Specifications Comparison: 2018 GMC Sierra 1500 vs 2007 GMC Sierra 1500

Headroom

Trim	Eng.	Drive train	1st Row Headroom (in)	2nd Row Headroom (in)
1500 Crew Cab	4.3L V6	RWD	42.8	40.5
1500 Crew Cab	4.3L V6	4WD	42.8	40.5
1500 Crew Cab Denali	5.3L V8	RWD	42.8	40.5
1500 Crew Cab Denali	5.3L V8	4WD	42.8	40.5
1500 Crew Cab SLE	4.3L V6	RWD	42.8	40.5
1500 Crew Cab SLE	4.3L V6	4WD	42.8	40.5
1500 Crew Cab SLT	5.3L V8	RWD	42.8	40.5
1500 Crew Cab SLT	5.3L V8	4WD	42.8	40.5
1500 Crew Cab SLT eAssist	5.3L V8	RWD	42.8	40.5
1500 Crew Cab SLT eAssist	5.3L V8	4WD	42.8	40.5
1500 Extended Cab	4.3L V6	RWD	42.8	38.7
1500 Extended Cab	4.3L V6	4WD	42.8	38.7
1500 Extended Cab SLE	4.3L V6	RWD	42.8	38.7
1500 Extended Cab SLE	4.3L V6	4WD	42.8	38.7
1500 Extended Cab SLT	5.3L V8	RWD	42.8	38.7
1500 Extended Cab SLT	5.3L V8	4WD	42.8	38.7
1500 Regular Cab	4.3L V6	RWD	42.4
1500 Regular Cab	4.3L V6	4WD	42.4
1500 Regular Cab SLE	4.3L V6	RWD	42.4
1500 Regular Cab SLE	4.3L V6	4WD	42.4

Trim	Eng.	Drive train	1st Row Headroom (in)	2nd Row Headroom (in)
1500 Extended Cab SLE	4.8L V8	4WD	41.5	39.3
1500 Regular Cab SLE	4.3L V6	4WD	41.5
1500 Crew Cab SL	4.8L V8	RWD	41.5	40.6
1500 Crew Cab SL	4.8L V8	4WD	41.5	40.6
1500 Crew Cab SLE	4.8L V8	RWD	41.5	40.6
1500 Crew Cab SLE	4.8L V8	4WD	41.5	40.6
1500 Crew Cab SLT	5.3L V8	RWD	41.5	40.6
1500 Crew Cab SLT	5.3L V8	4WD	41.5	40.6
1500 Extended Cab SLE	4.3L V6	RWD	41.5	39.3
1500 Extended Cab SLT	5.3L V8	RWD	41.5	39.3
1500 Extended Cab SLT	5.3L V8	4WD	41.5	39.3
1500 Regular Cab SLE	4.3L V6	RWD	41.5
Classic 1500 Crew Cab SL	4.8L V8	RWD	40.7	40.2
Classic 1500 Crew Cab SL	4.8L V8	4WD	40.7	40.2
Classic 1500 Crew Cab SLE	5.3L V8	RWD	40.7	40.2
Classic 1500 Crew Cab SLE	5.3L V8	4WD	40.7	40.2
Classic 1500 Crew Cab SLT	5.3L V8	RWD	40.7	40.2
Classic 1500 Crew Cab SLT	5.3L V8	4WD	40.7	40.2
Classic 1500 Extended Cab SLT	5.3L V8	RWD	41	38.4
Classic 1500 Extended Cab SLT	5.3L V8	4WD	41	38.4
Classic 1500 Extended Cab SLE	5.3L V8	RWD	41	38.4
Classic 1500 Extended Cab SLE	5.3L V8	4WD	41	38.4
HD Classic 1500 Crew Cab SLE	6.0L V8	RWD	41.1	39.9
HD Classic 1500 Crew Cab SLE	6.0L V8	4WD	41.1	39.9
HD Classic 1500 Crew Cab SLT	6.0L V8	RWD	41.1	39.9
HD Classic 1500 Crew Cab SLT	6.0L V8	4WD	41.1	39.9
Crew Cab Denali	6.2L V8	RWD	41.5	40.6
Crew Cab Denali	6.2L V8	AWD	41.5	40.6
Crew Cab Denali	6.0L V8	AWD	40.7	40.2

