The Best GMC Repair in Firth, ID

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

#1

Specialty Auto & Diesel Repair

4.8
(180 reviews)
Verified

A highly-rated, independent shop known for its deep expertise in both domestic and diesel powertrains. They are a trusted name for complex diagnostics and repairs on GM trucks, from routine maintenance on EcoTec engines to major overhauls on Duramax diesel and Allison transmission systems. Their technicians are known for their methodical problem-solving approach.

850 S Yellowstone Hwy, Idaho Falls, ID 83402 (Approx. 15 min drive from Firth)

Specialties & Features

Duramax diesel service
Allison transmission repair
4WD and towing diagnostics

Business Information

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

Dave Smith Motors Service Department

4.5
(250 reviews)
Verified

As the region's premier GMC dealership, Dave Smith Motors offers factory-trained technicians, genuine GM parts, and direct access to the latest technical service bulletins and programming. This is the definitive source for warranty work, complex electronics on Denali models, and factory towing package maintenance. Their shop is equipped with the specific diagnostic tools required for all modern GMC systems.

3013 S Yellowstone Hwy, Idaho Falls, ID 83402 (Approx. 15 min drive from Firth)

Specialties & Features

Denali luxury/electronics
EcoTec engine diagnostics
Factory towing package maintenance

Business Information

Years in Business:50 years
Licensed:Yes
Insured:Yes
#3

Ron's Auto Repair & Diesel Performance

4.7
(90 reviews)
Verified

Ron's has built a strong local reputation for honest, high-quality work on American trucks. They excel in mechanical repairs and are a go-to shop for suspension work, brake service, and engine diagnostics. They are a solid choice for GMC owners needing reliable service on heavy-duty suspensions and general powertrain work without the dealership price point.

Located in Idaho Falls, ID (serving the Firth area)

Specialties & Features

Heavy-duty truck suspension
EcoTec engine diagnostics
General GMC powertrain service

Business Information

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

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

** The GMC repair market serving Firth, Idaho, is characterized by a reliance on the larger, neighboring city of Idaho Falls. As a small agricultural community, Firth itself does not support a dedicated, specialized GMC repair shop. The competitive landscape is therefore concentrated in Idaho Falls, offering residents a healthy range of options from the factory-authorized dealership (Dave Smith Motors) to well-established, high-quality independent shops (Specialty Auto & Diesel, Ron's). **Average Quality:** The quality of service available is generally high. The dealership provides OEM-standard care, while the top independents offer expert-level, often more personalized service, frequently at a lower labor rate. **Competition Level:** Competition is moderate among the top-tier providers in Idaho Falls. This benefits the consumer, as shops compete on reputation, specialization, and customer service. For basic maintenance, there are many options, but for the specific complex needs of modern GMCs (especially Duramax, Allison, and Denali electronics), the field narrows to the 2-3 specialists identified. **Typical Pricing:** Pricing follows a standard tiered structure. Dave Smith Motors (dealership) commands the highest labor rates. Independent specialists like Specialty Auto & Diesel are typically 15-25% less expensive, while shops like Ron's offer a very competitive value. Parts markups can also be lower at independents. For a complex diesel injector replacement or transmission rebuild, consumers can expect a significant investment, but the availability of multiple qualified shops helps keep pricing fair.

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 Firth regulations and climate