I would recommend that you contact Dynotech Engineering in Troy, MI. Ask for Jim, tell him your vehicle and applications and they can man a shaft for you or you can send yours in and they can put the proper yoke onto the shaft and balance it on their homemade equipment. I would recommend you have a custom shaft made though because the weld yokes on a stock shaft are cast and will probably break the next time.
I bought a custom shaft from them, it cost 511 bucks. Steel shaft with forged weld yokes, cold forged 1350 u-joints, and a viper slip yoke that fits the 727 and since it fits the 727 and the T-56 it fits the 46RH! All Spicer components, except the tube of course. The pinion yoke is forged by Victory Performance, it's for the 29 spline chrysler 9.25" and it fits 1350's. Shaft length was like 61.375" tube diameter 4" and tube thickness .083" tube weight was only like 29 lbs, I could of gone with aluminum but since steel is stiffer there is less power being lost in the angular twisting of the steel, so there is more hp being put to the wheels than if I was to use carbon fiber or aluminum. The only problem with a steel shaft is the inertia so the critical speed is lower than carbon fiber or aluminum. For a 61" shaft both dynotech and I have calculated a critical speed of aprox 6200RPM, so with the correct wheels and gears I am safe for 150MPH, which is good because I only plan to go up to 145MPH when I drop my new engine in.
Anyways I didn't intend to go into the engineering, I cannot help myself, I am a ME student... and this stuff interests me.
Anyways if you don't want to go that route...just go and buy a billet or forged yoke. I do recommend you just replace the entire shaft, like I said those stock yokes are all cast so if your slip yoke ear snapped then it is only a matter of time before a tube (weld) yoke does the same.