Reading some of the post I was reading issues regarding transfer cases. On one of my fishing trips, I was on on a steep boat ramp to pull the boat out. I usually put the parking break on and put in gear since the break won't hold the jeep on any boat ramp no less this one. It always works but this time the jeep moved back about 3 to 4 inches and stopped , few seconds later did the same thing. Is it just crappy break or transmission problem. No problems during driving in 2wd or 4 wd