The Best GMC Repair in Brookside, NJ

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

#1

A-1 Supreme Auto & Transmission Service

4.8
(240 reviews)
Verified

A family-owned and operated business with a stellar reputation for complex transmission and drivetrain work. They are frequently recommended for Allison transmission rebuilds and are known for their diagnostic expertise on modern GM vehicles, including diesel and EcoTec engines. Their technicians have deep experience with the 4WD systems and towing components on GMC trucks and SUVs.

1255 State Route 10 E, Randolph, NJ 07869

Specialties & Features

Allison transmission repair
Duramax diesel service
4WD and drivetrain diagnostics

Business Information

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

Denville Transmission & Auto Repair

4.7
(180 reviews)
Verified

Consistently rated as one of the top auto repair shops in Morris County. While "Transmission" is in their name, they are full-service specialists for domestic brands, with a significant portion of their work dedicated to GM trucks and SUVs. They have specific expertise in the 10-speed and Allison transmissions, Duramax engine service, and the electronic integration of towing systems and luxury features found in Denali models.

33 Broadway, Denville, NJ 07834

Specialties & Features

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

Business Information

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

The Auto Technician

4.9
(150 reviews)
Verified

A highly specialized, boutique-style shop known for taking on complex electrical and diagnostic cases that dealerships sometimes struggle with. They excel in modern vehicle electronics, making them an excellent choice for diagnosing and repairing advanced Denali luxury features, infotainment systems, and sensor-related issues. Their work on engine performance, particularly for EcoTec and diesel applications, is highly praised.

400 State Route 10, Ledgewood, NJ 07852

Specialties & Features

Denali luxury features and electronics
EcoTec
Duramax diagnostics
heavy-duty truck suspension

Business Information

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

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

** The GMC repair market serving Brookside, NJ is characterized by high-quality, independent specialists located in the surrounding towns of Randolph, Denville, and Ledgewood. Due to Brookside's affluent demographic and the prevalence of high-end trucks like the Sierra Denali, the local market demands and supports shops with advanced technical knowledge that can often surpass dealer service departments in both depth of expertise and personalized service. **Competition Level:** High, but segmented. There is strong competition among a handful of top-tier independent shops (like those listed) for complex mechanical and diagnostic work. General mechanics are abundant, but few possess the specific certifications and tooling for advanced GMC systems. **Average Quality:** The quality bar is very high. Shops that succeed in this market have built long-term reputations on technical competency and transparency. Customers are knowledgeable and expect their sophisticated vehicles to be repaired correctly the first time. **Typical Pricing:** Pricing is premium but competitive with dealerships, often offering better value. For the specialties requested, expect labor rates in the $150-$185/hour range. A complex Duramax injector replacement or an Allison transmission service will be a significant investment, but the expertise of these shops helps prevent misdiagnosis and repeat repairs, providing long-term value.

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 Brookside regulations and climate