Stacy:
The lift height of 6" will vary a little depending on torsion bar adjustment-also you are only adding one inch with 37's as said here--measure your H2 now--add 6" and you will be close.
As Phil said, you need some margin too---7-10 or 8' is good.
Maesure your garage door height before you drive it home! I have seen a few people lose some stuff on the top of their Hummer--like crossbars.
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