I've had it with this 904, about to give up!

Glad you found it Mplex. When you assemble the pump it needs to be aligned good. I went to NAPA and bought 2 of the biggest hose clamps they had and put them together to make one huge clamp that wraps completely around the pump to hold it in alignment while tightening down the bolts.

BTW: to answer your question in post # 33 "does the air pressure test tell you anything about the pump stator seals", yes it does. When everything is assembled and you inject air into the case for each clutch port it travels through the stator to the clutch packs so if the stator sealing rings aren't sealing you should be able to hear it. I think it was mentioned earlier but in case it wasn't you will hear some air leaking out cause air doesn't seal up real good. As long as it's just a little air leakage your ok. In your test video everything sounded normal to me.