Specifications Comparison: 2006 GMC Sierra 1500 vs 2021 GMC Sierra 1500

Headroom

2006 GMC Sierra 1500

Headroom (Imp.)

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

2021 GMC Sierra 1500

Headroom (Imp.)

Trim	Eng.	Drive train	1st Row Headroom (in)	2nd Row Headroom (in)
Crew Cab	4.3L V6	RWD	43	40
Crew Cab	5.3L V8	RWD	43	40
Crew Cab	2.7L	RWD	43	40
Crew Cab	4.3L V6	4WD	43	40
Crew Cab	5.3L V8	4WD	43	40
Crew Cab	2.7L	4WD	43	40
Crew Cab AT4	5.3L V8	4WD	43	40
Crew Cab AT4	3.0L I6	4WD	43	40
Crew Cab AT4	6.2L V8	4WD	43	40
Crew Cab Denali	5.3L V8	RWD	43	40
Crew Cab Denali	3.0L I6	RWD	43	40
Crew Cab Denali	5.3L V8	4WD	43	40
Crew Cab Denali	3.0L I6	4WD	43	40
Crew Cab Denali	6.2L V8	4WD	43	40
Crew Cab Elevation	2.7L	RWD	43	40
Crew Cab Elevation	5.3L V8	RWD	43	40
Crew Cab Elevation	3.0L I6	RWD	43	40
Crew Cab Elevation 3VL	2.7L	4WD	43	40
Crew Cab Elevation	2.7L	4WD	43	40
Crew Cab Elevation	5.3L V8	4WD	43	40
Crew Cab Elevation	3.0L I6	4WD	43	40
Crew Cab SLE	2.7L	RWD	43	40
Crew Cab SLE	5.3L V8	RWD	43	40
Crew Cab SLE	3.0L I6	RWD	43	40
Crew Cab SLE	2.7L	4WD	43	40
Crew Cab SLE	5.3L V8	4WD	43	40
Crew Cab SLE	3.0L I6	4WD	43	40
Crew Cab SLT	5.3L V8	RWD	43	40
Crew Cab SLT	3.0L I6	RWD	43	40
Crew Cab SLT	5.3L V8	4WD	43	40
Crew Cab SLT	5.3L I6	4WD	43	40
Crew Cab SLT	3.0L V8	4WD	43	40
Extended Cab	4.3L V6	RWD	43	39
Extended Cab	5.3L V8	RWD	43	39
Extended Cab	2.7L	RWD	43	39
Extended Cab	4.3L V6	4WD	43	39
Extended Cab	5.3L V8	4WD	43	39
Extended Cab	2.7L	4WD	43	39
Extended Cab Elevation	2.7L	RWD	43	39
Extended Cab Elevation	5.3L V8	RWD	43	39
Extended Cab Elevation	3.0L I6	RWD	43	39
Extended Cab Elevation 3VL	2.7L	4WD	43	39
Extended Cab Elevation	2.7L	4WD	43	39
Extended Cab Elevation	5.3L V8	4WD	43	39
Extended Cab Elevation	3.0L I6	4WD	43	39
Extended Cab SLE	2.7L	RWD	43	39
Extended Cab SLE	5.3L V8	RWD	43	39
Extended Cab SLE	3.0L I6	RWD	43	39
Extended Cab SLE	2.7L	4WD	43	39
Extended Cab SLE	5.3L V8	4WD	43	39
Extended Cab SLE	3.0L I6	4WD	43	39
Regular Cab	4.3L V6	RWD	43
Regular Cab	5.3L V8	RWD	43
Regular Cab	4.3L V6	4WD	43
Regular Cab	5.3L V8	4WD	43

2006 GMC Sierra 1500

Headroom (Metric)

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

2006 GMC Sierra 1500

Headroom (Metric)

Trim	Eng.	Drive train	1st Row Headroom (cm)	2nd Row Headroom (cm)
Crew Cab	4.3L V6	RWD	109	101
Crew Cab	5.3L V8	RWD	109	101
Crew Cab	2.7L	RWD	109	101
Crew Cab	4.3L V6	4WD	109	101
Crew Cab	5.3L V8	4WD	109	101
Crew Cab	2.7L	4WD	109	101
Crew Cab AT4	5.3L V8	4WD	109	101
Crew Cab AT4	3.0L I6	4WD	109	101
Crew Cab AT4	6.2L V8	4WD	109	101
Crew Cab Denali	5.3L V8	RWD	109	101
Crew Cab Denali	3.0L I6	RWD	109	101
Crew Cab Denali	5.3L V8	4WD	109	101
Crew Cab Denali	3.0L I6	4WD	109	101
Crew Cab Denali	6.2L V8	4WD	109	101
Crew Cab Elevation	2.7L	RWD	109	101
Crew Cab Elevation	5.3L V8	RWD	109	101
Crew Cab Elevation	3.0L I6	RWD	109	101
Crew Cab Elevation 3VL	2.7L	4WD	109	101
Crew Cab Elevation	2.7L	4WD	109	101
Crew Cab Elevation	5.3L V8	4WD	109	101
Crew Cab Elevation	3.0L I6	4WD	109	101
Crew Cab SLE	2.7L	RWD	109	101
Crew Cab SLE	5.3L V8	RWD	109	101
Crew Cab SLE	3.0L I6	RWD	109	101
Crew Cab SLE	2.7L	4WD	109	101
Crew Cab SLE	5.3L V8	4WD	109	101
Crew Cab SLE	3.0L I6	4WD	109	101
Crew Cab SLT	5.3L V8	RWD	109	101
Crew Cab SLT	3.0L I6	RWD	109	101
Crew Cab SLT	5.3L V8	4WD	109	101
Crew Cab SLT	5.3L I6	4WD	109	101
Crew Cab SLT	3.0L V8	4WD	109	101
Extended Cab	4.3L V6	RWD	109	99
Extended Cab	5.3L V8	RWD	109	99
Extended Cab	2.7L	RWD	109	99
Extended Cab	4.3L V6	4WD	109	99
Extended Cab	5.3L V8	4WD	109	99
Extended Cab	2.7L	4WD	109	99
Extended Cab Elevation	2.7L	RWD	109	99
Extended Cab Elevation	5.3L V8	RWD	109	99
Extended Cab Elevation	3.0L I6	RWD	109	99
Extended Cab Elevation 3VL	2.7L	4WD	109	99
Extended Cab Elevation	2.7L	4WD	109	99
Extended Cab Elevation	5.3L V8	4WD	109	99
Extended Cab Elevation	3.0L I6	4WD	109	99
Extended Cab SLE	2.7L	RWD	109	99
Extended Cab SLE	5.3L V8	RWD	109	99
Extended Cab SLE	3.0L I6	RWD	109	99
Extended Cab SLE	2.7L	4WD	109	99
Extended Cab SLE	5.3L V8	4WD	109	99
Extended Cab SLE	3.0L I6	4WD	109	99
Regular Cab	4.3L V6	RWD	109
Regular Cab	5.3L V8	RWD	109
Regular Cab	4.3L V6	4WD	109
Regular Cab	5.3L V8	4WD	109