Top 3 GMC Repair Shops in Marathon Shores

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

#1

Marathon Tire & Auto Service Center

4.8
(287 reviews)
Verified

A full-service, family-owned automotive center known for its highly skilled technicians and ability to handle complex diagnostics and repairs on both gas and diesel domestic trucks. They are a top-tier provider for the entire Middle Keys community.

11499 Overseas Hwy, Marathon, FL 33050 (Serves Marathon Shores)

Specialties & Features

Duramax diesel service
Allison transmission repair
4WD and towing system service

Business Information

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

Keys Diesel & Marine

4.7
(134 reviews)
Verified

As the name implies, this shop specializes in diesel engines for both automotive and marine applications. They are the go-to experts for complex Duramax engine diagnostics, performance issues, and maintenance in the Keys.

4951 5th Ave, Marathon, FL 33050 (Serves Marathon Shores)

Specialties & Features

Duramax diesel service
EcoTec engine diagnostics
heavy-duty truck suspension

Business Information

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

Marathon Transmission & Auto Repair

4.6
(89 reviews)
Verified

A specialist shop with a strong reputation for solving complex transmission problems. They have specific expertise with the Allison transmission series common in GMC trucks and SUVs, as well as the newer 10-speed models.

12499 Overseas Hwy, Marathon, FL 33050 (Serves Marathon Shores)

Specialties & Features

Allison transmission repair
10-speed transmission service
towing package maintenance

Business Information

Years in Business:20 years
Licensed:Yes
Insured:Yes

Why These Are the Top GMC Repair Auto Repair Shops in Marathon Shores

** The GMC repair market in Marathon Shores is an extension of the broader Marathon, FL market. It is a specialized, high-trust environment where reputation and technical expertise are paramount. Due to the geographic isolation of the Florida Keys, residents rely heavily on local, independent shops rather than dealerships (the nearest GMC dealer is over an hour away in Key West or Homestead). **Average Quality:** The quality of top-tier shops is exceptionally high. These businesses have survived for decades by building trust and delivering reliable service, especially critical for vehicles used for towing boats and commercial purposes. **Competition Level:** Competition is moderate but specialized. There are several general auto repair shops, but only a handful possess the specific diagnostic equipment and technician training for complex GMC systems like Duramax engines and Allison transmissions. The shops listed above are the recognized leaders in their respective niches. **Typical Pricing:** Pricing is generally 15-20% higher than mainland averages due to the increased cost of parts shipping and business operations in the Keys. However, customers widely acknowledge this premium in exchange for expert, local service that avoids the time and expense of a 100+ mile tow to the nearest dealership. A standard service for a Duramax or transmission issue can easily range from $500 to $2,500+, depending on the complexity.

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 Marathon Shores regulations and climate