Engines and modifications Silverado 2500 HD II (GMT900, facelift 2011) Extended Cab Standard Box

6.6 Duramax TD V8 (397 Hp) Automatic

6.6 Duramax TD V8 (397 Hp) 4WD Automatic

6.0 V8 (360 Hp) Automatic

6.0 V8 (360 Hp) 4WD Automatic