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 [239 kW] at 5400 rpm, 335 lb-ft of torque [454 N-m] at 4000 rpm, with E85 ethanol - 326 hp [243 kW] at 5300 rpm, 348 lb-ft of torque [472 N-m] at 4400 rpm), aluminum block (Requires 4WD models.)
Rear axle, 3.08 ratio (Not available with (K5L) heavy-duty trailering package)
Transfer case, active, 2-speed electronic Autotrac with rotary controls, includes neutral position for dinghy towing. (Requires CK10936 models. Included with (K5L) heavy-duty trailering package.)
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