Engine, Vortec 5.3L V8 SFI FlexFuel with Active Fuel Management, capable of running on unleaded or up to 85% ethanol (with gas - 320 hp [238.6 kW] at 5400 rpm, 335 lb-ft of torque [452.2 N-m] at 4000 rpm, with E85 ethanol - 326 hp [243.1 kW] at 5300 rpm, 348 lb-ft of torque [469.8 N-m] at 4400 rpm), iron block
Rear axle, 3.08 ratio (Not available with (K5L) Heavy-Duty Trailering Package.)
Suspension Package, Premium Smooth Ride
GVWR, 7300 lbs. (3311 kg) (Standard on 4WD models.)