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I figured out how the rear diff works. It has a fluid pump that's always turning, and a clutch pack connecting the driveshaft. A difference in speed causes the fluid to go somewhere and engage the clutch. Thus, the fluid is ATF-like, but it has to be compatible with the clutch. Since it has that fluid pump, the clutch may not work if the diff is underfilled by any significant amount or if a different fluid with wrong friction modifiers is used, and the fluid is already pretty thin once sheared from use. I guess scrap that dumb idea then.
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