hello everyone, i am the proud owner of a highly modified 89 xj. among other things 7in of lift, 33s, and numerous add ons. OK, now for my problem, recently myxj will not "stay in reverse. all forward gears shift smoothly, but i put it in reverse, goes fine forlke 10 feet, and then it slams stopped like it is being thrown in park. you can rev all day while in reverse, nothing, acts like neutral. put it back in drive, goes fine, back in reverse, another 10 ft, then boom same thing, what im wondering, could this be transfer case? or tranny? any help would be greatly appreciated.