Well, first, I'm going to do all the things I said I was going to do to see if that fixes it. If none of that works, I'll take it to Ross. If he finds that it's something that he's done to cause the issue, he'll do the repair for free. Thanks for the alternative name though. Never heard of him.
Not that it means anything, but I have. I was told to look him up years ago for a truck, tranny, and then I visited with him for info on rebuilding the mav trans with a stall. Nice guy, seemed to know what he was talking about. Never actually had work done by him, though...Good information was taken and used as I did my own work.
Joe builds all of our transmissions. From C4's to our Ultimate Glides in the big block cars. Great guy to do business with. Keep me posted on what happens with your C4. I'm curious now. I've never seen a C4 creep. Seen a couple of C6's and quite a few 4R70W's do it though.