I had to take my transfer case apart to swap out the input shaft for the 4l80e. when putting it back together I was having problems getting that stupid snap ring around the rear bearing. the bearing wouldn't come far enough aft. anyways, finally got it together I could spin it with my hands so I figured it was good. I put it in the truck and it wont shift into 4wd. In 2hi it drives like it should. if I put it into 4Lo it is definitely in Lo gear but only the rear tires. I can get out and spin the front drive shaft with it in 4hi or 4Lo. Everything else seems to work like it should, the 4x4 light even comes on, but I can spin the front drive shaft. This is a manual shift transfer case. and I have checked the linkage and its fine. Any suggestions before I take this thing apart again??