Specifications Comparison: 2018 GMC Sierra 1500 vs 2012 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 Crew Cab Denali	6.2L V8	RWD	41.3	38.7
1500 Crew Cab Denali	6.2L V8	AWD	41.3	38.7
1500 Crew Cab SL	4.8L V8	RWD	41.3	38.7
1500 Crew Cab SL	4.8L V8	4WD	41.3	38.7
1500 Crew Cab SLE	4.8L V8	RWD	41.3	38.7
1500 Crew Cab SLE	4.8L V8	4WD	41.3	38.7
1500 Crew Cab SLT	5.3L V8	RWD	41.3	38.7
1500 Crew Cab SLT	5.3L V8	4WD	41.3	38.7
1500 Crew Cab Work	4.8L V8	RWD	41.3	38.7
1500 Crew Cab Work	4.8L V8	4WD	41.3	38.7
1500 Crew Cab XFE	5.3L V8	RWD	41.3	38.7
1500 Extended Cab SL	4.8L V8	RWD	41.3	34.3
1500 Extended Cab SL	4.8L V8	4WD	41.3	34.3
1500 Extended Cab SLE	4.8L V8	RWD	41.3	34.3
1500 Extended Cab SLE	4.8L V8	4WD	41.3	34.3
1500 Extended Cab SLT	5.3L V8	RWD	41.3	34.3
1500 Extended Cab SLT	5.3L V8	4WD	41.3	34.3
1500 Extended Cab Work	4.3L V6	RWD	41.3	34.3
1500 Extended Cab Work	4.8L V8	4WD	41.3	34.3
1500 Regular Cab SLE	4.8L V8	RWD	41.3
1500 Regular Cab SLE	4.8L V8	4WD	41.3
1500 Regular Cab Work	4.3L V6	RWD	41.3
1500 Regular Cab Work	4.3L V6	4WD	41.3
1500 Crew Cab	6.0L V8	RWD	41.3	38.7
1500 Crew Cab	6.0L V8	4WD	41.3	38.7

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 Crew Cab Denali	6.2L V8	RWD	104.9	98.3
1500 Crew Cab Denali	6.2L V8	AWD	104.9	98.3
1500 Crew Cab SL	4.8L V8	RWD	104.9	98.3
1500 Crew Cab SL	4.8L V8	4WD	104.9	98.3
1500 Crew Cab SLE	4.8L V8	RWD	104.9	98.3
1500 Crew Cab SLE	4.8L V8	4WD	104.9	98.3
1500 Crew Cab SLT	5.3L V8	RWD	104.9	98.3
1500 Crew Cab SLT	5.3L V8	4WD	104.9	98.3
1500 Crew Cab Work	4.8L V8	RWD	104.9	98.3
1500 Crew Cab Work	4.8L V8	4WD	104.9	98.3
1500 Crew Cab XFE	5.3L V8	RWD	104.9	98.3
1500 Extended Cab SL	4.8L V8	RWD	104.9	87.1
1500 Extended Cab SL	4.8L V8	4WD	104.9	87.1
1500 Extended Cab SLE	4.8L V8	RWD	104.9	87.1
1500 Extended Cab SLE	4.8L V8	4WD	104.9	87.1
1500 Extended Cab SLT	5.3L V8	RWD	104.9	87.1
1500 Extended Cab SLT	5.3L V8	4WD	104.9	87.1
1500 Extended Cab Work	4.3L V6	RWD	104.9	87.1
1500 Extended Cab Work	4.8L V8	4WD	104.9	87.1
1500 Regular Cab SLE	4.8L V8	RWD	104.9
1500 Regular Cab SLE	4.8L V8	4WD	104.9
1500 Regular Cab Work	4.3L V6	RWD	104.9
1500 Regular Cab Work	4.3L V6	4WD	104.9
1500 Crew Cab	6.0L V8	RWD	104.9	98.3
1500 Crew Cab	6.0L V8	4WD	104.9	98.3