The full-size blazer rear ends are narrower than the pick-up rear ends.
If you do a search, I posted a link to rear axle widths a long time ago. SHOULD still be here on the bolt some place,,,,

There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!