I've seen Vaanth's thermoquad guide floating around the internet for 15 years now. The page says it was written by Gary Lewallen in 1998. That was 20 years ago! He also has a page in the moparts tech archive from the old mopar mailing list on the 8.75 diff. Gary assembled a wealth of knowledge for us years ago when all that was available had to still be dug out of books, magazines and catalogs. If Gary is still alive it would be fun to hear from him and hear about his history with the hobby.