Top 3 GMC Repair Shops in Long Key

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

#1

The Diesel Shop of the Keys

4.8
(180 reviews)
Verified

Widely regarded as the premier diesel specialist in the Florida Keys. They focus exclusively on diesel powertrains, making them the top choice for complex Duramax diagnostics, performance tuning, and repair. Their technicians have advanced training and proprietary tools specifically for modern diesel systems.

495 36th St, Marathon, FL 33050

Specialties & Features

Duramax diesel service
Allison transmission repair
Towing package maintenance

Business Information

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

Marathon Auto & Truck Repair

4.6
(250 reviews)
Verified

A full-service shop known for its ability to handle a wide range of issues on modern trucks and SUVs. They are a popular alternative to the dealership for general GMC maintenance and complex repairs. Their team is proficient in EcoTec engine diagnostics, electronic systems, and suspension work common on GMC Sierra and Yukon models.

11425 Overseas Hwy, Marathon, FL 33050

Specialties & Features

EcoTec engine diagnostics
4WD and towing system service
Heavy-duty truck suspension

Business Information

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

A1 Auto Electric & AC

4.5
(120 reviews)
Verified

While their name highlights electrical work, this shop has evolved into a top-tier specialist for the complex electronics and infotainment systems found in GMC Denali models. They are the go-to experts for diagnosing and repairing issues with onboard entertainment, driver assistance features, and climate control systems, in addition to performing general mechanical repairs.

31 Garden Cove Dr, Key Largo, FL 33037

Specialties & Features

Denali luxury features and electronics
Transmission repair (Allison
10-speed)
General GMC service

Business Information

Years in Business:9 years
Licensed:Yes
Insured:Yes

Why These Are the Top GMC Repair Auto Repair Shops in Long Key

** The GMC repair market for residents of Long Key is characterized by high specialization and reliance on neighboring communities. * **Average Quality & Competition:** The quality of service is generally high, driven by the demanding environment of the Keys (salt air, heavy tourist traffic, long-distance towing) and a clientele that depends on their vehicles for daily life and business. Competition is not saturated with generalists but features a few highly specialized shops that have carved out specific niches (e.g., diesel, electronics, general truck repair). * **Typical Pricing:** Pricing is above the national average, reflecting the higher cost of living, specialized expertise required for modern GMCs, and the cost of importing parts to the island chain. Labor rates are typically in the $130-$175/hour range. For major services like Duramax injector replacement or Allison transmission rebuilds, customers should expect estimates starting in the several thousand-dollar range. * **Key Consideration:** Due to the specialized nature of these shops, it is **highly recommended** to schedule appointments well in advance, especially before peak season (winter) or for complex diagnostics. The nearest GM dealerships are significantly farther away in Homestead, making these independent specialists a more convenient and often more knowledgeable option for specific GMC systems.

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 Long Key regulations and climate