I don't get this thread.
How are you guys comparing 2k and 4k oil in a gear diff to be a similar action to a ball diff?! Ball differentials have quite a heavy action, so surely by putting such a light weight oil in your gear diff is the exact opposite?
The 12,500 weight the KF2 comes with gives it a nice heavy action - similar to a ball diff. To me, if you wanted to make it feel more like a ball differential I think maybe 15,000 would be good.
Ball diffs and gear diffs will always handle slightly different though as they operate in quite a different manor.
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