Stop in for a cup of coffee

Mopar Tim said

Trans failed. Replaced with new rebuild. Used original cheetah valvebody. It was new. Failed trans less then 400 miles on it. Bought new PTC Converter. Got it put back together seemed ok. Shifted fine
Now next day soft shifts and no movement after sitting a little while. Put in neutral for a minute trans will move. But still not as strong a 1 2 shift. Valve body was disassembled to clean.

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So that's the history, but I don't see the relationship.
AFAIK the pressure comes from the pump and the adjustment is made with the screw on the side of the valve body.
The pressure is checked with a gage on the port. The catch is that the engine has to be in drive and the wheels turning slowly - therefore a lift.
If it the pressure is too low or high, to access the adjuster the pan is dropped, and maybe the filter too.