first time i've ever had this happen.  but when i go into 4-hi and start driving off the faster i go the 4-wheel gear shifter hops around and then pops out of 4-hi.
then i tried it in 4-lo and it makes loud bumping noises.
is my transfer case finished?  my uncle said it may just need new gear oil.  either way it sucks just the same.
<edit>also i have auto locking hubs. and when i got my new tires a week or two back i declined the alignment...figuring i'd get mt lift kit by now. could my trackers 4-wheel drive be out of whack from lack of proper alignment?