904 just gave up

So when I put the tranny pan back on should I fill the pan first or start it then fill it slowly.
my converter is aftermarket 2500 stall and new, but could be the problem or my gear vendor and have no idea how to check it out till monday and call them.
I think you could put in a qt or two, then start it and add the rest at a reasonable pace. it's not a race, hahaha.