Specifications Comparison: 2006 GMC Sierra 2500 vs 2020 GMC Sierra 2500

Headroom

2006 GMC Sierra 2500

Headroom (Imp.)

Trim	Eng.	Drive train	1st Row Headroom (in)	2nd Row Headroom (in)
HD 2500 Crew Cab SL	V8	RWD	41	39
HD 2500 Crew Cab SL	V8	4WD	41	39
HD 2500 Crew Cab SLE	V8	RWD	41	39
HD 2500 Crew Cab SLE	V8	4WD	41	39
HD 2500 Crew Cab SLT	V8	RWD	41	39
HD 2500 Crew Cab SLT	V8	4WD	41	39
HD 2500 Extended Cab SL	V8	RWD	41	38.4
HD 2500 Extended Cab SL	V8	4WD	41	38.4
HD 2500 Extended Cab SLE	V8	RWD	41	38.4
HD 2500 Extended Cab SLE	V8	4WD	41	38.4
HD 2500 Extended Cab SLT	V8	RWD	41	38.4
HD 2500 Extended Cab SLT	V8	4WD	41	38.4
HD 2500 Regular Cab SL	V8	RWD	41
HD 2500 Regular Cab SL	V8	4WD	41
HD 2500 Regular Cab SLE	V8	RWD	41
HD 2500 Regular Cab SLE	V8	4WD	41

2020 GMC Sierra 2500

Headroom (Imp.)

Trim	Eng.	Drive train	1st Row Headroom (in)	2nd Row Headroom (in)
HD 2500 Crew Cab 159" AT4	6.6L V8	4WD	43	39.9
HD 2500 Crew Cab 172" AT4	6.6L V8	4WD	43	39.9
HD 2500 Crew Cab 159"	6.6L V8	RWD	43	39.9
HD 2500 Crew Cab 172"	6.6L V8	RWD	43	39.9
HD 2500 Double Cab 149"	6.6L V8	RWD	43	39.9
HD 2500 Double Cab 162"	6.6L V8	RWD	43	39.9
HD 2500 Reg Cab 142"	6.6L V8	RWD	43.1
HD 2500 Crew Cab 159"	6.6L V8	4WD	43	39.9
HD 2500 Crew Cab 172"	6.6L V8	4WD	43	39.9
HD 2500 Double Cab 149"	6.6L V8	4WD	43	39.9
HD 2500 Double Cab 162"	6.6L V8	4WD	43	39.9
HD 2500 Reg Cab 142"	6.6L V8	4WD	43.1
HD 2500 Crew Cab 159" Denali	6.6L V8	4WD	43	39.9
HD 2500 Crew Cab 172" Denali	6.6L V8	4WD	43	39.9
HD 2500 Crew Cab 159" SLE	6.6L V8	RWD	43	39.9
HD 2500 Crew Cab 172" SLE	6.6L V8	RWD	43	39.9
HD 2500 Double Cab 149" SLE	6.6L V8	RWD	43	39.9
HD 2500 Double Cab 162" SLE	6.6L V8	RWD	43	39.9
HD 2500 Reg Cab 142" SLE	6.6L V8	RWD	43.1
HD 2500 Crew Cab 159" SLE	6.6L V8	4WD	43	39.9
HD 2500 Crew Cab 172" SLE	6.6L V8	4WD	43	39.9
HD 2500 Double Cab 149" SLE	6.6L V8	4WD	43	39.9
HD 2500 Double Cab 162" SLE	6.6L V8	4WD	43	39.9
HD 2500 Reg Cab 142" SLE	6.6L V8	4WD	43.1
HD 2500 Crew Cab 159" SLT	6.6L V8	RWD	43	39.9
HD 2500 Crew Cab 172" SLT	6.6L V8	RWD	43	39.9
HD 2500 Double Cab 149" SLT	6.6L V8	RWD	43	39.9
HD 2500 Double Cab 162" SLT	6.6L V8	RWD	43	39.9
HD 2500 Crew Cab 159" SLT	6.6L V8	4WD	43	39.9
HD 2500 Crew Cab 172" SLT	6.6L V8	4WD	43	39.9
HD 2500 Double Cab 149" SLT	6.6L V8	4WD	43	39.9
HD 2500 Double Cab 162" SLT	6.6L V8	4WD	43	39.9
HD 2500 Crew Cab	6.6L V8	RWD	43	39.9
HD 2500 Crew Cab	6.6L V8	4WD	43	39.9
HD 2500 Crew Cab AT4	6.6L V8	4WD	43	39.9
HD 2500 Crew Cab Denali	6.6L V8	4WD	43	39.9
HD 2500 Crew Cab SLE	6.6L V8	RWD	43	39.9
HD 2500 Crew Cab SLE	6.6L V8	4WD	43	39.9
HD 2500 Crew Cab SLT	6.6L V8	RWD	43	39.9
HD 2500 Crew Cab SLT	6.6L V8	4WD	43	39.9
HD 2500 Extended Cab	6.6L V8	RWD	43	39.9
HD 2500 Extended Cab	6.6L V8	4WD	43	39.9
HD 2500 Extended Cab SLE	6.6L V8	RWD	43	39.9
HD 2500 Extended Cab SLE	6.6L V8	4WD	43	39.9
HD 2500 Extended Cab SLT	6.6L V8	RWD	43	39.9
HD 2500 Extended Cab SLT	6.6L V8	4WD	43	39.9
HD 2500 Regular Cab	6.6L V8	RWD	43.1
HD 2500 Regular Cab	6.6L V8	4WD	43.1
HD 2500 Regular Cab SLE	6.6L V8	RWD	43.1
HD 2500 Regular Cab SLE	6.6L V8	4WD	43.1

