I'm about to buy an eaton posi unit for my 10 bolt chevelle, but i dont know what install kit to use. There are two choices. One uses Intra-Lok carrier shims and the other uses standard. What is the difference between these two and is it necessary to buy the Intra-Lok setup? I have a mild 355 and am going to run 3.73's in back. It won't be a torque monster of any sort. Ken Chicago,IL 70 Malibu
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