Specifications Comparison: 2020 GMC Sierra 3500 vs 2021 GMC Sierra 3500

Legroom

2020 GMC Sierra 3500

Legroom (Imp.)

Trim	Eng.	Drive train	1st Row Legroom (in)	2nd Row Legroom (in)
HD 3500 Crew Cab 159" AT4	6.6L V8	4WD	44.5	43.4
HD 3500 Crew Cab 172" AT4	6.6L V8	4WD	44.5	43.4
HD 3500 Crew Cab 159"	6.6L V8	RWD	44.5	43.4
HD 3500 Crew Cab 172"	6.6L V8	RWD	44.5	43.4
HD 3500 Double Cab 162"	6.6L V8	RWD	44.5	35.2
HD 3500 Reg Cab 142"	6.6L V8	RWD	44.5
HD 3500 Crew Cab 159"	6.6L V8	4WD	44.5	43.4
HD 3500 Crew Cab 172"	6.6L V8	4WD	44.5	43.4
HD 3500 Double Cab 162"	6.6L V8	4WD	44.5	35.2
HD 3500 Reg Cab 142"	6.6L V8	4WD	44.5
HD 3500 Crew Cab 159" Denali	6.6L V8	4WD	44.5	43.4
HD 3500 Crew Cab 172" Denali	6.6L V8	4WD	44.5	43.4
HD 3500 Crew Cab 159" SLE	6.6L V8	RWD	44.5	43.4
HD 3500 Crew Cab 172" SLE	6.6L V8	RWD	44.5	43.4
HD 3500 Double Cab 162" SLE	6.6L V8	RWD	44.5	35.2
HD 3500 Reg Cab 142" SLE	6.6L V8	RWD	44.5
HD 3500 Crew Cab 159" SLE	6.6L V8	4WD	44.5	43.4
HD 3500 Crew Cab 172" SLE	6.6L V8	4WD	44.5	43.4
HD 3500 Double Cab 162" SLE	6.6L V8	4WD	44.5	35.2
HD 3500 Reg Cab 142" SLE	6.6L V8	4WD	44.5
HD 3500 Crew Cab 159" SLT	6.6L V8	RWD	44.5	43.4
HD 3500 Crew Cab 172" SLT	6.6L V8	RWD	44.5	43.4
HD 3500 Crew Cab 159" SLT	6.6L V8	4WD	44.5	43.4
HD 3500 Crew Cab 172" SLT	6.6L V8	4WD	44.5	43.4
HD 3500 Crew Cab	6.6L V8	RWD	44.5	43.4
HD 3500 Crew Cab	6.6L V8	4WD	44.5	43.4
HD 3500 Crew Cab AT4	6.6L V8	4WD	44.5	43.4
HD 3500 Crew Cab Denali	6.6L V8	4WD	44.5	43.4
HD 3500 Crew Cab SLE	6.6L V8	RWD	44.5	43.4
HD 3500 Crew Cab SLE	6.6L V8	4WD	44.5	43.4
HD 3500 Crew Cab SLT	6.6L V8	RWD	44.5	43.4
HD 3500 Crew Cab SLT	6.6L V8	4WD	44.5	43.4
HD 3500 Extended Cab	6.6L V8	RWD	44.5	35.2
HD 3500 Extended Cab	6.6L V8	4WD	44.5	35.2
HD 3500 Extended Cab SLE	6.6L V8	RWD	44.5	35.2
HD 3500 Extended Cab SLE	6.6L V8	4WD	44.5	35.2
HD 3500 Regular Cab	6.6L V8	RWD	44.5
HD 3500 Regular Cab	6.6L V8	4WD	44.5
HD 3500 Regular Cab SLE	6.6L V8	RWD	44.5
HD 3500 Regular Cab SLE	6.6L V8	4WD	44.5

2021 GMC Sierra 3500

Legroom (Imp.)

