Trip Report: 2015 GMC 2500HD Diesel/Allison Exhaust Brake and Hill Descent
In case anyone is interested, thought I'd throw out a little feedback on my latest experience with a new GMC 2500HD Diesel/Allison. Bought the truck last summer and picked up the new 5er (Wildcat 295RSX) this spring. Currently on a 2000 mile round trip from Dallas to Moab Utah, Pagosa Springs Colorado and Cloudcroft New Mexico.
Started with a CAT weight and my GVWR, GCWR, RAWR, FAWR, Payload and Tow Cap are all within Spec and safety margins between 10% to 17%.
This is my first tow into the mountains and canyons. My first pleasant surprise is how well the Diesel Exhaust Brake option works. Fantastic! I leave it on and manage speed with my cruise control. The EB kept me in control without hardly ever having to press the brake pedal.
My second pleasant surprise was how well Descent Control works. I had never used before but decided to give it a try as we descended down into Palo Duro Canyon. A 16% grade with sharp switch backs, recommended speed was 15mph. I flipped the Hill Descent Control lever and the console instructed me to slow speed to below 10mph (which I did). As soon as I fell below 10mph, the Hill Descent icon started flashing on the console and the truck took over management of the accelerator and brakes. All I had to do was steer. 10mph may seem like extremely slow but on narrow cliff roads it was plenty fast enough. My 5er followed the truck and all and all it ended up being a very easy descent. Once I reached to bottom of the canyon, I pressed the accelerator and Hill Descent turned itself off. I made it down with no overheating, no gear grinding, no problems.
2016 Wildcat 295RSX - 2015 GMC 2500HD DblCab Duramax/Allison 4x4 Z71 6.6' Bed
Maxxis 16" E; Ride Rite AirBags w/AirLift 1 wireless compr; Adv.Folding 4 Cover
Andersen Ultimate II Aluminum 5erhitch on Reese Flipball w/Curt 4" offset ball
LCI Ground Control 3.0 4pt + 2pt Elec.Rear stabilizers; 3 Slidecovers; 10ft. Portabote
6000# Dexters; mor/Ryde CRE3000 w/HD Wetbolts; King Dish Tailgater; 5hp Outboard
Dual A/C; Furrion 48 Rear Camera; Champion 3100 Inverter w/Extended Run