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A Z71 posi is a gov-bomb they SUCK in a huge way. The car posi is way better. The difference between them would be years not car/truck. In '89 I believe they went from 28 spline to 30 spline.

The gov-bomb is marginal on snow or mud but violent and scary on pavement till it breaks and it will.
If an open diff then it should be fine.

There is some chance the carrier bearings could be different. I know when we put aftermarket posis in we end up needing new bearings and cups and I thought those were "truck" parts, carriers are interchangable though.
 

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Discussion Starter #3
its out of a 99 ZR2 Z71 blazer.
i did buy a 8.5 axle out of a roadmaster that had 190,000 on it. think it needs to be rebuilt. dont now were to get parts or what to look for.also looking for 3.73s
 

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Summit and the like will have all the parts. It is a 30spline 8.5" 10-bolt, get the recommended carrier bearings.

Are you aware the Roady axle is narrow to clear the skirted wheelwells?
 
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