Specifications Comparison: 2021 GMC Sierra 1500 vs 2015 GMC Sierra 1500

Legroom

2021 GMC Sierra 1500

Legroom (Imp.)

Trim	Eng.	Drive train	1st Row Legroom (in)	2nd Row Legroom (in)
Crew Cab	4.3L V6	RWD	44	43
Crew Cab	5.3L V8	RWD	44	43
Crew Cab	2.7L	RWD	44	43
Crew Cab	4.3L V6	4WD	44	43
Crew Cab	5.3L V8	4WD	44	43
Crew Cab	2.7L	4WD	44	43
Crew Cab AT4	5.3L V8	4WD	44	43
Crew Cab AT4	3.0L I6	4WD	44	43
Crew Cab AT4	6.2L V8	4WD	44	43
Crew Cab Denali	5.3L V8	RWD	44	43
Crew Cab Denali	3.0L I6	RWD	44	43
Crew Cab Denali	5.3L V8	4WD	44	43
Crew Cab Denali	3.0L I6	4WD	44	43
Crew Cab Denali	6.2L V8	4WD	44	43
Crew Cab Elevation	2.7L	RWD	44	43
Crew Cab Elevation	5.3L V8	RWD	44	43
Crew Cab Elevation	3.0L I6	RWD	44	43
Crew Cab Elevation 3VL	2.7L	4WD	44	43
Crew Cab Elevation	2.7L	4WD	44	43
Crew Cab Elevation	5.3L V8	4WD	44	43
Crew Cab Elevation	3.0L I6	4WD	44	43
Crew Cab SLE	2.7L	RWD	44	43
Crew Cab SLE	5.3L V8	RWD	44	43
Crew Cab SLE	3.0L I6	RWD	44	43
Crew Cab SLE	2.7L	4WD	44	43
Crew Cab SLE	5.3L V8	4WD	44	43
Crew Cab SLE	3.0L I6	4WD	44	43
Crew Cab SLT	5.3L V8	RWD	44	43
Crew Cab SLT	3.0L I6	RWD	44	43
Crew Cab SLT	5.3L V8	4WD	44	43
Crew Cab SLT	5.3L I6	4WD	44	43
Crew Cab SLT	3.0L V8	4WD	44	43
Extended Cab	4.3L V6	RWD	44	35
Extended Cab	5.3L V8	RWD	44	35
Extended Cab	2.7L	RWD	44	35
Extended Cab	4.3L V6	4WD	44	35
Extended Cab	5.3L V8	4WD	44	35
Extended Cab	2.7L	4WD	44	35
Extended Cab Elevation	2.7L	RWD	44	35
Extended Cab Elevation	5.3L V8	RWD	44	35
Extended Cab Elevation	3.0L I6	RWD	44	35
Extended Cab Elevation 3VL	2.7L	4WD	44	35
Extended Cab Elevation	2.7L	4WD	44	35
Extended Cab Elevation	5.3L V8	4WD	44	35
Extended Cab Elevation	3.0L I6	4WD	44	35
Extended Cab SLE	2.7L	RWD	44	35
Extended Cab SLE	5.3L V8	RWD	44	35
Extended Cab SLE	3.0L I6	RWD	44	35
Extended Cab SLE	2.7L	4WD	44	35
Extended Cab SLE	5.3L V8	4WD	44	35
Extended Cab SLE	3.0L I6	4WD	44	35
Regular Cab	4.3L V6	RWD	44
Regular Cab	5.3L V8	RWD	44
Regular Cab	4.3L V6	4WD	44
Regular Cab	5.3L V8	4WD	44

2015 GMC Sierra 1500

Legroom (Imp.)

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 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

2021 GMC Sierra 1500

Legroom (Metric)

Trim	Eng.	Drive train	1st Row Legroom (cm)	2nd Row Legroom (cm)
Crew Cab	4.3L V6	RWD	111	109
Crew Cab	5.3L V8	RWD	111	109
Crew Cab	2.7L	RWD	111	109
Crew Cab	4.3L V6	4WD	111	109
Crew Cab	5.3L V8	4WD	111	109
Crew Cab	2.7L	4WD	111	109
Crew Cab AT4	5.3L V8	4WD	111	109
Crew Cab AT4	3.0L I6	4WD	111	109
Crew Cab AT4	6.2L V8	4WD	111	109
Crew Cab Denali	5.3L V8	RWD	111	109
Crew Cab Denali	3.0L I6	RWD	111	109
Crew Cab Denali	5.3L V8	4WD	111	109
Crew Cab Denali	3.0L I6	4WD	111	109
Crew Cab Denali	6.2L V8	4WD	111	109
Crew Cab Elevation	2.7L	RWD	111	109
Crew Cab Elevation	5.3L V8	RWD	111	109
Crew Cab Elevation	3.0L I6	RWD	111	109
Crew Cab Elevation 3VL	2.7L	4WD	111	109
Crew Cab Elevation	2.7L	4WD	111	109
Crew Cab Elevation	5.3L V8	4WD	111	109
Crew Cab Elevation	3.0L I6	4WD	111	109
Crew Cab SLE	2.7L	RWD	111	109
Crew Cab SLE	5.3L V8	RWD	111	109
Crew Cab SLE	3.0L I6	RWD	111	109
Crew Cab SLE	2.7L	4WD	111	109
Crew Cab SLE	5.3L V8	4WD	111	109
Crew Cab SLE	3.0L I6	4WD	111	109
Crew Cab SLT	5.3L V8	RWD	111	109
Crew Cab SLT	3.0L I6	RWD	111	109
Crew Cab SLT	5.3L V8	4WD	111	109
Crew Cab SLT	5.3L I6	4WD	111	109
Crew Cab SLT	3.0L V8	4WD	111	109
Extended Cab	4.3L V6	RWD	111	88
Extended Cab	5.3L V8	RWD	111	88
Extended Cab	2.7L	RWD	111	88
Extended Cab	4.3L V6	4WD	111	88
Extended Cab	5.3L V8	4WD	111	88
Extended Cab	2.7L	4WD	111	88
Extended Cab Elevation	2.7L	RWD	111	88
Extended Cab Elevation	5.3L V8	RWD	111	88
Extended Cab Elevation	3.0L I6	RWD	111	88
Extended Cab Elevation 3VL	2.7L	4WD	111	88
Extended Cab Elevation	2.7L	4WD	111	88
Extended Cab Elevation	5.3L V8	4WD	111	88
Extended Cab Elevation	3.0L I6	4WD	111	88
Extended Cab SLE	2.7L	RWD	111	88
Extended Cab SLE	5.3L V8	RWD	111	88
Extended Cab SLE	3.0L I6	RWD	111	88
Extended Cab SLE	2.7L	4WD	111	88
Extended Cab SLE	5.3L V8	4WD	111	88
Extended Cab SLE	3.0L I6	4WD	111	88
Regular Cab	4.3L V6	RWD	111
Regular Cab	5.3L V8	RWD	111
Regular Cab	4.3L V6	4WD	111
Regular Cab	5.3L V8	4WD	111

2015 GMC Sierra 1500

Legroom (Metric)

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 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