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Oe Posi Numbers

740 views 2 replies 2 participants last post by  oldsmo 
#1 ·
Does anyone here have a original GM parts number for a 8.5 28 or 30 spline posi differential case? Any years between 85-88. I believe that the 30 spline will fit right in were the 28 spline was only you would need the axles to go with it correct?

Thank you....
 
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