I have had my 1988 YJ for 3 months it has had no problems. I haven't driven it for a week. I got in it to drive it, it started right up but i put it into gear and nothing. I can also push the jeep while its in gear. Its a 5 speed. The transfer case it not in neutral. It is not leaking fluid. Any ideas? I let it run for a while to warm up, that didn't help.