As a member of a new class of GM trucks, the 2007 Chevrolet Avalanche gets a slew of upgraded mechanical features. Indeed, this is a thoroughly redesigned vehicle, featuring very little in common with the previous model. For starters, the rear-wheel-drive Avalanche is motivated by a new 5.3-liter V8 engine that makes 320 horsepower at 5,200 rpm and 340 lb.-ft. of torque at 4,200 rpm.