The 2015 GMC Sierra Denali 3500 is one of GM’s ultimate towing pickups. It has a 6.6L Duramax V8 with fresh exterior and interior designs that take cues from the new generation of light duty GM trucks. This makes it one of the quietest and most comfortable HD pickups TLFtruck has ever tested. The unchanged 6.6L turbo-diesel produces 397 hp @ 3,000 rpm and a maximum 765 lb-ft of torque @ 1,600 rpm. The maximum rpm of the engine is 3,450 under power, and an incredible 4,800 rpm under braking
We’ve already put it through the Ike Gauntlet Extreme Towing Test but this time we’ll see how the 2015 GMC Sierra Denali 3500 does accelerating onto the highway while towing the 5,740 pound TFLtruck test boat.
Nicole Wakelin fell in love with cars as a teenager when she got to go for a ride in a Ferrari. It was red and it was fast and that was all that mattered. Game over. She considers things a bit more carefully now, but still has a weakness for fast, beautiful cars. Nicole also writes for NerdApproved and GeekMom.