2006 GMC Sierra 2500

Headroom (Metric)

Trim	Eng.	Drive train	1st Row Headroom (cm)	2nd Row Headroom (cm)
HD 2500 Crew Cab SL	V8	RWD	104.1	99.1
HD 2500 Crew Cab SL	V8	4WD	104.1	99.1
HD 2500 Crew Cab SLE	V8	RWD	104.1	99.1
HD 2500 Crew Cab SLE	V8	4WD	104.1	99.1
HD 2500 Crew Cab SLT	V8	RWD	104.1	99.1
HD 2500 Crew Cab SLT	V8	4WD	104.1	99.1
HD 2500 Extended Cab SL	V8	RWD	104.1	97.5
HD 2500 Extended Cab SL	V8	4WD	104.1	97.5
HD 2500 Extended Cab SLE	V8	RWD	104.1	97.5
HD 2500 Extended Cab SLE	V8	4WD	104.1	97.5
HD 2500 Extended Cab SLT	V8	RWD	104.1	97.5
HD 2500 Extended Cab SLT	V8	4WD	104.1	97.5
HD 2500 Regular Cab SL	V8	RWD	104.1
HD 2500 Regular Cab SL	V8	4WD	104.1
HD 2500 Regular Cab SLE	V8	RWD	104.1
HD 2500 Regular Cab SLE	V8	4WD	104.1

2006 GMC Sierra 2500

Headroom (Metric)

