Engines and modifications Silverado 2500 HD IV (T1XX) Crew Cab Standard Bed

6.6 V8 (401 Hp) Automatic

6.6 V8 (401 Hp) 4WD Automatic

6.6 Duramax V8 (445 Hp) Automatic

6.6 Duramax V8 (445 Hp) 4WD Automatic