The vendors all carry quality replacement oem size U-joints, IIRC they are about $40 ea.
Back when oem U-joints were ridiculous $$ it was popular to switch to Spicer half shafts, as they could be had for about the same price as a set of UJ's, so worth verifying you have oem half shafts. The aftermarket Spicers use a Ford truck u-joint.
Hall also produced a funky oem shaft replacement u-joint that was a Ford truck unit with sleeves. Well the sleves have a habit of spinning in the housing and rendering the shaft next to useless.
IMO if you are going to spend big $$ to upgrade your half shafts, go straight to CV joints, don't go from one antequated unit to another and expect a different result. The OEM half shafts are reputed good up to 800 HP so they are perfectly capable.
Julian
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