Trim	Eng.	Drive train	1st Row Legroom (in)	2nd Row Legroom (in)
HD Crew Cab	6.6L V8	RWD	44	43
HD Crew Cab	6.6L V8	RWD	44	43
HD Crew Cab	6.6L V8	4WD	44	43
HD Crew Cab	6.6L V8	4WD	44	43
HD Crew Cab AT4	6.6L V8	4WD	44	43
HD Crew Cab AT4	6.6L V8	4WD	44	43
HD Crew Cab Denali	6.6L V8	4WD	44	43
HD Crew Cab Denali	6.6L V8	4WD	44	43
HD Crew Cab SLE	6.6L V8	RWD	44	43
HD Crew Cab SLE	6.6L V8	RWD	44	43
HD Crew Cab SLE	6.6L V8	4WD	44	43
HD Crew Cab SLE	6.6L V8	4WD	44	43
HD Crew Cab SLT	6.6L V8	RWD	44	43
HD Crew Cab SLT	6.6L V8	RWD	44	43
HD Crew Cab SLT	6.6L V8	4WD	44	43
HD Crew Cab SLT	6.6L V8	4WD	44	43
HD Extended Cab	6.6L V8	RWD	44	35
HD Extended Cab	6.6L V8	RWD	44	35
HD Extended Cab	6.6L V8	4WD	44	35
HD Extended Cab	6.6L V8	4WD	44	35
HD Extended Cab SLE	6.6L V8	RWD	44	35
HD Extended Cab SLE	6.6L V8	RWD	44	35
HD Extended Cab SLE	6.6L V8	4WD	44	35
HD Extended Cab SLE	6.6L V8	4WD	44	35
HD Regular Cab	6.6L V8	RWD	44
HD Regular Cab	6.6L V8	RWD	44
HD Regular Cab	6.6L V8	4WD	44
HD Regular Cab	6.6L V8	4WD	44
HD Regular Cab SLE	6.6L V8	RWD	44
HD Regular Cab SLE	6.6L V8	RWD	44
HD Regular Cab SLE	6.6L V8	4WD	44
HD Regular Cab SLE	6.6L V8	4WD	44

2020 GMC Sierra 3500

Legroom (Metric)

Trim	Eng.	Drive train	1st Row Legroom (cm)	2nd Row Legroom (cm)
HD 3500 Crew Cab 159" AT4	6.6L V8	4WD	113	110.2
HD 3500 Crew Cab 172" AT4	6.6L V8	4WD	113	110.2
HD 3500 Crew Cab 159"	6.6L V8	RWD	113	110.2
HD 3500 Crew Cab 172"	6.6L V8	RWD	113	110.2
HD 3500 Double Cab 162"	6.6L V8	RWD	113	89.4
HD 3500 Reg Cab 142"	6.6L V8	RWD	113
HD 3500 Crew Cab 159"	6.6L V8	4WD	113	110.2
HD 3500 Crew Cab 172"	6.6L V8	4WD	113	110.2
HD 3500 Double Cab 162"	6.6L V8	4WD	113	89.4
HD 3500 Reg Cab 142"	6.6L V8	4WD	113
HD 3500 Crew Cab 159" Denali	6.6L V8	4WD	113	110.2
HD 3500 Crew Cab 172" Denali	6.6L V8	4WD	113	110.2
HD 3500 Crew Cab 159" SLE	6.6L V8	RWD	113	110.2
HD 3500 Crew Cab 172" SLE	6.6L V8	RWD	113	110.2
HD 3500 Double Cab 162" SLE	6.6L V8	RWD	113	89.4
HD 3500 Reg Cab 142" SLE	6.6L V8	RWD	113
HD 3500 Crew Cab 159" SLE	6.6L V8	4WD	113	110.2
HD 3500 Crew Cab 172" SLE	6.6L V8	4WD	113	110.2
HD 3500 Double Cab 162" SLE	6.6L V8	4WD	113	89.4
HD 3500 Reg Cab 142" SLE	6.6L V8	4WD	113
HD 3500 Crew Cab 159" SLT	6.6L V8	RWD	113	110.2
HD 3500 Crew Cab 172" SLT	6.6L V8	RWD	113	110.2
HD 3500 Crew Cab 159" SLT	6.6L V8	4WD	113	110.2
HD 3500 Crew Cab 172" SLT	6.6L V8	4WD	113	110.2
HD 3500 Crew Cab	6.6L V8	RWD	113	110.2
HD 3500 Crew Cab	6.6L V8	4WD	113	110.2
HD 3500 Crew Cab AT4	6.6L V8	4WD	113	110.2
HD 3500 Crew Cab Denali	6.6L V8	4WD	113	110.2
HD 3500 Crew Cab SLE	6.6L V8	RWD	113	110.2
HD 3500 Crew Cab SLE	6.6L V8	4WD	113	110.2
HD 3500 Crew Cab SLT	6.6L V8	RWD	113	110.2
HD 3500 Crew Cab SLT	6.6L V8	4WD	113	110.2
HD 3500 Extended Cab	6.6L V8	RWD	113	89.4
HD 3500 Extended Cab	6.6L V8	4WD	113	89.4
HD 3500 Extended Cab SLE	6.6L V8	RWD	113	89.4
HD 3500 Extended Cab SLE	6.6L V8	4WD	113	89.4
HD 3500 Regular Cab	6.6L V8	RWD	113
HD 3500 Regular Cab	6.6L V8	4WD	113
HD 3500 Regular Cab SLE	6.6L V8	RWD	113
HD 3500 Regular Cab SLE	6.6L V8	4WD	113

