I have been able to spend some time driving around in the YJ lately and I am noticing some whining in the AX15 but only in 5th gear. Its not loud ...just a little annoying. I drained out what looked like basically oil not dirty but slightly discolored. I replaced it with 10w30 synthetic and I am still noticing the whine. The transmission shifts just fine. Not sure what to think, where do I go from here?