I've been trying to figure this out for the past month with no explanation! I have a 2002 zr2 blazer with the nv236 tcase (4 button). The front vaccum/diff is engaging properly like it should. The 4x4 buttons are all working and the tcase is making a clunk and engaging. With that being said I held the brake and was able to spin the back tires in 4low but didnt do anything up front. So I put the truck up on jack stand and all 4 wheels spun! BUT when its back on the ground the front wheels again do not. I then raised the back wheels off the ground, locked in 4x4 low gear and attempted to pull the truck forward using the front wheels.. No luck, the front driveshaft doesn't turn at all while the back are spinning normally.. It seems like its trying to but just doesn't have enough power going to the front driveshaft, like maybe something is slipping or not fully engaged inside the tcase?? But is making no weird noises. If anybody could be of any help I would greatly appreciate it. My research has led me nowhere..

 

*Thread Closed* - Duplicate thread. Those wishing to respond can do so in the original thread on this topic - Zr2 transfer case slipping?