I wish this were my problem, but I don't think it is. I recall paying careful attention to the cup (I think it's on the 3650 where the cup is supposed to stay on the shifter and on the T-45 it's supposed to stay in the trannie - not sure exactly why that is, but that is what I recall from when we did the install) The old shifter was the Blue Thunder and, because of the sloppiness, I just assumed it was a POS, so we replaced it the Tri-Ax...same problem still exists. Is it possible that the cup is damaged? As I said before, I'll be removing it this weekend and inspecting it...but something is wrong. My gut feeling is that the trannie is trashed, but it otherwise works fine (except for being a PITA to get into rev and often popping out of rev).