Specifications Comparison: 2021 GMC Sierra 2500 vs 2010 GMC Sierra 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)
HD 2500 Crew Cab SLE	6.0L V8	RWD	41.3	40.6
HD 2500 Crew Cab SLE	6.0L V8	4WD	41.3	40.6
HD 2500 Crew Cab SLT	6.0L V8	RWD	41.3	40.6
HD 2500 Crew Cab SLT	6.0L V8	4WD	41.3	40.6
HD 2500 Extended Cab SLE	6.0L V8	RWD	41.3	39.3
HD 2500 Extended Cab SLE	6.0L V8	4WD	41.3	39.3
HD 2500 Extended Cab SLT	6.0L V8	RWD	41.3	39.3
HD 2500 Extended Cab SLT	6.0L V8	4WD	41.3	39.3
HD 2500 Regular Cab SLE	6.0L V8	RWD	41.4
HD 2500 Regular Cab SLE	6.0L V8	4WD	41.4

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)
HD 2500 Crew Cab SLE	6.0L V8	RWD	104.9	103.1
HD 2500 Crew Cab SLE	6.0L V8	4WD	104.9	103.1
HD 2500 Crew Cab SLT	6.0L V8	RWD	104.9	103.1
HD 2500 Crew Cab SLT	6.0L V8	4WD	104.9	103.1
HD 2500 Extended Cab SLE	6.0L V8	RWD	104.9	99.8
HD 2500 Extended Cab SLE	6.0L V8	4WD	104.9	99.8
HD 2500 Extended Cab SLT	6.0L V8	RWD	104.9	99.8
HD 2500 Extended Cab SLT	6.0L V8	4WD	104.9	99.8
HD 2500 Regular Cab SLE	6.0L V8	RWD	105.2
HD 2500 Regular Cab SLE	6.0L V8	4WD	105.2