Found this on ebay, asked seller about marking on case, said there were none? Comments? Doesn't look like any 8.5 factory carrier I've seen. http://www.ebay.com/itm/190714201677?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2648
looks like a "cone style" posi. I think Borg Warner made some that were OE in the Buicks at one time or another - early 70s anyhow I cant tell from looking if thats an 8.5 or not, but I know they existed.
