I had no luck on the drive train forum so I'm gonna try this one.

Got my trans rebuilt 2 months ago with Suncoast parts everything except billet intermediate and output. Have had no leaks until I let her sit for 4 days then I noticed 2 wet spots under truck and the pan was soaked.
Found out the fluid is coming from the 8 pin connector and the shift shaft seal. Could it be a stuck check ball ? Or bad seals in the 2 items above. ? Thanks for the help.. I'm also in the process of ordering the fluidyne enduro cooler to keep temps in check during the summer and to by pass all the stock system.

 

I would take it back to builder

 

Gonna go back next week when I talked to him he said he is 99% sure it's a stuck check ball! but I've read on here of people removing them but havnt read anything about drain back and leaks after removing. I think I'm gonna stick to my original plan and just instal the fluidyne enduro cooler and go from there.