ok, i have an 89 wrangler 4.2 all stock except it has 33" super swampers on it. lift has not yet been installed, will be installed in spring. But i have been having issues with my 4wd. at first when i almost got stuck off roading i thaught that it wasnt working at all, so i figured it was a vac line, but it wasnt. i put it up on jack stands and both front wheels were spinning when i put it in 4wd? so then i went off roading again and went to flex on a rock and my front wheels wouldnt spin so i couldnt get on it then i got stuck on an un even bump (rear differential is not locked so only one wheel spins) then almost got stuck again. so i got home put it up on jack stands to check it out and 4wd... worked fine? when i was in the trail and when ever i put it in 4wd weather it works or not the gears always get really low like they should when it is in 4wd low. so it seems like it is working and the 4wd light always comes on but when eveer i actually try to use the 4wd in the trail the front wheels dont move. but when i put it on jack stands and their is no pressure or any resistance it works fine. What is going on with my 4wd? when ever i need it it doesnt work? WTF?????