The main reason the Spicer half shafts were popular is because at one time they were cheaper than replacement u-joints for the stock units. That is not the case anymore and the stock units are pretty much bulletproof as long as they didn't have the workaround Hall smaller u-joint and shims installed, which can spin in the housings and prematurely wear the shafts.
If you need half shafts I have a couple set kicking around from CV axle upgrades.
Julian
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