The final drive gear ratios, front and rear axle, for the Hummer H3 full time 4WD is 4:56 to one. The 1st gear ratio with the transfer case engaged in low range is 2:64:1 which yields a crawl ratio of 45.1:1. The Hummer H3 can really crawl over rocks and boulders with that awesome low range gearing.
Even so, with a few relatively simple modifications, it still manages about 23-24 on the highway with the cruise control set for 65 mph. The engine turns at about 2500 rpm at that speed in 5th gear.
In high range, of course!!!