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There is a pressure relief valve to prevent the pump locking up and destroying itself. You will hear it working when you hold the steering hard on full lock. Otherwise the fluid is recycled back to the reservoir through the valves until you turn the wheel and that upsets the valves which close off until the wheel movement stops and no fluid is let in or released until the wheel is again moved.
check the throttle valve manual lever it passes through the manual shift lever on the trans they become corroded and stick causing what sounds like your problem
I have a 1999 Ram B 1500 Van, auto transmission, 5.9 L engine.
Same problem, trans hesitates in 2-3 upshift, sometimes 1-2
to 2-3 upshift. Posts trouble code P1756 - Transmission Govenor pressure too low at below 15 to 20 Psi. Transmission pump shot or valve body leak stops trans from reaching proper pressure to shift, which is minimum 15 Psi.
Either trans is leaking in valve body, valve is stuck, shift solenoid on valve body is sticking, or pump is shot.
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