Rebuilt A998 - No upshift/only 1st gear

If the pump is "NEW", and in spec,then the low pressure points back to the VB and the mixing up of springs.
Waitaminute, that's not right. In reverse the pump runs wide open. At 150 your pressure is some 30% down.
Hmmmmmmmmmmmmmmmmmmm
Ok I checked my 69 fsm. There is a high-pressure relief system. I believe it has a 3/8 checkball . If someone accidently installed a 5/16 ball there,(as all the other balls are)it could effectively show up as a leak, and ensuing low pressure.If you do find a small ball there, I guess you would have to search for where the bigger ball is.

I reviewed post #9, the pressure post, and I did not see a report on governor pressure. So if gov pressure is not reaching the shift valves, there can be no shifts, with the selector lever in Drive. And with the TF-II, you still cannot have manual-second until gov pressure climbs to line-pressure.
So I guess I would be chasing that circuit down.If you did report on gov pressure and it fell in spec,but I missed it, then I would be chasing the 1-2 shift valve and it's associated spring.
FWIW: if the accumulator piston or bore was cracked, the band apply pressure could all leak away before it ever got to the KD servo.