Have a 4L80E, dual fed the directs, .500 boost valve. I recently rebuilt it and its been shifting fine. All new solenoids and pressure solenoid. I had a pressure gauge that failed, was always reading belows 50psi. My new gauge appears to be reading accurate.

Idle in gear is 100psi, WOT it will hit 350-400psi in all gears. What should I be looking at to fix it, I know WOT it should be around 200psi (think thats what I read).

 

So found out my gauge was bad. I put a analog gauge on and found pressures to be good and within specs. The boost valve I'm running is a transgo , how does it differ from a sonnax, which provides more pressure?