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The 83/84 Hurst Olds came with a 373 rear gear.....that would be a good ratio or a 342 gear from a Buick Grand National. The heavier duty rears were an 8.5 posi verses the standard 7.5 that the Cutlass posi cars used. I believe you will find the 8.5 unit on all Grand Nationals and 442 posi cars from 85 up....G body. Bad news is the 8.5 units are getting scarce and quite pricy....600 or more for the whole rear unless ya get lucky in a junkyard.
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