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Re: 6 lug to 5 lug rear axle swap
1970 was the transition year for the width of the rear differentials, Typically the early '70 rear differentials were the narrower version as the prevoius years. The late '70 differentials were 1.5" wider overall (.750 per side) like the '71 and up differentials. That is why you can't use a '71 and up axles in the '63-early '70 differential housing.
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