Yes they used goop. They've been using goop for a very long time. We've been discussing FORD GREY the entire thread. GM used black as well as Chrysler. The RTV worked so well that you started seeing silicone one piece gaskets popping up FROM THE FACTORY. So yeah, they've been using it a while.
Tremec uses goop in between trans housings, T5s, T56s etc right? Like when I install shifter on a tremec do I use a gasket? Nope bead of goop bolt shifter down no leaks. If I don't ever want shifter to ever come off Right Stuff....