To my knowledge, RCV Performance is the only company making chromoly shafts for Ford TTB axles, so you might give them a call. They are CV shaft (not u-joints)... so while they bring huge gains not only in strength, but smoothness too, they are also priced accordingly.
Jeff's Bronco Graveyard also sells a chromoly outer stub shaft for the D35, which can offer a small strength upgrade since it's the part of the shaft that has the smallest diameter (the snap ring groove @ 1.063" if i recall correctly). Outside of that it's been slim pickings for our front axles in the chromoly arena.
You also can convert the differential to 30-spline using an aftermarket diff (ARB or Detroit Locker), a D44 TTB RH inner stub shaft, and a custom-splined driver side inner shaft.
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