UPDATE: **SOLD** Was on eBay.
Dan spotted this. I’d never heard of it. I found the history of it here. Apparently they were designed for racing, hot rods, and muscle cars. Hone-O-drive is once again making these.
“Under drive over drive transmission Assm new never been installed. Sat under my neighbors shelve in his garage for 20 years he was going to install it in a jeep I believe but his wife wasn’t sure ..I really do not know much about it except it is still like new unused …well I just sold my old willys so it is up for sale. It turns very easily and smoothly and has never had oil in it or installed in a vehicle Hope someone can use it”
I was looking for something like this, unfortunately it’s 2 years after your post. My email is not capitals