Specifications Comparison: 2024 GMC Sierra 1500 vs 2021 GMC Sierra 1500

Headroom

2024 GMC Sierra 1500

Headroom (Imp.)

Trim	Eng.	Drive train	1st Row Headroom (in)	2nd Row Headroom (in)
Denali Crew Cab 147"	5.3L V8	RWD	43.03	40.12
Denali Crew Cab 147"	5.3L V8	4WD	43.03	40.12
Denali Crew Cab 157"	5.3L V8	4WD	43.03	40.12
Elevation Crew Cab 147"		RWD	43.03	40.12
Elevation Double Cab 147"		RWD	43.03	39.88
Elevation Crew Cab 147" w/3SB		4WD	43.03	40.12
Elevation Crew Cab 147" w/3VL		4WD	43.03	40.12
Elevation Crew Cab 157"		4WD	43.03	40.12
Elevation Double Cab 147" w/3SB		4WD	43.03	39.88
Elevation Double Cab 147" w/3VL		4WD	43.03	39.88
Pro Crew Cab 147"		RWD	43.03	40.12
Pro Double Cab 147"		RWD	43.03	39.88
Pro Reg Cab 126"		RWD	43.11
Pro Reg Cab 140"		RWD	43.11
Pro Crew Cab 147"		4WD	43.03	40.12
Pro Crew Cab 157"		4WD	43.03	40.12
Pro Double Cab 147"		4WD	43.03	39.88
Pro Reg Cab 126"		4WD	43.11
Pro Reg Cab 140"		4WD	43.11
SLE Crew Cab 147"		RWD	43.03	40.12
SLE Double Cab 147"		RWD	43.03	39.88
SLE Crew Cab 147"		4WD	43.03	40.12
SLE Crew Cab 157"		4WD	43.03	40.12
SLE Double Cab 147"		4WD	43.03	39.88
SLT Crew Cab 147"	5.3L V8	RWD	43.03	40.12
SLT Crew Cab 147"	5.3L V8	4WD	43.03	40.12
SLT Crew Cab 157"	5.3L V8	4WD	43.03	40.12
AT4 Crew Cab 147"	3.0L I6	4WD	43.03	40.12
AT4 Crew Cab 157"	3.0L I6	4WD	43.03	40.12
AT4X Crew Cab 147"	3.0L I6	4WD	43.03	40.12
Denali Ultimate Crew Cab 147"	6.2L V8	4WD	43.03	40.12

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

2024 GMC Sierra 1500

Headroom (Metric)

Trim	Eng.	Drive train	1st Row Headroom (cm)	2nd Row Headroom (cm)
Denali Crew Cab 147"	5.3L V8	RWD	109	102
Denali Crew Cab 147"	5.3L V8	4WD	109	102
Denali Crew Cab 157"	5.3L V8	4WD	109	102
Elevation Crew Cab 147"		RWD	109	102
Elevation Double Cab 147"		RWD	109	101
Elevation Crew Cab 147" w/3SB		4WD	109	102
Elevation Crew Cab 147" w/3VL		4WD	109	102
Elevation Crew Cab 157"		4WD	109	102
Elevation Double Cab 147" w/3SB		4WD	109	101
Elevation Double Cab 147" w/3VL		4WD	109	101
Pro Crew Cab 147"		RWD	109	102
Pro Double Cab 147"		RWD	109	101
Pro Reg Cab 126"		RWD	109
Pro Reg Cab 140"		RWD	109
Pro Crew Cab 147"		4WD	109	102
Pro Crew Cab 157"		4WD	109	102
Pro Double Cab 147"		4WD	109	101
Pro Reg Cab 126"		4WD	109
Pro Reg Cab 140"		4WD	109
SLE Crew Cab 147"		RWD	109	102
SLE Double Cab 147"		RWD	109	101
SLE Crew Cab 147"		4WD	109	102
SLE Crew Cab 157"		4WD	109	102
SLE Double Cab 147"		4WD	109	101
SLT Crew Cab 147"	5.3L V8	RWD	109	102
SLT Crew Cab 147"	5.3L V8	4WD	109	102
SLT Crew Cab 157"	5.3L V8	4WD	109	102
AT4 Crew Cab 147"	3.0L I6	4WD	109	102
AT4 Crew Cab 157"	3.0L I6	4WD	109	102
AT4X Crew Cab 147"	3.0L I6	4WD	109	102
Denali Ultimate Crew Cab 147"	6.2L V8	4WD	109	102

2024 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