Hi, I'm new to the forum and have searched but I can't find a similar problem to the one I'm having. I only have 100k on the odo and the 96 XJ with 31s has never been towed with. I can only drive for about 30 minutes and then my tranny starts to slip, when I come to a stop, then accelerate it slips bad and will hardly move. I have to shift into 1st gear to get it moving again and then manually shift it to get it up to highway speeds. I can also feel it slip between 3rd and OD, it drops into 3rd too easily and doesn't hold OD as it should. I've already changed my filter and fluid, which made my shifts smoother. The new fluid is kind of burnt and looks more like motor oil light brown, not red. When I'm stopped and apply the brakes and the gas at the same time the jeep just slips, forward and reverse both. The only gear that still has some power is 1st. When I allow it to cool overnight it's fine again and drives and shifts smoothly. Could I have an overheating issue or worse? No check engine lights so I'm guessing there isn't any codes to read. Sorry for the long post.