2wd vs 4wd rear axle widths

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1984dually

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Danny
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1984
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C30
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8.1L
Got a 86 blazer 4wd and 85 2wd 3/4 ton. Rear axle housings interchangeable? Wanting to go to 14 bolt rear end. Thanks
 

bucket

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350-454
Axle for axle, the overall width was the same for 2wd and 4x4.
 

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