I did it on lil Suzi when I lived in Memphis, It worked great going straight but was hard to turn. I switched over to a lockright in a Samurai carrier, much better. I see that trailtough has a limited slip for the sidekick front for a reasonable price that would work as well. If you are on a severe budget you can tri a poor mans possi by adding extra washers, I think their called thrust washers, to preload the spider gears so they don't turn easily.
Dave