Specifications Comparison: 2012 GMC Sierra 3500 vs 2007 GMC Sierra 3500

Legroom

Trim	Eng.	Drive train	1st Row Legroom (in)	2nd Row Legroom (in)
HD 3500 Crew Cab Denali	6.0L V8	RWD	41.3	39
HD 3500 Crew Cab Denali	6.0L V8	4WD	41.3	39
HD 3500 Crew Cab SLE	6.0L V8	RWD	41.3	39
HD 3500 Crew Cab SLE	6.0L V8	4WD	41.3	39
HD 3500 Crew Cab SLT	6.0L V8	RWD	41.3	39
HD 3500 Crew Cab SLT	6.0L V8	4WD	41.3	39
HD 3500 Extended Cab SLE	6.0L V8	RWD	41.3	34.3
HD 3500 Extended Cab SLE	6.0L V8	4WD	41.3	34.3
HD 3500 Extended Cab SLT	6.0L V8	RWD	41.3	34.3
HD 3500 Extended Cab SLT	6.0L V8	4WD	41.3	34.3
HD 3500 Regular Cab SLE	6.0L V8	RWD	41.3
HD 3500 Regular Cab SLE	6.0L V8	4WD	41.3

Trim	Eng.	Drive train	1st Row Legroom (in)	2nd Row Legroom (in)
Classic 3500 Crew Cab SL	6.0L V8	RWD	41.3	39.1
Classic 3500 Crew Cab SL	6.0L V8	4WD	41.3	39.1
Classic 3500 Crew Cab SLE	6.0L V8	RWD	41.3	39.1
Classic 3500 Crew Cab SLE	6.0L V8	4WD	41.3	39.1
Classic 3500 Crew Cab SLT	6.0L V8	RWD	41.3	39.1
Classic 3500 Crew Cab SLT	6.0L V8	4WD	41.3	39.1
Classic 3500 Extended Cab SL	6.0L V8	RWD	41.3	33.7
Classic 3500 Extended Cab SL	6.0L V8	4WD	41.3	33.7
Classic 3500 Extended Cab SLE	6.0L V8	RWD	41.3	33.7
Classic 3500 Extended Cab SLE	6.0L V8	4WD	41.3	33.7
Classic 3500 Extended Cab SLT	6.0L V8	RWD	41.3	33.7
Classic 3500 Extended Cab SLT	6.0L V8	4WD	41.3	33.7
Classic 3500 Regular Cab SL	6.0L V8	RWD	41.3
Classic 3500 Regular Cab SL	6.0L V8	4WD	41.3
Classic 3500 Regular Cab SLE	6.0L V8	RWD	41.3
Classic 3500 Regular Cab SLE	6.0L V8	4WD	41.3
HD 3500 Crew Cab SLE	6.0L V8	RWD	41.3	39
HD 3500 Crew Cab SLE	6.0L V8	4WD	41.3	39
HD 3500 Crew Cab SLT	6.0L V8	RWD	41.3	39
HD 3500 Crew Cab SLT	6.0L V8	4WD	41.3	39
HD 3500 Extended Cab SLE	6.0L V8	RWD	41.3	34.3
HD 3500 Extended Cab SLE	6.0L V8	4WD	41.3	34.3
HD 3500 Extended Cab SLT	6.0L V8	RWD	41.3	34.3
HD 3500 Extended Cab SLT	6.0L V8	4WD	41.3	34.3
HD 3500 Regular Cab SLE	6.0L V8	4WD	41.3

Trim	Eng.	Drive train	1st Row Legroom (cm)	2nd Row Legroom (cm)
HD 3500 Crew Cab Denali	6.0L V8	RWD	104.9	99.1
HD 3500 Crew Cab Denali	6.0L V8	4WD	104.9	99.1
HD 3500 Crew Cab SLE	6.0L V8	RWD	104.9	99.1
HD 3500 Crew Cab SLE	6.0L V8	4WD	104.9	99.1
HD 3500 Crew Cab SLT	6.0L V8	RWD	104.9	99.1
HD 3500 Crew Cab SLT	6.0L V8	4WD	104.9	99.1
HD 3500 Extended Cab SLE	6.0L V8	RWD	104.9	87.1
HD 3500 Extended Cab SLE	6.0L V8	4WD	104.9	87.1
HD 3500 Extended Cab SLT	6.0L V8	RWD	104.9	87.1
HD 3500 Extended Cab SLT	6.0L V8	4WD	104.9	87.1
HD 3500 Regular Cab SLE	6.0L V8	RWD	104.9
HD 3500 Regular Cab SLE	6.0L V8	4WD	104.9

Trim	Eng.	Drive train	1st Row Legroom (cm)	2nd Row Legroom (cm)
Classic 3500 Crew Cab SL	6.0L V8	RWD	104.9	99.3
Classic 3500 Crew Cab SL	6.0L V8	4WD	104.9	99.3
Classic 3500 Crew Cab SLE	6.0L V8	RWD	104.9	99.3
Classic 3500 Crew Cab SLE	6.0L V8	4WD	104.9	99.3
Classic 3500 Crew Cab SLT	6.0L V8	RWD	104.9	99.3
Classic 3500 Crew Cab SLT	6.0L V8	4WD	104.9	99.3
Classic 3500 Extended Cab SL	6.0L V8	RWD	104.9	85.6
Classic 3500 Extended Cab SL	6.0L V8	4WD	104.9	85.6
Classic 3500 Extended Cab SLE	6.0L V8	RWD	104.9	85.6
Classic 3500 Extended Cab SLE	6.0L V8	4WD	104.9	85.6
Classic 3500 Extended Cab SLT	6.0L V8	RWD	104.9	85.6
Classic 3500 Extended Cab SLT	6.0L V8	4WD	104.9	85.6
Classic 3500 Regular Cab SL	6.0L V8	RWD	104.9
Classic 3500 Regular Cab SL	6.0L V8	4WD	104.9
Classic 3500 Regular Cab SLE	6.0L V8	RWD	104.9
Classic 3500 Regular Cab SLE	6.0L V8	4WD	104.9
HD 3500 Crew Cab SLE	6.0L V8	RWD	104.9	99.1
HD 3500 Crew Cab SLE	6.0L V8	4WD	104.9	99.1
HD 3500 Crew Cab SLT	6.0L V8	RWD	104.9	99.1
HD 3500 Crew Cab SLT	6.0L V8	4WD	104.9	99.1
HD 3500 Extended Cab SLE	6.0L V8	RWD	104.9	87.1
HD 3500 Extended Cab SLE	6.0L V8	4WD	104.9	87.1
HD 3500 Extended Cab SLT	6.0L V8	RWD	104.9	87.1
HD 3500 Extended Cab SLT	6.0L V8	4WD	104.9	87.1
HD 3500 Regular Cab SLE	6.0L V8	4WD	104.9