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12 BOLT REAR END

chevyfan77

blazing trails
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I have a 77 K5 blazer and for now (and for awhile) I will keep the stock 12 bolt rear end in the truck. My question is, did any blazers come with the 28 spline rear end or did they all come with the 30 since it is a truck?
 

Wes Harden

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I would think since 6 lug axles they would all be 30 spline and the 5 lug car axles are 28. May be different for 1st gen.
 
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