Specifications Comparison: 2024 GMC Sierra 2500 vs 2006 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	44.53	43.4
HD Pro Crew Cab 172"	6.6L V8	RWD	44.53	43.4
HD Pro Double Cab 149"	6.6L V8	RWD	44.53	35.24
HD Pro Double Cab 162"	6.6L V8	RWD	44.53	35.24
HD Pro Reg Cab 142"	6.6L V8	RWD	44.53
HD Pro Crew Cab 159"	6.6L V8	4WD	44.53	43.4
HD Pro Crew Cab 172"	6.6L V8	4WD	44.53	43.4
HD Pro Double Cab 149"	6.6L V8	4WD	44.53	35.24
HD Pro Double Cab 162"	6.6L V8	4WD	44.53	35.24
HD Pro Reg Cab 142"	6.6L V8	4WD	44.53
HD SLE Crew Cab 159"	6.6L V8	RWD	44.53	43.4
HD SLE Crew Cab 172"	6.6L V8	RWD	44.53	43.4
HD SLE Double Cab 149"	6.6L V8	RWD	44.53	35.24
HD SLE Double Cab 162"	6.6L V8	RWD	44.53	35.24
HD SLE Reg Cab 142"	6.6L V8	RWD	44.53
HD SLE Crew Cab 159"	6.6L V8	4WD	44.53	43.4
HD SLE Crew Cab 172"	6.6L V8	4WD	44.53	43.4
HD SLE Double Cab 149"	6.6L V8	4WD	44.53	35.24
HD SLE Double Cab 162"	6.6L V8	4WD	44.53	35.24
HD SLE Reg Cab 142"	6.6L V8	4WD	44.53
HD SLT Crew Cab 159"	6.6L V8	RWD	44.53	43.4
HD SLT Crew Cab 172"	6.6L V8	RWD	44.53	43.4
HD SLT Crew Cab 159"	6.6L V8	4WD	44.53	43.4
HD SLT Crew Cab 172"	6.6L V8	4WD	44.53	43.4
HD AT4 Crew Cab 159"	6.6L V8	4WD	44.53	43.4
HD AT4 Crew Cab 172"	6.6L V8	4WD	44.53	43.4
HD AT4X Crew Cab 159"	6.6L V8	4WD	44.53	43.4
HD Denali Crew Cab 159"	6.6L V8	4WD	44.53	43.4
HD Denali Crew Cab 172"	6.6L V8	4WD	44.53	43.4
HD Denali Ultimate Crew Cab 159"	6.6L V8	4WD	44.53	43.4
HD Denali Ultimate Crew Cab 172"	6.6L V8	4WD	44.53	43.4

Trim	Eng.	Drive train	1st Row Legroom (in)	2nd Row Legroom (in)
HD 2500 Crew Cab SL	V8	RWD	41.3	39.1
HD 2500 Crew Cab SL	V8	4WD	41.3	39.1
HD 2500 Crew Cab SLE	V8	RWD	41.3	39.1
HD 2500 Crew Cab SLE	V8	4WD	41.3	39.1
HD 2500 Crew Cab SLT	V8	RWD	41.3	39.1
HD 2500 Crew Cab SLT	V8	4WD	41.3	39.1
HD 2500 Extended Cab SL	V8	RWD	41.3	33.7
HD 2500 Extended Cab SL	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 SL	V8	RWD	41.3
HD 2500 Regular Cab SL	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	113	110
HD Pro Crew Cab 172"	6.6L V8	RWD	113	110
HD Pro Double Cab 149"	6.6L V8	RWD	113	90
HD Pro Double Cab 162"	6.6L V8	RWD	113	90
HD Pro Reg Cab 142"	6.6L V8	RWD	113
HD Pro Crew Cab 159"	6.6L V8	4WD	113	110
HD Pro Crew Cab 172"	6.6L V8	4WD	113	110
HD Pro Double Cab 149"	6.6L V8	4WD	113	90
HD Pro Double Cab 162"	6.6L V8	4WD	113	90
HD Pro Reg Cab 142"	6.6L V8	4WD	113
HD SLE Crew Cab 159"	6.6L V8	RWD	113	110
HD SLE Crew Cab 172"	6.6L V8	RWD	113	110
HD SLE Double Cab 149"	6.6L V8	RWD	113	90
HD SLE Double Cab 162"	6.6L V8	RWD	113	90
HD SLE Reg Cab 142"	6.6L V8	RWD	113
HD SLE Crew Cab 159"	6.6L V8	4WD	113	110
HD SLE Crew Cab 172"	6.6L V8	4WD	113	110
HD SLE Double Cab 149"	6.6L V8	4WD	113	90
HD SLE Double Cab 162"	6.6L V8	4WD	113	90
HD SLE Reg Cab 142"	6.6L V8	4WD	113
HD SLT Crew Cab 159"	6.6L V8	RWD	113	110
HD SLT Crew Cab 172"	6.6L V8	RWD	113	110
HD SLT Crew Cab 159"	6.6L V8	4WD	113	110
HD SLT Crew Cab 172"	6.6L V8	4WD	113	110
HD AT4 Crew Cab 159"	6.6L V8	4WD	113	110
HD AT4 Crew Cab 172"	6.6L V8	4WD	113	110
HD AT4X Crew Cab 159"	6.6L V8	4WD	113	110
HD Denali Crew Cab 159"	6.6L V8	4WD	113	110
HD Denali Crew Cab 172"	6.6L V8	4WD	113	110
HD Denali Ultimate Crew Cab 159"	6.6L V8	4WD	113	110
HD Denali Ultimate Crew Cab 172"	6.6L V8	4WD	113	110

Trim	Eng.	Drive train	1st Row Legroom (cm)	2nd Row Legroom (cm)
HD 2500 Crew Cab SL	V8	RWD	104.9	99.3
HD 2500 Crew Cab SL	V8	4WD	104.9	99.3
HD 2500 Crew Cab SLE	V8	RWD	104.9	99.3
HD 2500 Crew Cab SLE	V8	4WD	104.9	99.3
HD 2500 Crew Cab SLT	V8	RWD	104.9	99.3
HD 2500 Crew Cab SLT	V8	4WD	104.9	99.3
HD 2500 Extended Cab SL	V8	RWD	104.9	85.6
HD 2500 Extended Cab SL	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 SL	V8	RWD	104.9
HD 2500 Regular Cab SL	V8	4WD	104.9
HD 2500 Regular Cab SLE	V8	RWD	104.9
HD 2500 Regular Cab SLE	V8	4WD	104.9