Paragon Transmission Problem

Ok group-- we need some help.

We've just put our Roamer back in the water. The new engine runs great, even after we had all our fuel stolen!

Anyways, long story short, we also put on a new 'used' tranny. The tranny we bought looked new inside. We have good pressure, it shifts into reverse, but no forward.

Originally, we had to take the pressure valve off the old tranny as the new tranny's was stuck. Once we did that, we had good pressure.

We've run out of options and are going to call in some very expensive people to take a look. Any ideas or help before I pick the phone up?

The model is HJ7C25-L.