My first rebuild attempt is not turning out as I had hoped. After a short drive it's got reverse and low gear only. After much research I bought a gauge to check pressures. I have the back wheels off the ground. In drive the governor pressure never gets to 20psi even when the engine speed is above 4000rpm. I checked the line, front and rear servo pressures. They all read 0, in every gear and any throttle lever position. I don't know why the car moved. I installed a Superior shift kit if that makes a difference. Also I did stand the trans up on the output shaft to get the TQ on. One post I read said this could cause an issue.

Can Moparts please help me understand what's happening?

Thanks