Welcome to Justanswer ! my name is XXXXX XXXXX i will do my best to assist you with this problem
so what speed will it do this ?
when this happens the truck will not move at all ?
sorry for all the questions but I want to be sure to give you the correct answer
Speed seems to have no bearing on this happening , I had a front ring and pinon gear go bad about 3 months ago, and the hummer would not move even though the the rear axle is fine . This morning I had a u joint on the front axle break and the hummer will not move untill you unplug the Battery and let it reset. it will pull fine on the rear, but for only about 3 - 4 minutes . It is full timeXXXXX. is there anyway to bypass this and just use the rear axle to drive it back home . I was going about 45. mph when the u joint broke .
with the full time 4X4 there is no way to just run the rear axle
the only way is to install a selectable transfer case
and just keep it in 2WD im sorry to say