I have a 2017 L5P and rebuilt the transmission with a stage 3 suncoast kit this summer. Haven’t had any issues for 6k miles and all of the sudden I’m getting hard downshifts from 4-3-2-1 and my 5-4 downshift has produced a howl. None of this is consistent though. Changed the spin on filter to see if maybe I had any metal on the magnet but just some break in material. So from there I drained my trans (oil was still very clean and not burnt, no metal material in pan) and threw in a new internal filter in hopes of getting rid of the issue and just to appease myself but the issue persists. No codes or anything so I’m just curious to hear if any of you Allison gurus have some insight and guidance on where to start or what to look for.