Specifications Comparison: 2021 GMC Sierra 2500 vs 2024 Dodge Ram 2500

Headroom

Trim	Eng.	Drive train	1st Row Headroom (in)	2nd Row Headroom (in)
HD Crew Cab	6.6L V8	RWD	43	40
HD Crew Cab	6.6L V8	RWD	43	40
HD Crew Cab	6.6L V8	4WD	43	40
HD Crew Cab	6.6L V8	4WD	43	40
HD Crew Cab AT4	6.6L V8	4WD	43	40
HD Crew Cab AT4	6.6L V8	4WD	43	40
HD Crew Cab Denali	6.6L V8	4WD	43	40
HD Crew Cab Denali	6.6L V8	4WD	43	40
HD Crew Cab SLE	6.6L V8	RWD	43	40
HD Crew Cab SLE	6.6L V8	RWD	43	40
HD Crew Cab SLE	6.6L V8	4WD	43	40
HD Crew Cab SLE	6.6L V8	4WD	43	40
HD Crew Cab SLT	6.6L V8	RWD	43	40
HD Crew Cab SLT	6.6L V8	RWD	43	40
HD Crew Cab SLT	6.6L V8	4WD	43	40
HD Crew Cab SLT	6.6L V8	4WD	43	40
HD Extended Cab	6.6L V8	RWD	43	39
HD Extended Cab	6.6L V8	RWD	43	39
HD Extended Cab	6.6L V8	4WD	43	39
HD Extended Cab	6.6L V8	4WD	43	39
HD Extended Cab SLE	6.6L V8	RWD	43	39
HD Extended Cab SLE	6.6L V8	RWD	43	39
HD Extended Cab SLE	6.6L V8	4WD	43	39
HD Extended Cab SLE	6.6L V8	4WD	43	39
HD Extended Cab SLT	6.6L V8	RWD	43	39
HD Extended Cab SLT	6.6L V8	RWD	43	39
HD Extended Cab SLT	6.6L V8	4WD	43	39
HD Extended Cab SLT	6.6L V8	4WD	43	39
HD Regular Cab	6.6L V8	RWD	43
HD Regular Cab	6.6L V8	RWD	43
HD Regular Cab	6.6L V8	4WD	43
HD Regular Cab	6.6L V8	4WD	43
HD Regular Cab SLE	6.6L V8	RWD	43
HD Regular Cab SLE	6.6L V8	RWD	43
HD Regular Cab SLE	6.6L V8	4WD	43
HD Regular Cab SLE	6.6L V8	4WD	43

Trim	Eng.	Drive train	1st Row Headroom (in)	2nd Row Headroom (in)
Big Horn Crew Cab 6'4" Box	6.4L V8		40.9	39.8
Big Horn Crew Cab 8' Box	6.4L V8		40.9	39.8
Big Horn Reg Cab 8' Box	6.4L V8		39.8
Big Horn Crew Cab 6'4" Box	6.4L V8	4WD	40.9	39.8
Big Horn Crew Cab 8' Box	6.7L I6	4WD	40.9	39.8
Big Horn Reg Cab 8' Box	6.4L V8		39.8
Laramie Crew Cab 6'4" Box	6.4L V8		40.9	39.8
Laramie Crew Cab 8' Box	6.4L V8	RWD	40.9	39.8
Laramie Crew Cab 6'4" Box	6.4L V8	4WD	40.9	39.8
Laramie Crew Cab 8' Box	6.7L I6	4WD	40.9	39.8
Laramie Mega Cab 6'4" Box	6.7L I6	4WD	40.9	40.3
Limited Crew Cab 6'4" Box	6.7L I6	4WD	40.9	39.8
Limited Crew Cab 8' Box	6.7L I6		40.9	39.8
Limited Mega Cab 6'4" Box	6.7L I6	4WD	40.9	40.3
Lone Star Crew Cab 6'4" Box	6.4L V8	RWD	40.9	39.8
Lone Star Crew Cab 8' Box	6.4L V8		40.9	39.8
Lone Star Reg Cab 8' Box	6.4L V8	RWD	39.8
Lone Star Crew Cab 6'4" Box	6.4L V8	4WD	40.9	39.8
Lone Star Crew Cab 8' Box	6.7L I6	4WD	40.9	39.8
Lone Star Reg Cab 8' Box	6.7L I6	4WD	39.8
Longhorn Crew Cab 6'4" Box	6.7L I6	4WD	40.9	39.8
Longhorn Crew Cab 8' Box	6.7L I6		40.9	39.8
Longhorn Mega Cab 6'4" Box	6.7L I6	4WD	40.9	40.3
Power Crew Cab 6'4" Box	6.4L V8	4WD	40.9	39.8
Power Rebel Crew Cab 6'4" Box	6.4L V8	4WD	40.9	39.8
Tradesman Crew Cab 6'4" Box	6.4L V8		40.9	39.8
Tradesman Crew Cab 8' Box	6.4L V8	RWD	40.9	39.8
Tradesman Reg Cab 8' Box	6.4L V8	RWD	39.8
Tradesman Crew Cab 6'4" Box	6.4L V8	4WD	40.9	39.8
Tradesman Crew Cab 8' Box	6.4L V8	4WD	40.9	39.8
Tradesman Reg Cab 8' Box	6.4L V8	4WD	39.8

