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Lots of truck applications had 30-spline axles. I wouldn't use them in a car with a clutch and slicks.

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What is different about the truck vs. the 30 spline in an 8.75 ?

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The end of the axles are different All kidding aside 8 3/4 axles will fit the 30 spline posi perfectly if your cutting a truck Dana down to fit in a B body As far as using stock 8 3/4 axles in a 4 speed OP, buy the 35 spline conversion kit from Cass at Dr Diff and make that posi a 35 spline,a new set of axles are needed anyways so buy the best size That will be money well spent