Features

Duramax diesel service
Allison transmission repair
Heavy-duty towing package maintenance

Business Information

Years in Business:12 years
Licensed:Yes
Insured:Yes
#2

Jasper Transmission & Automotive

4.6
(150 reviews)
Verified

A long-standing, reputable shop known for its transmission expertise, particularly with the Allison series common in GMC trucks. They offer comprehensive automotive service, making them a strong choice for both transmission-specific issues and general GMC maintenance, including 4WD system service and EcoTec engine diagnostics.

1404 3rd Ave, Jasper, AL 35501

Specialties & Features

Allison transmission repair
4WD system service
EcoTec engine diagnostics

Business Information

Years in Business:25 years
Licensed:Yes
Insured:Yes
#3

Sumiton Automotive & Diesel Repair

4.5
(90 reviews)
Verified

A well-respected, full-service shop located very close to Knoxville. They provide a balanced service portfolio, handling everything from routine maintenance on Denali models to more complex diesel and drivetrain work. They are known for their customer service and are a reliable local option for GMC owners.

65 Main St, Sumiton, AL 35148

Specialties & Features

Diesel engine service
General GMC maintenance and diagnostics
Towing system service

Business Information

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

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

** The GMC repair market serving Knoxville, AL, is characterized by a small number of highly specialized, high-quality independent shops located in the surrounding commercial hubs of Jasper and Sumiton. Due to the rural and industrial nature of Walker County, there is a strong emphasis on diesel (Duramax) and transmission (Allison) expertise to serve the significant population of HD trucks used for farming, logging, and towing. **Average Quality:** The quality of specialized repair is high, as these shops compete on expertise rather than price alone. They cater to a clientele that depends on their vehicles for work and requires reliable, durable repairs. **Competition Level:** Competition is moderate but specialized. There are several general mechanics, but only a handful of shops possess the specific tools, software, and technician certifications for advanced diesel and transmission work. The shops listed above are consistently the top-rated and most recommended. **Typical Pricing:** Pricing is in line with regional averages for specialized auto repair. Diesel and transmission work commands a premium due to the complexity and cost of parts. Hourly labor rates are typically between $115 - $150 per hour. Customers report that while these top shops are not the cheapest option, they are considered a value due to their expertise and the longevity of their repairs.

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 Knoxville regulations and climate