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GM 8.5-inch 10-boltThis is what you're looking for if you want to replicate our efforts. The 8.5-inch axle went into service in most '71 car lines, but don't make assumptions as it wasn't always the sole choice. The smooth, round cover with 10 bolts narrows it down, but the 8.2-inch housing is very similar. We think the best tip-off are the angular casting "ears" seen in the four and eight o'clock positions of the housing. We haven't seen these on any of the 8.2-inch rears we referenced; all of the 8.5s we checked, including some for other applications, seem to have them. View Related Article
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