It drives fine part throttle, it's only when stomping it the shifts are getting lazy. I'm sure when we first got it it shifted much nicer into 2nd so it's probably in need of some loving. I'd rather not kill this box like I did with the VS that would slip big time when you got up it

Just having a dig through the garage. I have a TCI Trans Scat shift kit http://www.jegs.com/i/TCI/890/376002/10002/-1 as well as the TCI corvette style 2nd gear servo http://www.jegs.com/i/TCI/890/376003/10002/-1 so would just need to get a boost valve. I actually bought these for the old VS but never fitted em as the trans was past saving.
My mate recently put a transgo shift kit in his car and we had to reduce the low TPS line pressures as it was banging into gear real hard.