I did a 4l80e swap and noticed that the electrical connector going into the side of the trans is leaking fluid. I pushed it in more hoping that would help but it didn't. Anybody have an idea as to how to get it to stop leaking? It's not bad... but its a leak.

 

I think you would need to drop the pan and replace the green O-ring. Might be a good Idea just to replace the whole harness, pretty sure they are less than 50 bucks