Engines and modifications Sierra 3500HD IV (GMTK2XX) Crew Cab Long Box

6.6 TD V8 (445 Hp) 4WD DRW Automatic

6.6 Duramax TD V8 (445 Hp) SRW Automatic

6.6 Duramax TD V8 (445 Hp) DRW Automatic

6.6 Duramax TD V8 (445 Hp) 4WD SRW Automatic

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) DRW Automatic

6.0 V8 (360 Hp) 4WD SRW Automatic

6.0 V8 (360 Hp) 4WD DRW Automatic

6.0 V8 (301 Hp) Automatic CNG

6.0 V8 (301 Hp) 4WD Automatic CNG