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You are most likely dealing with a GM "corporate" 10-bolt 8.5 inch ring gear axle in BOTH trucks.

The axles will have many things that will interchange, BUT where they mount may be slightly different, like stated above, measure to confirm.

The only internal difference may be the spline count on the axleshafts and the side-spider gears, the older ones had 28 and they switched to slightly stronger 30 spline gears in the early to mid 80's.
 
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