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Discussion Starter · #1 · (Edited)
I want to purchase a used GM posi for my 8.5" 28 spline axle. Problem I have is that I don't know how to identify a series 2 from a 3 and want to avoid the spacer if possible. Can someone help with this please? Also, what casting number is correct for the 28 instead of the 30 spline axles?

Thanks, Ed
 

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Discussion Starter · #3 ·
OK, that identifies the right carrier but isn't there another number that makes it a series 2 or 3? Like the GM 2 below the casting number or the big 6 or 8 at each corner.

Ed
 
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