Available Duramax Diesel 6600 V8(1)
Vortec 4800 or 6000 V8 engine (depending on model)
Hydra-Matic four-speed heavy-duty automatic transmission with overdrive and Tow/Haul mode
A wide range of body upfits(2)
139-inch, 159-inch, and 177-inch wheelbase length options
