I found a good reference document that I am still reading up on. It contains a list of all the Borg Warner (Morse) chains made for production vehicles (including the 7/16 pitch GMR chain). These include trans and transfer case chains.
For a 3/8 pitch chain, we need 84 pitches to make it work. Gears (sprockets) are another story of course....
http://www.rsgear.com/catalogs/borgwarnercat-2007.pdf
P/N for the 3/8" GMR chain in here
http://www.amtrans.nl/4T60E-_4T65E.pdf
If anyone has any sources/contacts with borg warner/morse (internally) [slim chance but doesn't hurt to ask] maybe some more info can be brought into the picture.
