I recently purchased a 99 7.3 that requires a new gearbox. It’s the 4R100, as I know. Just curious if anyone on this site has any recommendations or thoughts on which one I should acquire.
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Take it to Ford. Mine cost $5,300 out the door for a 3-year unlimited mileage warranty.
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The Ford warranty is hard to beat.
Was the $5,300 installation cost or was there a part already?
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I would love to brag that I rebuilt my 4R100 myself, but didn’t have the time 
. Ford’s prices are not too bad if you can actually get your vehicle in, though. Sometimes the wait feels like forever before they can get to it!
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The general consensus is that Sam Wyse or BTS are top choices for a 4R100 rebuild. However, any reputable transmission shop should be able to handle the rebuild with upgrades to the valve body, snap rings, center support, torque converter, and so on.
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If I were to have someone else build it, I would go with BTS, 
but I rebuilt my E4OD myself. I used Alto Red Eagle clutches, Kolene steels, and the TransGo kit. If I were doing it today, I’d choose Raybestos GPZ clutches.
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Reach out to Dave’s Auto Center in Centerville, Utah, if you are able to mail it or just chance to be nearby. If they don’t recommend a triple disc converter, have them rebuild it and make that request.
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If you can send it out or are nearby, contact Dave’s Auto Center in Centerville, Utah. Have them rebuild it and ask for a triple disc converter if they don’t mention it.