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Old 08-11-2012, 09:19 PM
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There are many limited slip differentials that have springs in them. The most popular one is the Eaton Posi. I can't say for sure what yours is, but I believe it's an early version of the Eaton Posi. I have seen many pictures of those, but I have never had one in my shop. I have only seen them in '60s GM truck 12 bolt rear ends.
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