Engines and modifications Sierra 3500HD III (GMT900, facelift 2011) Crew Cab Long Box

6.6 Duramax TD V8 (397 Hp) SRW Automatic

6.6 Duramax TD V8 (397 Hp) DRW Automatic

6.6 Duramax TD V8 (397 Hp) 4WD SRW Automatic

6.6 Duramax TD V8 (397 Hp) 4WD DRW Automatic

6.0 V8 (360 Hp) SRW Automatic

6.0 V8 (360 Hp) DRW Automatic

6.0 V8 (360 Hp) 4WD SRW Automatic

6.0 V8 (360 Hp) 4WD DRW Automatic