If you send me a pm to remind me, I will look and see if I can get you a axle part number in the morning. For some reason it seems like I've done that swap before.
the 72 is a 6 lug and was a manual truck and yes it has coil spring. I know i am going to have to reweld leaf spring and shock perches.
i am planing on running stock truck rallys and i have a set of 5 lug and 6 lug wheels but if i ever get a set of aftermarket wheels i did not want to have to buy two diff lug patterns
If you weren't so far away, I'd have you make an offer on the pair I have on the shop floor to take them off my hands.
And as for the information posted by fast68 I view his information as BAD, it's only my opinion take it or leave it.
I checked my references and find similar information to Prostreet6t9.
The 8.5 inch axleshafts were 28 spline with 4WD length being 31-5/16" and 2WD length of 31-3/8". Hollander Interchange numbers 1300 and 1204.
The 8.875 axleshafts were 30 spline and 4WD lengths were 31-9/32" and 2WD shafts were 31-5/16". Hollander numbers 1063 and 1062.
NONE of the spider gear sets interchange to swap a 12 and 10 bolt axle housings' shafts between the two. You can buy the later 8.5 spider gear set and swap it into the older axle to upgrade the shafts, same as the 7.5 inch GM axles. As long as you get the correct length axleshaft in the correct splin count to do so.
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