While i see a popular thread on posi rears, i just thought id bering this up. I was at a junk yard the other day and saw a thirdgen z28 with a Drum/Drum rear in it. Could it be a posi? and if so, what gears would be in it? If its a good rear, should i buy it for $25?

 

yes it could be posi and any gear set could be in it. you can pull the cover and look and you'd know for sure

 

They shouldn't have any arguments about you pulling the cover, either. TIP: Bring an empty jug of antifreeze with you, and a blade knife. Lay the antifreeze bottle on it's side, flat on the ground. Use the knife to cut a big circle in the top- voila, instant "low profile" drain pain to slide under the diff cover. Make sure you keep the cap on the antifreeze bottle so the fluid doesn't leak out. That way you're not lying in that stank gross fluid. (Makes me wanna yack every time I smell it...)