A friend of mine has a 86 YJ, we recently installed a rusty's 4" lift with a t-case drop. We haven't got around to installing an SYE in it. But when he drives it pops out of reverse only. I did pull off the center console and cut away the metal where the stick would hit to fix the problem. It solved it for a few weeks and then started doing it again, so we pulled off the console again...its not hitting, but it still pops out of reverse after driving about 10 feet. I can't think of anything else..I don't think its the driveshaft because wouldn't that do it in any gear?..not just reverse.