Specifications Comparison: 2006 GMC Sierra 1500 vs 2018 GMC Sierra 1500

Headroom

Trim	Eng.	Drive train	1st Row Headroom (in)	2nd Row Headroom (in)
1500 Extended Cab SL	V6	RWD	41	38.4
1500 Extended Cab SL	V8	4WD	41	38.4
1500 Extended Cab SLE	V8	RWD	41
1500 Extended Cab SLE	V8	4WD	41	38.4
1500 Regular Cab SL	V6	RWD	41
1500 Regular Cab SL	V6	4WD	41
1500 Regular Cab SLE	V8	RWD	41
1500 Regular Cab SLE	V8	4WD	41
1500 Crew Cab SL	V8	RWD	40.7	40.2
1500 Crew Cab SL	V8	4WD	40.7	40.2
1500 Crew Cab SLE	V8	RWD	40.7	40.2
1500 Crew Cab SLE	V8	4WD	40.7	40.2
1500 Crew Cab SLT	V8	RWD	40.7	40.2
1500 Crew Cab SLT	V8	4WD	40.7	40.2
1500 Extended Cab SLT	V8	RWD	41	38.4
1500 Extended Cab SLT	V8	4WD	41	38.4
1500 Extended Cab SLE	V8	RWD	41	38.4
1500 Extended Cab SLE	V8	4WD	41	38.4
HD 1500 Crew Cab SLE	V8	RWD	41.1	39.9
HD 1500 Crew Cab SLE	V8	4WD	41.1	39.9
HD 1500 Crew Cab SLT	V8	RWD	41.1	39.9
HD 1500 Crew Cab SLT	V8	4WD	41.1	39.9
Crew Cab Denali	V8	AWD	40.7	40.2

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 (cm)	2nd Row Headroom (cm)
1500 Extended Cab SL	V6	RWD	104.1	97.5
1500 Extended Cab SL	V8	4WD	104.1	97.5
1500 Extended Cab SLE	V8	RWD	104.1
1500 Extended Cab SLE	V8	4WD	104.1	97.5
1500 Regular Cab SL	V6	RWD	104.1
1500 Regular Cab SL	V6	4WD	104.1
1500 Regular Cab SLE	V8	RWD	104.1
1500 Regular Cab SLE	V8	4WD	104.1
1500 Crew Cab SL	V8	RWD	103.4	102.1
1500 Crew Cab SL	V8	4WD	103.4	102.1
1500 Crew Cab SLE	V8	RWD	103.4	102.1
1500 Crew Cab SLE	V8	4WD	103.4	102.1
1500 Crew Cab SLT	V8	RWD	103.4	102.1
1500 Crew Cab SLT	V8	4WD	103.4	102.1
1500 Extended Cab SLT	V8	RWD	104.1	97.5
1500 Extended Cab SLT	V8	4WD	104.1	97.5
1500 Extended Cab SLE	V8	RWD	104.1	97.5
1500 Extended Cab SLE	V8	4WD	104.1	97.5
HD 1500 Crew Cab SLE	V8	RWD	104.4	101.3
HD 1500 Crew Cab SLE	V8	4WD	104.4	101.3
HD 1500 Crew Cab SLT	V8	RWD	104.4	101.3
HD 1500 Crew Cab SLT	V8	4WD	104.4	101.3
Crew Cab Denali	V8	AWD	103.4	102.1

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