Introduction
As a product engineer at Progress Mfg. Inc., specializing in trailer towing equipment, I have had the unique opportunity to rigorously test the 2017 GMC Sierra 3500 SLT 4×4 under extreme conditions. This review delves into the truck's performance, maintenance, and reliability, providing valuable insights for potential buyers and truck enthusiasts.
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Testing Environment and Methodology
Our testing primarily involves towing heavy trailers over steep and curvy mountain roads. The GMC Sierra 3500, equipped with a 6.6-liter turbo-diesel V-8 Duramax engine, has been subjected to elevations ranging from 4,600 feet to over 9,000 feet. The testing regimen includes hard acceleration, heavy braking, and driving on rough terrains, including gravel and dirt roads.
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Performance Under Pressure
Despite the harsh conditions, the Sierra 3500 has consistently performed admirably. However, it hasn't been without its challenges. Notably, we encountered a repeated coolant hose leak within the first 10,000 miles. The issue was resolved by replacing the factory spring clamp with a screw-type hose clamp, a simple yet effective solution.
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Transmission Overheating Incident
At over 6,000 miles, the truck displayed a transmission overheating warning while climbing a steep grade in 90-degree weather. The situation was managed by idling the engine, allowing the cooling system to mitigate the heat. This incident underscores the importance of understanding vehicle cooling systems, especially under heavy load conditions.
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Braking System Anomaly
An unusual braking anomaly occurred during a descent on a snowy 6 percent grade. The truck accelerated when the brake pedal was pressed, a situation rectified by using the trailer brake controller. A subsequent computer update resolved this issue, highlighting the importance of software in modern vehicle safety systems.
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Wear and Tear: Trailer Hitch Replacement
After approximately 20,000 miles, the trailer hitch receiver showed significant wear, necessitating a replacement. This level of wear is atypical for average consumers but is a testament to the rigorous testing environment the truck was subjected to.
Maintenance and Upkeep
Regular maintenance, including oil and oil filter changes, has been crucial in maintaining the truck's performance. The diesel fuel filter was replaced at 21,000 miles, a straightforward task that underscores the truck's user-friendly maintenance design.
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Fuel Efficiency and Tire Wear
The Sierra 3500 has averaged 11.6 mpg over two years, with highway mileage exceeding 20 mpg when not towing. Tire wear has been a significant expense, with the first set lasting less than 8,000 miles, a reflection of the demanding towing conditions.
Interior Comfort and Durability
The interior of the Sierra 3500 has remained in excellent condition, with no issues reported in the leather, electronics, or infotainment system. The comfort and durability of the cabin are commendable, especially considering the rigorous use.
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Conclusion
The 2017 GMC Sierra 3500 SLT 4×4 has proven to be a reliable and capable truck under extreme towing conditions. Its performance, coupled with a comfortable and durable interior, makes it a strong contender for those in need of a heavy-duty towing vehicle. Would we purchase this truck again? Without a doubt, yes.
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