I'm told it's a posi from the guy I bought the car from? I'll have to verify.
PM me , and I can give you my cell #, and we could talk about a fair price and shipping.
I have a 8.5 posi with 3.73 gears. I pulled the cover and verified what I'm saying already. I'm located in Connecticut . I also have the driveshaft which is 1" shorter as well. In working condition still in car