Specifications Comparison: 2009 Hummer H3 vs 2008 Hummer H3

Headroom

Trim	Eng.	Drive train	1st Row Headroom (in)	2nd Row Headroom (in)
	3.7L	4WD	40.7	39.8
Adventure	3.7L	4WD	40.7	39.8
Alpha	5.3L V8	4WD	40.7	39.8
Alpha H3X	5.3L V8	4WD	40.7	39.8
H3X	3.7L	4WD	40.7	39.8
Luxury	3.7L	4WD	40.7	39.8
Crew Cab	3.7L	4WD	40.7	39.5
Crew Cab Adventure	3.7L	4WD	40.7	39.5
Crew Cab Luxury	3.7L	4WD	40.7	39.5
Crew Cab Alpha	5.3L V8	4WD	40.7	39.5

Trim	Eng.	Drive train	1st Row Headroom (in)	2nd Row Headroom (in)
	3.7L	4WD	40.7	39.8
Adventure	3.7L	4WD	40.7	39.8
Alpha	5.3L V8	4WD	40.7	39.8
Alpha H3X	5.3L V8	4WD	40.7	39.8
H3X	3.7L	4WD	40.7	39.8
Luxury	3.7L	4WD	40.7	39.8

Trim	Eng.	Drive train	1st Row Headroom (cm)	2nd Row Headroom (cm)
	3.7L	4WD	103.4	101.1
Adventure	3.7L	4WD	103.4	101.1
Alpha	5.3L V8	4WD	103.4	101.1
Alpha H3X	5.3L V8	4WD	103.4	101.1
H3X	3.7L	4WD	103.4	101.1
Luxury	3.7L	4WD	103.4	101.1
Crew Cab	3.7L	4WD	103.4	100.3
Crew Cab Adventure	3.7L	4WD	103.4	100.3
Crew Cab Luxury	3.7L	4WD	103.4	100.3
Crew Cab Alpha	5.3L V8	4WD	103.4	100.3