Trim	Eng.	Drive train	1st Row Headroom (cm)	2nd Row Headroom (cm)
HD Crew Cab	6.6L V8	RWD	109	101
HD Crew Cab	6.6L V8	RWD	109	101
HD Crew Cab	6.6L V8	4WD	109	101
HD Crew Cab	6.6L V8	4WD	109	101
HD Crew Cab AT4	6.6L V8	4WD	109	101
HD Crew Cab AT4	6.6L V8	4WD	109	101
HD Crew Cab Denali	6.6L V8	4WD	109	101
HD Crew Cab Denali	6.6L V8	4WD	109	101
HD Crew Cab SLE	6.6L V8	RWD	109	101
HD Crew Cab SLE	6.6L V8	RWD	109	101
HD Crew Cab SLE	6.6L V8	4WD	109	101
HD Crew Cab SLE	6.6L V8	4WD	109	101
HD Crew Cab SLT	6.6L V8	RWD	109	101
HD Crew Cab SLT	6.6L V8	RWD	109	101
HD Crew Cab SLT	6.6L V8	4WD	109	101
HD Crew Cab SLT	6.6L V8	4WD	109	101
HD Extended Cab	6.6L V8	RWD	109	99
HD Extended Cab	6.6L V8	RWD	109	99
HD Extended Cab	6.6L V8	4WD	109	99
HD Extended Cab	6.6L V8	4WD	109	99
HD Extended Cab SLE	6.6L V8	RWD	109	99
HD Extended Cab SLE	6.6L V8	RWD	109	99
HD Extended Cab SLE	6.6L V8	4WD	109	99
HD Extended Cab SLE	6.6L V8	4WD	109	99
HD Extended Cab SLT	6.6L V8	RWD	109	99
HD Extended Cab SLT	6.6L V8	RWD	109	99
HD Extended Cab SLT	6.6L V8	4WD	109	99
HD Extended Cab SLT	6.6L V8	4WD	109	99
HD Regular Cab	6.6L V8	RWD	109
HD Regular Cab	6.6L V8	RWD	109
HD Regular Cab	6.6L V8	4WD	109
HD Regular Cab	6.6L V8	4WD	109
HD Regular Cab SLE	6.6L V8	RWD	109
HD Regular Cab SLE	6.6L V8	RWD	109
HD Regular Cab SLE	6.6L V8	4WD	109
HD Regular Cab SLE	6.6L V8	4WD	109

Trim	Eng.	Drive train	1st Row Headroom (cm)	2nd Row Headroom (cm)
Big Horn Crew Cab 6'4" Box	6.4L V8		104	101
Big Horn Crew Cab 8' Box	6.4L V8		104	101
Big Horn Reg Cab 8' Box	6.4L V8		101
Big Horn Crew Cab 6'4" Box	6.4L V8	4WD	104	101
Big Horn Crew Cab 8' Box	6.7L I6	4WD	104	101
Big Horn Reg Cab 8' Box	6.4L V8		101
Laramie Crew Cab 6'4" Box	6.4L V8		104	101
Laramie Crew Cab 8' Box	6.4L V8	RWD	104	101
Laramie Crew Cab 6'4" Box	6.4L V8	4WD	104	101
Laramie Crew Cab 8' Box	6.7L I6	4WD	104	101
Laramie Mega Cab 6'4" Box	6.7L I6	4WD	104	102
Limited Crew Cab 6'4" Box	6.7L I6	4WD	104	101
Limited Crew Cab 8' Box	6.7L I6		104	101
Limited Mega Cab 6'4" Box	6.7L I6	4WD	104	102
Lone Star Crew Cab 6'4" Box	6.4L V8	RWD	104	101
Lone Star Crew Cab 8' Box	6.4L V8		104	101
Lone Star Reg Cab 8' Box	6.4L V8	RWD	101
Lone Star Crew Cab 6'4" Box	6.4L V8	4WD	104	101
Lone Star Crew Cab 8' Box	6.7L I6	4WD	104	101
Lone Star Reg Cab 8' Box	6.7L I6	4WD	101
Longhorn Crew Cab 6'4" Box	6.7L I6	4WD	104	101
Longhorn Crew Cab 8' Box	6.7L I6		104	101
Longhorn Mega Cab 6'4" Box	6.7L I6	4WD	104	102
Power Crew Cab 6'4" Box	6.4L V8	4WD	104	101
Power Rebel Crew Cab 6'4" Box	6.4L V8	4WD	104	101
Tradesman Crew Cab 6'4" Box	6.4L V8		104	101
Tradesman Crew Cab 8' Box	6.4L V8	RWD	104	101
Tradesman Reg Cab 8' Box	6.4L V8	RWD	101
Tradesman Crew Cab 6'4" Box	6.4L V8	4WD	104	101
Tradesman Crew Cab 8' Box	6.4L V8	4WD	104	101
Tradesman Reg Cab 8' Box	6.4L V8	4WD	101