"I realize that it's actually a metric size, but I have had good luck with SAE wrenches on metric nuts when they get into the 1" and above size range. Plus, SAE deep well sockets are much easier to find locally."

These ARE metric trannies and using SAE on any metric nut (or the other way around) is just asking for a stripped head.

Anyway, the nut on a 722 4-speed is a 30mm 12-point. I could not find one anywhere so I brokedown a bought a Hazet 900TZ 30mm off the internet.