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Before bolting up the driveshaft, make sure you have the right yoke, as two different U-joint sizes were used on the cars that came with 8 3/4 axles. The spline count affects yoke interchangeability, and so does the pinion type; changing yokes on the 489-casting-number case is difficult to do properly because they set pinion depth with a crush sleeve that can be damaged if you over-tighten the pinion nut. View Related Article
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