Specifications Comparison: 2023 GMC Sierra 2500 vs 2003 GMC Sierra 2500

Legroom

Trim	Eng.	Drive train	1st Row Legroom (in)	2nd Row Legroom (in)
HD Pro Crew Cab 159"	6.6L V8	RWD	44	43
HD Pro Crew Cab 172"	6.6L V8	RWD	44	43
HD Pro Double Cab 149"	6.6L V8	RWD	44	35
HD Pro Double Cab 162"	6.6L V8	RWD	44	35
HD Pro Reg Cab 142"	6.6L V8	RWD	44
HD Pro Crew Cab 159"	6.6L V8	4WD	44	43
HD Pro Crew Cab 172"	6.6L V8	4WD	44	43
HD Pro Double Cab 149"	6.6L V8	4WD	44	35
HD Pro Double Cab 162"	6.6L V8	4WD	44	35
HD Pro Reg Cab 142"	6.6L V8	4WD	44
HD SLE Crew Cab 159"	6.6L V8	RWD	44	43
HD SLE Crew Cab 172"	6.6L V8	RWD	44	43
HD SLE Double Cab 149"	6.6L V8	RWD	44	35
HD SLE Double Cab 162"	6.6L V8	RWD	44	35
HD SLE Reg Cab 142"	6.6L V8	RWD	44
HD SLE Crew Cab 159"	6.6L V8	4WD	44	43
HD SLE Crew Cab 172"	6.6L V8	4WD	44	43
HD SLE Double Cab 149"	6.6L V8	4WD	44	35
HD SLE Double Cab 162"	6.6L V8	4WD	44	35
HD SLE Reg Cab 142"	6.6L V8	4WD	44
HD SLT Crew Cab 159"	6.6L V8	RWD	44	43
HD SLT Crew Cab 172"	6.6L V8	RWD	44	43
HD SLT Double Cab 149"	6.6L V8	RWD	44	35
HD SLT Double Cab 162"	6.6L V8	RWD	44	35
HD SLT Crew Cab 159"	6.6L V8	4WD	44	43
HD SLT Crew Cab 172"	6.6L V8	4WD	44	43
HD SLT Double Cab 149"	6.6L V8	4WD	44	35
HD SLT Double Cab 162"	6.6L V8	4WD	44	35
HD AT4 Crew Cab 159"	6.6L V8	4WD	44	43
HD AT4 Crew Cab 172"	6.6L V8	4WD	44	43
HD Denali Crew Cab 159"	6.6L V8	4WD	44	43
HD Denali Crew Cab 172"	6.6L V8	4WD	44	43

Trim	Eng.	Drive train	1st Row Legroom (in)	2nd Row Legroom (in)
2500 Extended Cab	V8	4WD	41.3	33.7
2500 Extended Cab SLE	V8	4WD	41.3	33.7
2500 Extended Cab SLT	V8	4WD	41.3	33.7
2500 Regular Cab	V8	RWD	41.3
2500 Regular Cab SLE	V8	RWD	41.3
HD 2500 Crew Cab	V8	RWD	41.3	38.8
HD 2500 Crew Cab	V8	4WD	41.3	38.8
HD 2500 Crew Cab SLE	V8	RWD	41.3	38.8
HD 2500 Crew Cab SLE	V8	4WD	41.3	38.8
HD 2500 Crew Cab SLT	V8	RWD	41.3	38.8
HD 2500 Crew Cab SLT	V8	4WD	41.3	38.8
HD 2500 Extended Cab	V8	RWD	41.3	33.7
HD 2500 Extended Cab	V8	4WD	41.3	33.7
HD 2500 Extended Cab SLE	V8	RWD	41.3	33.7
HD 2500 Extended Cab SLE	V8	4WD	41.3	33.7
HD 2500 Extended Cab SLT	V8	RWD	41.3	33.7
HD 2500 Extended Cab SLT	V8	4WD	41.3	33.7
HD 2500 Regular Cab	V8	RWD	41.3
HD 2500 Regular Cab	V8	4WD	41.3
HD 2500 Regular Cab SLE	V8	RWD	41.3
HD 2500 Regular Cab SLE	V8	4WD	41.3

