i just pulled the 12 bolt out of my K5. it has 3.42's ( /forums/images/graemlins/frown.gif) and maybe a LSD? it does have the conventional spider gears but there are also some sort of worm type gears behind that that rides against a couple of levers with springs. it may not be a LSD, but its not like the typical open im used to seeing. $75 obo. i also have the 10 bolt front whole or parts.