I might give it a shot depending on the price. The stock transmission is pretty durable, but if your going to be dragging it, or just have it apart allready, I might give it a go.
Here's a bit of information from my experience. It is commonly known as "case hardening" in metallurgy. Basically, you heat it up to near melting and then "quench" the hot peice of metal. This leaves all of the molecules in a random order, with no seeems and very small crystals. This means, no weak spots. It works, and it's proven to work. Has been used for a long long time, but the faster you quench the steel, and the colder its done at, the better it works.
Im sure everyones seen a movie where a blacksmith tosses a red hot horshoe into a bucket of water. Same deal, except you use something much much colder then water.