Engines and modifications Sierra 3500HD V (GMTT1XX, facelift 2024) Crew Cab Standard Bed

6.6 V8 (401 Hp) SRW Automatic

6.6 V8 (401 Hp) 4WD SRW Automatic

6.6 Duramax TD V8 (470 Hp) SRW Automatic

6.6 Duramax TD V8 (470 Hp) 4WD SRW Automatic