[Captkaos]

I personally would go with an Eaton Limited slip over the others listed.
The powertrax can be used with a open diff though, so if you find an open diff with the gears you like you can remove the spider gears and replace them with the powertrax parts and you are done. Auburn' by design tends to eat their housing when the get old and go out.

If you are going to keep the 10bolt, you can buy a limited slip, and gears with all the part for a complete overhaul for about $1000. $130 rebuild kit, r&P $350 posi $450, $250-350 setup out of the truck.