Trim	Eng.	Drive train	1st Row Legroom (cm)	2nd Row Legroom (cm)
HD Pro Crew Cab 159"	6.6L V8	RWD	111	109
HD Pro Crew Cab 172"	6.6L V8	RWD	111	109
HD Pro Double Cab 149"	6.6L V8	RWD	111	88
HD Pro Double Cab 162"	6.6L V8	RWD	111	88
HD Pro Reg Cab 142"	6.6L V8	RWD	111
HD Pro Crew Cab 159"	6.6L V8	4WD	111	109
HD Pro Crew Cab 172"	6.6L V8	4WD	111	109
HD Pro Double Cab 149"	6.6L V8	4WD	111	88
HD Pro Double Cab 162"	6.6L V8	4WD	111	88
HD Pro Reg Cab 142"	6.6L V8	4WD	111
HD SLE Crew Cab 159"	6.6L V8	RWD	111	109
HD SLE Crew Cab 172"	6.6L V8	RWD	111	109
HD SLE Double Cab 149"	6.6L V8	RWD	111	88
HD SLE Double Cab 162"	6.6L V8	RWD	111	88
HD SLE Reg Cab 142"	6.6L V8	RWD	111
HD SLE Crew Cab 159"	6.6L V8	4WD	111	109
HD SLE Crew Cab 172"	6.6L V8	4WD	111	109
HD SLE Double Cab 149"	6.6L V8	4WD	111	88
HD SLE Double Cab 162"	6.6L V8	4WD	111	88
HD SLE Reg Cab 142"	6.6L V8	4WD	111
HD SLT Crew Cab 159"	6.6L V8	RWD	111	109
HD SLT Crew Cab 172"	6.6L V8	RWD	111	109
HD SLT Double Cab 149"	6.6L V8	RWD	111	88
HD SLT Double Cab 162"	6.6L V8	RWD	111	88
HD SLT Crew Cab 159"	6.6L V8	4WD	111	109
HD SLT Crew Cab 172"	6.6L V8	4WD	111	109
HD SLT Double Cab 149"	6.6L V8	4WD	111	88
HD SLT Double Cab 162"	6.6L V8	4WD	111	88
HD AT4 Crew Cab 159"	6.6L V8	4WD	111	109
HD AT4 Crew Cab 172"	6.6L V8	4WD	111	109
HD Denali Crew Cab 159"	6.6L V8	4WD	111	109
HD Denali Crew Cab 172"	6.6L V8	4WD	111	109

Trim	Eng.	Drive train	1st Row Legroom (cm)	2nd Row Legroom (cm)
2500 Extended Cab	V8	4WD	104.9	85.6
2500 Extended Cab SLE	V8	4WD	104.9	85.6
2500 Extended Cab SLT	V8	4WD	104.9	85.6
2500 Regular Cab	V8	RWD	104.9
2500 Regular Cab SLE	V8	RWD	104.9
HD 2500 Crew Cab	V8	RWD	104.9	98.6
HD 2500 Crew Cab	V8	4WD	104.9	98.6
HD 2500 Crew Cab SLE	V8	RWD	104.9	98.6
HD 2500 Crew Cab SLE	V8	4WD	104.9	98.6
HD 2500 Crew Cab SLT	V8	RWD	104.9	98.6
HD 2500 Crew Cab SLT	V8	4WD	104.9	98.6
HD 2500 Extended Cab	V8	RWD	104.9	85.6
HD 2500 Extended Cab	V8	4WD	104.9	85.6
HD 2500 Extended Cab SLE	V8	RWD	104.9	85.6
HD 2500 Extended Cab SLE	V8	4WD	104.9	85.6
HD 2500 Extended Cab SLT	V8	RWD	104.9	85.6
HD 2500 Extended Cab SLT	V8	4WD	104.9	85.6
HD 2500 Regular Cab	V8	RWD	104.9
HD 2500 Regular Cab	V8	4WD	104.9
HD 2500 Regular Cab SLE	V8	RWD	104.9
HD 2500 Regular Cab SLE	V8	4WD	104.9