Trim	Eng.	Drive train	1st Row Headroom (cm)	2nd Row Headroom (cm)
1500 Crew Cab	4.3L V6	RWD	108.7	102.9
1500 Crew Cab	4.3L V6	4WD	108.7	102.9
1500 Crew Cab Denali	5.3L V8	RWD	108.7	102.9
1500 Crew Cab Denali	5.3L V8	4WD	108.7	102.9
1500 Crew Cab SLE	4.3L V6	RWD	108.7	102.9
1500 Crew Cab SLE	4.3L V6	4WD	108.7	102.9
1500 Crew Cab SLT	5.3L V8	RWD	108.7	102.9
1500 Crew Cab SLT	5.3L V8	4WD	108.7	102.9
1500 Crew Cab SLT eAssist	5.3L V8	RWD	108.7	102.9
1500 Crew Cab SLT eAssist	5.3L V8	4WD	108.7	102.9
1500 Extended Cab	4.3L V6	RWD	108.7	98.3
1500 Extended Cab	4.3L V6	4WD	108.7	98.3
1500 Extended Cab SLE	4.3L V6	RWD	108.7	98.3
1500 Extended Cab SLE	4.3L V6	4WD	108.7	98.3
1500 Extended Cab SLT	5.3L V8	RWD	108.7	98.3
1500 Extended Cab SLT	5.3L V8	4WD	108.7	98.3
1500 Regular Cab	4.3L V6	RWD	107.7
1500 Regular Cab	4.3L V6	4WD	107.7
1500 Regular Cab SLE	4.3L V6	RWD	107.7
1500 Regular Cab SLE	4.3L V6	4WD	107.7

Trim	Eng.	Drive train	1st Row Headroom (cm)	2nd Row Headroom (cm)
1500 Extended Cab SLE	4.8L V8	4WD	105.4	99.8
1500 Regular Cab SLE	4.3L V6	4WD	105.4
1500 Crew Cab SL	4.8L V8	RWD	105.4	103.1
1500 Crew Cab SL	4.8L V8	4WD	105.4	103.1
1500 Crew Cab SLE	4.8L V8	RWD	105.4	103.1
1500 Crew Cab SLE	4.8L V8	4WD	105.4	103.1
1500 Crew Cab SLT	5.3L V8	RWD	105.4	103.1
1500 Crew Cab SLT	5.3L V8	4WD	105.4	103.1
1500 Extended Cab SLE	4.3L V6	RWD	105.4	99.8
1500 Extended Cab SLT	5.3L V8	RWD	105.4	99.8
1500 Extended Cab SLT	5.3L V8	4WD	105.4	99.8
1500 Regular Cab SLE	4.3L V6	RWD	105.4
Classic 1500 Crew Cab SL	4.8L V8	RWD	103.4	102.1
Classic 1500 Crew Cab SL	4.8L V8	4WD	103.4	102.1
Classic 1500 Crew Cab SLE	5.3L V8	RWD	103.4	102.1
Classic 1500 Crew Cab SLE	5.3L V8	4WD	103.4	102.1
Classic 1500 Crew Cab SLT	5.3L V8	RWD	103.4	102.1
Classic 1500 Crew Cab SLT	5.3L V8	4WD	103.4	102.1
Classic 1500 Extended Cab SLT	5.3L V8	RWD	104.1	97.5
Classic 1500 Extended Cab SLT	5.3L V8	4WD	104.1	97.5
Classic 1500 Extended Cab SLE	5.3L V8	RWD	104.1	97.5
Classic 1500 Extended Cab SLE	5.3L V8	4WD	104.1	97.5
HD Classic 1500 Crew Cab SLE	6.0L V8	RWD	104.4	101.3
HD Classic 1500 Crew Cab SLE	6.0L V8	4WD	104.4	101.3
HD Classic 1500 Crew Cab SLT	6.0L V8	RWD	104.4	101.3
HD Classic 1500 Crew Cab SLT	6.0L V8	4WD	104.4	101.3
Crew Cab Denali	6.2L V8	RWD	105.4	103.1
Crew Cab Denali	6.2L V8	AWD	105.4	103.1
Crew Cab Denali	6.0L V8	AWD	103.4	102.1