2021 GMC Sierra 3500

Legroom (Metric)

Trim	Eng.	Drive train	1st Row Legroom (cm)	2nd Row Legroom (cm)
HD Crew Cab	6.6L V8	RWD	111	109
HD Crew Cab	6.6L V8	RWD	111	109
HD Crew Cab	6.6L V8	4WD	111	109
HD Crew Cab	6.6L V8	4WD	111	109
HD Crew Cab AT4	6.6L V8	4WD	111	109
HD Crew Cab AT4	6.6L V8	4WD	111	109
HD Crew Cab Denali	6.6L V8	4WD	111	109
HD Crew Cab Denali	6.6L V8	4WD	111	109
HD Crew Cab SLE	6.6L V8	RWD	111	109
HD Crew Cab SLE	6.6L V8	RWD	111	109
HD Crew Cab SLE	6.6L V8	4WD	111	109
HD Crew Cab SLE	6.6L V8	4WD	111	109
HD Crew Cab SLT	6.6L V8	RWD	111	109
HD Crew Cab SLT	6.6L V8	RWD	111	109
HD Crew Cab SLT	6.6L V8	4WD	111	109
HD Crew Cab SLT	6.6L V8	4WD	111	109
HD Extended Cab	6.6L V8	RWD	111	88
HD Extended Cab	6.6L V8	RWD	111	88
HD Extended Cab	6.6L V8	4WD	111	88
HD Extended Cab	6.6L V8	4WD	111	88
HD Extended Cab SLE	6.6L V8	RWD	111	88
HD Extended Cab SLE	6.6L V8	RWD	111	88
HD Extended Cab SLE	6.6L V8	4WD	111	88
HD Extended Cab SLE	6.6L V8	4WD	111	88
HD Regular Cab	6.6L V8	RWD	111
HD Regular Cab	6.6L V8	RWD	111
HD Regular Cab	6.6L V8	4WD	111
HD Regular Cab	6.6L V8	4WD	111
HD Regular Cab SLE	6.6L V8	RWD	111
HD Regular Cab SLE	6.6L V8	RWD	111
HD Regular Cab SLE	6.6L V8	4WD	111
HD Regular Cab SLE	6.6L V8	4WD	111