Sorry...wasn't thinking. My axles don't use it and I forgot that some limited slips do.
Most of the time, you won't have any problems if you just use a gear oil that's recommended for use in limited slip axles. It will say that on the container. Sometimes, you might have to buy an additive, but don't do this up front...just change the oil and see what happens. If you start hearing a chirping from the rear, add a little bit to the pumpkin to quiet it.
If it's worth doing, then it's worth [I]over[/I]doing.
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The build, the gear, and the mileage: [URL="http://www.jeepforum.com/forum/f22/wasteland-survival-guide-engineering-greta-1344782/"][B]The Wasteland Survival Guide[/B][/URL]