Hi Guys - I was wheeling a couple of weekend ago in my fj and was climbing a really steep hill on a loose, rocky dirt road. I stopped the fj and placed it into 4 low after I couldn't get traction anymore out of 4. I went for about 100 yards, stopped again and engaged the A Trac. After engaging the A Trac (waited for the idiot light to illuminate), I started forward again and the fj made the most horrendous grinding sound and seemed to have trouble moving forward. I disengaged the A Trac and engaged the rear locker instead and everything worked fine (no grinding noise and forward monmentum). Has anyone had this happen to them or heard about it happening? Any ideas on what happened? Thanks in advance!