Specifications Comparison: 2018 GMC Sierra 3500 vs 2021 GMC Sierra 3500

Engine Horsepower & Torque

Trim	Eng.	Drive train	HP	Torque (ft-lbs)
HD 3500 Crew Cab	6.0L V8	RWD	360	380
HD 3500 Crew Cab	6.0L V8	4WD	360	380
HD 3500 Crew Cab Denali	6.0L V8	RWD	360	380
HD 3500 Crew Cab Denali	6.0L V8	4WD	360	380
HD 3500 Crew Cab SLE	6.0L V8	RWD	360	380
HD 3500 Crew Cab SLE	6.0L V8	4WD	360	380
HD 3500 Crew Cab SLT	6.0L V8	RWD	360	380
HD 3500 Crew Cab SLT	6.0L V8	4WD	360	380
HD 3500 Extended Cab	6.0L V8	RWD	360	380
HD 3500 Extended Cab	6.0L V8	4WD	360	380
HD 3500 Extended Cab SLE	6.0L V8	RWD	360	380
HD 3500 Extended Cab SLE	6.0L V8	4WD	360	380
HD 3500 Extended Cab SLT	6.0L V8	RWD	360	380
HD 3500 Regular Cab	6.0L V8	RWD	360	380
HD 3500 Regular Cab	6.0L V8	4WD	360	380
HD 3500 Regular Cab SLE	6.0L V8	RWD	360	380
HD 3500 Regular Cab SLE	6.0L V8	4WD	360	380

Trim	Eng.	Drive train	HP	Torque (ft-lbs)
HD Crew Cab	6.6L V8	RWD	401	464
HD Crew Cab	6.6L V8	RWD	445	910
HD Crew Cab	6.6L V8	4WD	401	464
HD Crew Cab	6.6L V8	4WD	445	910
HD Crew Cab AT4	6.6L V8	4WD	401	464
HD Crew Cab AT4	6.6L V8	4WD	445	910
HD Crew Cab Denali	6.6L V8	4WD	401	464
HD Crew Cab Denali	6.6L V8	4WD	445	910
HD Crew Cab SLE	6.6L V8	RWD	401	464
HD Crew Cab SLE	6.6L V8	RWD	445	910
HD Crew Cab SLE	6.6L V8	4WD	401	464
HD Crew Cab SLE	6.6L V8	4WD	445	910
HD Crew Cab SLT	6.6L V8	RWD	401	464
HD Crew Cab SLT	6.6L V8	RWD	445	910
HD Crew Cab SLT	6.6L V8	4WD	401	464
HD Crew Cab SLT	6.6L V8	4WD	445	910
HD Extended Cab	6.6L V8	RWD	401	464
HD Extended Cab	6.6L V8	RWD	445	910
HD Extended Cab	6.6L V8	4WD	401	464
HD Extended Cab	6.6L V8	4WD	445	910
HD Extended Cab SLE	6.6L V8	RWD	401	464
HD Extended Cab SLE	6.6L V8	RWD	445	910
HD Extended Cab SLE	6.6L V8	4WD	401	464
HD Extended Cab SLE	6.6L V8	4WD	445	910
HD Regular Cab	6.6L V8	RWD	401	464
HD Regular Cab	6.6L V8	RWD	445	910
HD Regular Cab	6.6L V8	4WD	401	464
HD Regular Cab	6.6L V8	4WD	445	910
HD Regular Cab SLE	6.6L V8	RWD	401	464
HD Regular Cab SLE	6.6L V8	RWD	445	910
HD Regular Cab SLE	6.6L V8	4WD	401	464
HD Regular Cab SLE	6.6L V8	4WD	445	910

Trim	Eng.	Drive train	HP Per Liter	HP Per Inch³
HD 3500 Crew Cab	6.0L V8	RWD	60	0.98
HD 3500 Crew Cab	6.0L V8	4WD	60	0.98
HD 3500 Crew Cab Denali	6.0L V8	RWD	60	0.98
HD 3500 Crew Cab Denali	6.0L V8	4WD	60	0.98
HD 3500 Crew Cab SLE	6.0L V8	RWD	60	0.98
HD 3500 Crew Cab SLE	6.0L V8	4WD	60	0.98
HD 3500 Crew Cab SLT	6.0L V8	RWD	60	0.98
HD 3500 Crew Cab SLT	6.0L V8	4WD	60	0.98
HD 3500 Extended Cab	6.0L V8	RWD	60	0.98
HD 3500 Extended Cab	6.0L V8	4WD	60	0.98
HD 3500 Extended Cab SLE	6.0L V8	RWD	60	0.98
HD 3500 Extended Cab SLE	6.0L V8	4WD	60	0.98
HD 3500 Extended Cab SLT	6.0L V8	RWD	60	0.98
HD 3500 Regular Cab	6.0L V8	RWD	60	0.98
HD 3500 Regular Cab	6.0L V8	4WD	60	0.98
HD 3500 Regular Cab SLE	6.0L V8	RWD	60	0.98
HD 3500 Regular Cab SLE	6.0L V8	4WD	60	0.98

Trim	Eng.	Drive train	HP Per Liter	HP Per Inch³
HD Crew Cab	6.6L V8	RWD	60	1.0
HD Crew Cab	6.6L V8	RWD	67	1.11
HD Crew Cab	6.6L V8	4WD	60	1.0
HD Crew Cab	6.6L V8	4WD	67	1.11
HD Crew Cab AT4	6.6L V8	4WD	60	1.0
HD Crew Cab AT4	6.6L V8	4WD	67	1.11
HD Crew Cab Denali	6.6L V8	4WD	60	1.0
HD Crew Cab Denali	6.6L V8	4WD	67	1.11
HD Crew Cab SLE	6.6L V8	RWD	60	1.0
HD Crew Cab SLE	6.6L V8	RWD	67	1.11
HD Crew Cab SLE	6.6L V8	4WD	60	1.0
HD Crew Cab SLE	6.6L V8	4WD	67	1.11
HD Crew Cab SLT	6.6L V8	RWD	60	1.0
HD Crew Cab SLT	6.6L V8	RWD	67	1.11
HD Crew Cab SLT	6.6L V8	4WD	60	1.0
HD Crew Cab SLT	6.6L V8	4WD	67	1.11
HD Extended Cab	6.6L V8	RWD	60	1.0
HD Extended Cab	6.6L V8	RWD	67	1.11
HD Extended Cab	6.6L V8	4WD	60	1.0
HD Extended Cab	6.6L V8	4WD	67	1.11
HD Extended Cab SLE	6.6L V8	RWD	60	1.0
HD Extended Cab SLE	6.6L V8	RWD	67	1.11
HD Extended Cab SLE	6.6L V8	4WD	60	1.0
HD Extended Cab SLE	6.6L V8	4WD	67	1.11
HD Regular Cab	6.6L V8	RWD	60	1.0
HD Regular Cab	6.6L V8	RWD	67	1.11
HD Regular Cab	6.6L V8	4WD	60	1.0
HD Regular Cab	6.6L V8	4WD	67	1.11
HD Regular Cab SLE	6.6L V8	RWD	60	1.0
HD Regular Cab SLE	6.6L V8	RWD	67	1.11
HD Regular Cab SLE	6.6L V8	4WD	60	1.0
HD Regular Cab SLE	6.6L V8	4WD	67	1.11