Hi, one of my parts trucks has these rears in it. I don't know if it's a posi, or limited slip or whatever. someone please help identify? i don't know much about rears. I spin the wheel, and they both go forward.... Front: http://www.atvguards.com/ebay/80blazer/front.jpg Rear: http://www.atvguards.com/ebay/80blazer/rear.jpg I have more pictures if you need more. These also have richmond gears, from what I gather 3:73 -- the rear diff cover looks like it had some gears shot into it, so i'm guessing the PO replaced both sets.