The Best GMC Repair in New Harmony, UT

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

#1

The Diesel Specialist

4.8
(240 reviews)
Verified

A highly regarded, family-owned shop exclusively focused on diesel performance and repair. They are the go-to experts in Southern Utah for Duramax engines and Allison transmissions, known for their diagnostic precision and work on heavy-duty trucks used for serious towing.

245 N. 2170 W., St. George, UT 84770

Specialties & Features

Duramax diesel service
Allison transmission repair
Heavy-duty truck suspension

Business Information

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

St. George Transmission & Automotive

4.6
(180 reviews)
Verified

While the name highlights transmissions, this shop provides comprehensive automotive care with a renowned expertise in both Allison and the newer GM 10-speed transmissions. They also have advanced diagnostic tools for EcoTec engines and are well-versed in the integrated towing systems on modern GMCs.

1588 S. Business Park Dr., St. George, UT 84770

Specialties & Features

Transmission repair (Allison
10-speed)
EcoTec engine diagnostics
Towing package maintenance

Business Information

Years in Business:18 years
Licensed:Yes
Insured:Yes
#3

Gentry's Service Center

4.5
(150 reviews)
Verified

A long-standing, full-service shop known for its honest service and broad technical capabilities. They are particularly adept at handling the full spectrum of GMC vehicles, from Denali trim electronics and luxury features to 4WD system service and general maintenance.

75 N. 1100 E., St. George, UT 84770

Specialties & Features

Denali luxury features and electronics
4WD system service
General GMC maintenance
diagnostics

Business Information

Years in Business:22 years
Licensed:Yes
Insured:Yes

Why These Are the Top GMC Repair Auto Repair Shops in New Harmony

** The GMC repair market serving New Harmony, Utah, is almost entirely centered in the St. George area. The market is characterized by a handful of highly competent, independent shops that have built strong reputations over decades, as the local economy is heavily supported by agriculture, construction, and tourism, all of which rely on capable trucks. There is a notable absence of dedicated GMC-only specialists, but the top providers have carved out specific niches (diesel, transmission, general service) where they excel. Competition is healthy but not oversaturated, leading to a high average quality of service as shops must maintain excellent reputations to thrive. Pricing is generally competitive with national averages but can be premium for specialized diesel and transmission work, reflecting the high level of expertise required. For New Harmony residents, accessing top-tier GMC service is convenient, requiring a short commute to St. George to find providers capable of handling everything from routine EcoTec service to complex Duramax and Allison 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 New Harmony regulations and climate