I saw no hummer page so I thought I would post it here.

With the autotrac (four wheel drive buttons) what is the very top button for?? (the round one)

Correct me if I am wrong, but the bottom one is 4lo with the t-case and the rear diff. locked, the one above that is 4lo with only the t-case locked, and the one above that is 4hi w/o anything locked. Is that correct??

All that money for a Hummer and no owners manual ?