[chcknugget]

Hello,
I've read that 4wd should not be used on dry pavement, why is this? Also, why can't you use it at highway speeds?

Anyways, recently I started my car up and right away something was rubbing like a tire against the frame but it was the front diff grinding at slow speeds. It stopped in 4wd. the nasty grinding is gone, but now it seems there is always a little grinding in 2wd until i push the buttons back and forth enough to totally switch out. Also, now my jimmy turns perfect in 4wd and doesn't bind nearly as much, but it might not completely be in 4wd.

This leads me to believe the front dif is partially engaged. What is the fix for this? Check the vacuum lines somewhere?