727 slipping

This just dawned on me. Let's suppose the cooler was packed full of crud from the last time the trans. burned up. You now put in a new trans. and the pressure forces all that crap into the new trans. and plugs up the filter so it can't pump anything. I'd drop the pan and have a look at things.

Also let there be a lesson learned here. Any time you pull out a burned up trans. flush the trans. cooler thoroughly.