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  1. 1970GTX

    Correct Rear Axle?

    Hi all, My '70 GTX has a 8 3/4 diff with 742 casting. Is this correct or has it been replaced at some point. Everything I read is that the 742 castings were phased out in '69 and '70s should have a 489 case. Build date is Feb. 1970.
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