Damn dude, sorry to hear about all the little BS issues and especially the trans. I've heard thru the grapevine you like to use and abuse trannies.
Glad you did the build thread. Enjoyed every minute of it. You've done some great work. Very tasteful and classy.
My advise on the efans, don't ground to the core support. It will work but I've seen many issues with that, I've installed many plows on GM trucks and had to move that ground to the battery due to poor continuity. They worked for about a season and then lights wouldn't switch from truck to plow. It's not real metal, it's like pot metal.
It's always just a matter of time til the 4L60's give up the ghost. I just had same thing happen to mine. I'm shifting but blowing thru my convertor. I have to update my build. I've been stupid busy lately. Keep up the good work.