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A second mismatch unique to the A-Body was the small diameter center register found on the face end of the axle shaft (A). All other 8 3⁄4-inch flange type shafts used the same large spec register (B) to locate the drum concentric with the shaft. Notice that the flange face on the large bolt pattern shaft (left) is much larger than on the stock A-Body piece (right). The small face of the stock A-Body shaft gives just enough material to be redrilled to the large pattern.