A-904 shift kit

well your right on he Teflon seals. I replace them all the time in 6l80/90 gm transmissions for harsh delayed gear engagement. the wear out, I am an experienced builder, GM, but never a Chrysler transmission before. that is why I'm putting the feelers out there. this is my car, not a customers, I want to make sure all the goodie tricks/etc I can do while out and apart the better for me and my car. don't want to do it again, as it is I have to remove the a998/a999 lock up that is in there, because is does not engage gears till I rev it up. bought from a guy I knew that (claims also has shift kit) I think it has been done wrong, or something ripping it out, shafts WAY to early, also has a 5-1 ratio in it now/ the new trans A904 will be 4.2-1, built by me and my choices. want is to hold gears longer. and shift solid.