The Best GMC Repair in Stonington, CT

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

#1

Stonington Automotive Service Center

4.8
(180 reviews)
Verified

A highly reputable, family-owned and operated shop known for its honest diagnostics and high-quality workmanship. They have built a strong reputation for handling complex repairs on American trucks and SUVs, with specific expertise in the GMC lineup. Their technicians are skilled in both powertrain and advanced electronic systems.

12 Liberty St, Stonington, CT 06378

Specialties & Features

Duramax diesel service
Allison transmission repair
Denali electronics
diagnostics

Business Information

Years in Business:25 years
Licensed:Yes
Insured:Yes
#2

Mystic Transmissions & Auto Repair

4.6
(220 reviews)
Verified

While "Transmissions" is in their name, this shop is a full-service facility with a renowned specialty in transmission repair and drivetrain systems. They are a top-tier choice for Allison transmission service and 4WD system diagnostics, making them ideal for GMC Sierra and Yukon owners, especially those who tow.

48 Harry Austin Dr, Mystic, CT 06355

Specialties & Features

Allison transmission repair
4WD and towing system service
EcoTec engine diagnostics

Business Information

Years in Business:15 years
Licensed:Yes
Insured:Yes
#3

GMC of Waterford (Service Department)

4.4
(290 reviews)
Verified

As the authorized GMC dealership, this is the premier destination for factory-trained technicians, genuine GM parts, and the most up-to-date technical service bulletins. They are unequivocally the best resource for warranty work, complex Denali luxury feature issues, and all recalls. Their service department is equipped to handle everything from EcoTec3 diagnostics to heavy-duty truck suspension on the Sierra HD.

897 Hartford Turnpike, Waterford, CT 06385

Specialties & Features

Denali luxury features and electronics
Factory towing package maintenance
Heavy-duty truck suspension

Business Information

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

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

** The GMC repair market in the Stonington, CT area is characterized by a mix of high-quality independent specialists and a major dealership presence in a nearby market. Stonington itself hosts a small number of excellent general repair shops, like Stonington Automotive, that have evolved GMC-specific expertise through long-term service to the community. For more specialized transmission and 4WD work, residents often look to the larger commercial corridor in neighboring Mystic. The competition level is moderate but of a generally high quality, with shops competing on reputation and specialized knowledge rather than price alone. Typical pricing reflects the coastal New England market, with labor rates ranging from **$130 - $175 per hour**. Independent specialists often provide a cost advantage over the dealership for non-warranty work, while the dealership (GMC of Waterford) offers the assurance of OEM parts and factory-specific tooling. For GMC owners, particularly those with diesel, Allison transmission, or Denali models, there are several excellent, reputable options within a short drive, ensuring access to expert care without needing to travel to a major urban center.

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 Stonington regulations and climate