Specifications Comparison: 2021 GMC Sierra 3500 vs 2024 Chevrolet Silverado 3500

Headroom

Trim	Eng.	Drive train	1st Row Headroom (in)	2nd Row Headroom (in)
HD Crew Cab	6.6L V8	RWD	43	40
HD Crew Cab	6.6L V8	RWD	43	40
HD Crew Cab	6.6L V8	4WD	43	40
HD Crew Cab	6.6L V8	4WD	43	40
HD Crew Cab AT4	6.6L V8	4WD	43	40
HD Crew Cab AT4	6.6L V8	4WD	43	40
HD Crew Cab Denali	6.6L V8	4WD	43	40
HD Crew Cab Denali	6.6L V8	4WD	43	40
HD Crew Cab SLE	6.6L V8	RWD	43	40
HD Crew Cab SLE	6.6L V8	RWD	43	40
HD Crew Cab SLE	6.6L V8	4WD	43	40
HD Crew Cab SLE	6.6L V8	4WD	43	40
HD Crew Cab SLT	6.6L V8	RWD	43	40
HD Crew Cab SLT	6.6L V8	RWD	43	40
HD Crew Cab SLT	6.6L V8	4WD	43	40
HD Crew Cab SLT	6.6L V8	4WD	43	40
HD Extended Cab	6.6L V8	RWD	43	39
HD Extended Cab	6.6L V8	RWD	43	39
HD Extended Cab	6.6L V8	4WD	43	39
HD Extended Cab	6.6L V8	4WD	43	39
HD Extended Cab SLE	6.6L V8	RWD	43	39
HD Extended Cab SLE	6.6L V8	RWD	43	39
HD Extended Cab SLE	6.6L V8	4WD	43	39
HD Extended Cab SLE	6.6L V8	4WD	43	39
HD Regular Cab	6.6L V8	RWD	43
HD Regular Cab	6.6L V8	RWD	43
HD Regular Cab	6.6L V8	4WD	43
HD Regular Cab	6.6L V8	4WD	43
HD Regular Cab SLE	6.6L V8	RWD	43
HD Regular Cab SLE	6.6L V8	RWD	43
HD Regular Cab SLE	6.6L V8	4WD	43
HD Regular Cab SLE	6.6L V8	4WD	43

Trim	Eng.	Drive train	1st Row Headroom (in)	2nd Row Headroom (in)
HD LT Crew Cab 159"	6.6L V8	RWD	43.03	40.12
HD LT Crew Cab 172"	6.6L V8	RWD	43.03	40.12
HD LT Double Cab 162"	6.6L V8	RWD	43.03	39.88
HD LT Reg Cab 142"	6.6L V8	RWD	43.11
HD LT Crew Cab 159"	6.6L V8	4WD	43.03	40.12
HD LT Crew Cab 172"	6.6L V8	4WD	43.03	40.12
HD LT Double Cab 162"	6.6L V8	4WD	43.03	39.88
HD LT Reg Cab 142"	6.6L V8	4WD	43.11
HD LTZ Crew Cab 159"	6.6L V8	RWD	43.03	40.12
HD LTZ Crew Cab 172"	6.6L V8	RWD	43.03	40.12
HD LTZ Crew Cab 159"	6.6L V8	4WD	43.03	40.12
HD LTZ Crew Cab 172"	6.6L V8	4WD	43.03	40.12
HD Work Crew Cab 159"	6.6L V8	RWD	43.03	40.12
HD Work Crew Cab 172"	6.6L V8	RWD	43.03	40.12
HD Work Double Cab 162"	6.6L V8	RWD	43.03	39.88
HD Work Reg Cab 142"	6.6L V8	RWD	43.11
HD Work Crew Cab 159"	6.6L V8	4WD	43.03	40.12
HD Work Crew Cab 172"	6.6L V8	4WD	43.03	40.12
HD Work Double Cab 162"	6.6L V8	4WD	43.03	39.88
HD Work Reg Cab 142"	6.6L V8	4WD	43.11
HD High Country Crew Cab 159"	6.6L V8	4WD	43.03	40.12
HD High Country Crew Cab 172"	6.6L V8	4WD	43.03	40.12

