I air checked the clutch pack set up before I installed it in the case and I also checked it once the transmission was put back together minus the valve body and I heard an audible thunk both times with very very minimal air escaping and I was that 35 psi. I'll tear down the valve body in a bit, and see if I can find the culprit. I don't know if it's of any relevance but the 904 valve body did not have part throttle kickdown like the other 727 valve body