Interesting...I wouldn't have figured the lubricant would have anything to do with how the gears work. Then again...I can barely explain how a Torsen works.
It has to do with how the diff locks up. Look for another article explaining its installation and theory of operation in the upcoming weeks.
Since I seem to be pretty much copying your mod list, about how much is installation going to cost us?
I was quoted 3 hours for just the posi unit. (It's more than that if you're swapping gears; mine are staying stock.) You also have to replace the bearings while you're in there. The bearings run about $40.
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