Trim	Eng.	Drive train	1st Row Headroom (cm)	2nd Row Headroom (cm)
HD Crew Cab	6.6L V8	RWD	109	101
HD Crew Cab	6.6L V8	RWD	109	101
HD Crew Cab	6.6L V8	4WD	109	101
HD Crew Cab	6.6L V8	4WD	109	101
HD Crew Cab AT4	6.6L V8	4WD	109	101
HD Crew Cab AT4	6.6L V8	4WD	109	101
HD Crew Cab Denali	6.6L V8	4WD	109	101
HD Crew Cab Denali	6.6L V8	4WD	109	101
HD Crew Cab SLE	6.6L V8	RWD	109	101
HD Crew Cab SLE	6.6L V8	RWD	109	101
HD Crew Cab SLE	6.6L V8	4WD	109	101
HD Crew Cab SLE	6.6L V8	4WD	109	101
HD Crew Cab SLT	6.6L V8	RWD	109	101
HD Crew Cab SLT	6.6L V8	RWD	109	101
HD Crew Cab SLT	6.6L V8	4WD	109	101
HD Crew Cab SLT	6.6L V8	4WD	109	101
HD Extended Cab	6.6L V8	RWD	109	99
HD Extended Cab	6.6L V8	RWD	109	99
HD Extended Cab	6.6L V8	4WD	109	99
HD Extended Cab	6.6L V8	4WD	109	99
HD Extended Cab SLE	6.6L V8	RWD	109	99
HD Extended Cab SLE	6.6L V8	RWD	109	99
HD Extended Cab SLE	6.6L V8	4WD	109	99
HD Extended Cab SLE	6.6L V8	4WD	109	99
HD Regular Cab	6.6L V8	RWD	109
HD Regular Cab	6.6L V8	RWD	109
HD Regular Cab	6.6L V8	4WD	109
HD Regular Cab	6.6L V8	4WD	109
HD Regular Cab SLE	6.6L V8	RWD	109
HD Regular Cab SLE	6.6L V8	RWD	109
HD Regular Cab SLE	6.6L V8	4WD	109
HD Regular Cab SLE	6.6L V8	4WD	109

Trim	Eng.	Drive train	1st Row Headroom (cm)	2nd Row Headroom (cm)
HD LT Crew Cab 159"	6.6L V8	RWD	109	102
HD LT Crew Cab 172"	6.6L V8	RWD	109	102
HD LT Double Cab 162"	6.6L V8	RWD	109	101
HD LT Reg Cab 142"	6.6L V8	RWD	109
HD LT Crew Cab 159"	6.6L V8	4WD	109	102
HD LT Crew Cab 172"	6.6L V8	4WD	109	102
HD LT Double Cab 162"	6.6L V8	4WD	109	101
HD LT Reg Cab 142"	6.6L V8	4WD	109
HD LTZ Crew Cab 159"	6.6L V8	RWD	109	102
HD LTZ Crew Cab 172"	6.6L V8	RWD	109	102
HD LTZ Crew Cab 159"	6.6L V8	4WD	109	102
HD LTZ Crew Cab 172"	6.6L V8	4WD	109	102
HD Work Crew Cab 159"	6.6L V8	RWD	109	102
HD Work Crew Cab 172"	6.6L V8	RWD	109	102
HD Work Double Cab 162"	6.6L V8	RWD	109	101
HD Work Reg Cab 142"	6.6L V8	RWD	109
HD Work Crew Cab 159"	6.6L V8	4WD	109	102
HD Work Crew Cab 172"	6.6L V8	4WD	109	102
HD Work Double Cab 162"	6.6L V8	4WD	109	101
HD Work Reg Cab 142"	6.6L V8	4WD	109
HD High Country Crew Cab 159"	6.6L V8	4WD	109	102
HD High Country Crew Cab 172"	6.6L V8	4WD	109	102