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May 27, 2009 - I was a little surprised when I saw the differential.
Using the classic "turn one wheel and see which way the other one goes" test would indicate this is an open diff. But there's some extra machinery here and what looks suspiciously like a clutch pack. The upper doodad spins when I turn one wheel, and it's spring-loaded and can open up. High rates of spin might lock up the rear or at least bring the clutches into play. At least, that's my theory right now. Interesting little thing though!
tags: suspension, rear axle