I totally did the same, different fluids to try to minimize it, including mixing the Lucas stop grind stuff in which helped a small amount, but not much. Eventually got down to slow baby shifting on track and then I found another used transmission. Then noticed just how loud and notchy my old one had gotten since you slowly just get used to it Sucks looking back at my PB at Heartland, right before it shut down and wondering how much time I was giving up on those shifts! Now I shall never know