Specifications Comparison: 2018 GMC Sierra 1500 vs 2003 GMC Sierra 1500

Legroom

Trim	Eng.	Drive train	1st Row Legroom (in)	2nd Row Legroom (in)
1500 Crew Cab	4.3L V6	RWD	45.3	40.9
1500 Crew Cab	4.3L V6	4WD	45.3	40.9
1500 Crew Cab Denali	5.3L V8	RWD	45.3	40.9
1500 Crew Cab Denali	5.3L V8	4WD	45.3	40.9
1500 Crew Cab SLE	4.3L V6	RWD	45.3	40.9
1500 Crew Cab SLE	4.3L V6	4WD	45.3	40.9
1500 Crew Cab SLT	5.3L V8	RWD	45.3	40.9
1500 Crew Cab SLT	5.3L V8	4WD	45.3	40.9
1500 Crew Cab SLT eAssist	5.3L V8	RWD	45.3	40.9
1500 Crew Cab SLT eAssist	5.3L V8	4WD	45.3	40.9
1500 Extended Cab	4.3L V6	RWD	45.3	34.6
1500 Extended Cab	4.3L V6	4WD	45.3	34.6
1500 Extended Cab SLE	4.3L V6	RWD	45.3	34.6
1500 Extended Cab SLE	4.3L V6	4WD	45.3	34.6
1500 Extended Cab SLT	5.3L V8	RWD	45.3	34.6
1500 Extended Cab SLT	5.3L V8	4WD	45.3	34.6
1500 Regular Cab	4.3L V6	RWD	45.3
1500 Regular Cab	4.3L V6	4WD	45.3
1500 Regular Cab SLE	4.3L V6	RWD	45.3
1500 Regular Cab SLE	4.3L V6	4WD	45.3

Trim	Eng.	Drive train	1st Row Legroom (in)	2nd Row Legroom (in)
1500 Extended Cab	V6	RWD	41.3	33.7
1500 Extended Cab	V8	RWD	41.3	33.7
1500 Extended Cab SLE	V8	RWD	41.3	33.7
1500 Extended Cab SLE	V8	4WD	41.3	33.7
1500 Extended Cab SLT	V8	RWD	41.3	33.7
1500 Extended Cab SLT	V8	4WD	41.3	33.7
1500 Regular Cab	V6	RWD	41.3
1500 Regular Cab	V8	4WD	41.3
1500 Regular Cab SLE	V8	RWD	41.3
1500 Regular Cab SLE	V8	4WD	41.3
HD 1500 Crew Cab SLE	V8	RWD	41.3	38.8
HD 1500 Crew Cab SLE	V8	4WD	41.3	38.8
HD 1500 Crew Cab SLT	V8	RWD	41.3	38.8
HD 1500 Crew Cab SLT	V8	4WD	41.3	38.8
Extended Cab Denali	V8	AWD	41.3	33.7

Trim	Eng.	Drive train	1st Row Legroom (cm)	2nd Row Legroom (cm)
1500 Crew Cab	4.3L V6	RWD	115.1	103.9
1500 Crew Cab	4.3L V6	4WD	115.1	103.9
1500 Crew Cab Denali	5.3L V8	RWD	115.1	103.9
1500 Crew Cab Denali	5.3L V8	4WD	115.1	103.9
1500 Crew Cab SLE	4.3L V6	RWD	115.1	103.9
1500 Crew Cab SLE	4.3L V6	4WD	115.1	103.9
1500 Crew Cab SLT	5.3L V8	RWD	115.1	103.9
1500 Crew Cab SLT	5.3L V8	4WD	115.1	103.9
1500 Crew Cab SLT eAssist	5.3L V8	RWD	115.1	103.9
1500 Crew Cab SLT eAssist	5.3L V8	4WD	115.1	103.9
1500 Extended Cab	4.3L V6	RWD	115.1	87.9
1500 Extended Cab	4.3L V6	4WD	115.1	87.9
1500 Extended Cab SLE	4.3L V6	RWD	115.1	87.9
1500 Extended Cab SLE	4.3L V6	4WD	115.1	87.9
1500 Extended Cab SLT	5.3L V8	RWD	115.1	87.9
1500 Extended Cab SLT	5.3L V8	4WD	115.1	87.9
1500 Regular Cab	4.3L V6	RWD	115.1
1500 Regular Cab	4.3L V6	4WD	115.1
1500 Regular Cab SLE	4.3L V6	RWD	115.1
1500 Regular Cab SLE	4.3L V6	4WD	115.1

Trim	Eng.	Drive train	1st Row Legroom (cm)	2nd Row Legroom (cm)
1500 Extended Cab	V6	RWD	104.9	85.6
1500 Extended Cab	V8	RWD	104.9	85.6
1500 Extended Cab SLE	V8	RWD	104.9	85.6
1500 Extended Cab SLE	V8	4WD	104.9	85.6
1500 Extended Cab SLT	V8	RWD	104.9	85.6
1500 Extended Cab SLT	V8	4WD	104.9	85.6
1500 Regular Cab	V6	RWD	104.9
1500 Regular Cab	V8	4WD	104.9
1500 Regular Cab SLE	V8	RWD	104.9
1500 Regular Cab SLE	V8	4WD	104.9
HD 1500 Crew Cab SLE	V8	RWD	104.9	98.6
HD 1500 Crew Cab SLE	V8	4WD	104.9	98.6
HD 1500 Crew Cab SLT	V8	RWD	104.9	98.6
HD 1500 Crew Cab SLT	V8	4WD	104.9	98.6
Extended Cab Denali	V8	AWD	104.9	85.6