The stock pan is the same design as the 727, just deeper. So when I put a double deep Mag-Hytec pan on the 47RE, I saved the old pan to put on one of my other mopar projects with a 727.
Install is very easy, just wipe the edge and use either gasket. Keep things clean. I used my old one. And I installed the trans temp probe, even though I don't have it hooked up to the gauge yet. Hope this helps.
TP