Trim	Eng.	Drive train	1st Row Headroom (cm)	2nd Row Headroom (cm)
HD 2500 Crew Cab 159" AT4	6.6L V8	4WD	109.2	101.3
HD 2500 Crew Cab 172" AT4	6.6L V8	4WD	109.2	101.3
HD 2500 Crew Cab 159"	6.6L V8	RWD	109.2	101.3
HD 2500 Crew Cab 172"	6.6L V8	RWD	109.2	101.3
HD 2500 Double Cab 149"	6.6L V8	RWD	109.2	101.3
HD 2500 Double Cab 162"	6.6L V8	RWD	109.2	101.3
HD 2500 Reg Cab 142"	6.6L V8	RWD	109.5
HD 2500 Crew Cab 159"	6.6L V8	4WD	109.2	101.3
HD 2500 Crew Cab 172"	6.6L V8	4WD	109.2	101.3
HD 2500 Double Cab 149"	6.6L V8	4WD	109.2	101.3
HD 2500 Double Cab 162"	6.6L V8	4WD	109.2	101.3
HD 2500 Reg Cab 142"	6.6L V8	4WD	109.5
HD 2500 Crew Cab 159" Denali	6.6L V8	4WD	109.2	101.3
HD 2500 Crew Cab 172" Denali	6.6L V8	4WD	109.2	101.3
HD 2500 Crew Cab 159" SLE	6.6L V8	RWD	109.2	101.3
HD 2500 Crew Cab 172" SLE	6.6L V8	RWD	109.2	101.3
HD 2500 Double Cab 149" SLE	6.6L V8	RWD	109.2	101.3
HD 2500 Double Cab 162" SLE	6.6L V8	RWD	109.2	101.3
HD 2500 Reg Cab 142" SLE	6.6L V8	RWD	109.5
HD 2500 Crew Cab 159" SLE	6.6L V8	4WD	109.2	101.3
HD 2500 Crew Cab 172" SLE	6.6L V8	4WD	109.2	101.3
HD 2500 Double Cab 149" SLE	6.6L V8	4WD	109.2	101.3
HD 2500 Double Cab 162" SLE	6.6L V8	4WD	109.2	101.3
HD 2500 Reg Cab 142" SLE	6.6L V8	4WD	109.5
HD 2500 Crew Cab 159" SLT	6.6L V8	RWD	109.2	101.3
HD 2500 Crew Cab 172" SLT	6.6L V8	RWD	109.2	101.3
HD 2500 Double Cab 149" SLT	6.6L V8	RWD	109.2	101.3
HD 2500 Double Cab 162" SLT	6.6L V8	RWD	109.2	101.3
HD 2500 Crew Cab 159" SLT	6.6L V8	4WD	109.2	101.3
HD 2500 Crew Cab 172" SLT	6.6L V8	4WD	109.2	101.3
HD 2500 Double Cab 149" SLT	6.6L V8	4WD	109.2	101.3
HD 2500 Double Cab 162" SLT	6.6L V8	4WD	109.2	101.3
HD 2500 Crew Cab	6.6L V8	RWD	109.2	101.3
HD 2500 Crew Cab	6.6L V8	4WD	109.2	101.3
HD 2500 Crew Cab AT4	6.6L V8	4WD	109.2	101.3
HD 2500 Crew Cab Denali	6.6L V8	4WD	109.2	101.3
HD 2500 Crew Cab SLE	6.6L V8	RWD	109.2	101.3
HD 2500 Crew Cab SLE	6.6L V8	4WD	109.2	101.3
HD 2500 Crew Cab SLT	6.6L V8	RWD	109.2	101.3
HD 2500 Crew Cab SLT	6.6L V8	4WD	109.2	101.3
HD 2500 Extended Cab	6.6L V8	RWD	109.2	101.3
HD 2500 Extended Cab	6.6L V8	4WD	109.2	101.3
HD 2500 Extended Cab SLE	6.6L V8	RWD	109.2	101.3
HD 2500 Extended Cab SLE	6.6L V8	4WD	109.2	101.3
HD 2500 Extended Cab SLT	6.6L V8	RWD	109.2	101.3
HD 2500 Extended Cab SLT	6.6L V8	4WD	109.2	101.3
HD 2500 Regular Cab	6.6L V8	RWD	109.5
HD 2500 Regular Cab	6.6L V8	4WD	109.5
HD 2500 Regular Cab SLE	6.6L V8	RWD	109.5
HD 2500 Regular Cab SLE	6.6L V8	4WD	109.5