The chatter that you described is the lockout slipping in and out in the TC. It will get worse in time and chatter so bad you'll swear the dash is going to fall out. I'd get it in and checked out to be sure it's not a bad shift silonoid, but my money's on the TC it's self. There is a good chance you can get by with just a new TC since it has just started messing up on ya.

John Luttrell
2001 4x4 short cab, 3 inch lift with 33 inch mudders and Powertrax no-slip in the rear


1991 Jeep YJ, 4 inch suspension lift on 33" BFG's