9-Inch Vs. 12-Bolt Rearend Compararison
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Not all drop-out Ford rearends are 9-inch units. The easiest way to identify them is by examining the two lowest gear-case bolts. If the bolts are covered so that only a wrench will fit over them, it's a 9-inch. If you can get a socket over these bolts, it's not. View Related Article
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