Electric arc welding of any type would be a extremly poor choice for this repair.
Brazing is a process above solder temperatures but below fusion temperatures. Simpliy put, brazing is a surface smear of metal. It has it's purpose but not on this application as it's just too weak of a repair.
O/A gas welding would be the best welding process choice. Here you will want to "V" notch the crack too a point just shy of 100% of base metal thickness, and extending the "V" atleast 1/4" beyond the existing crack, then O/A gas weld using a cast iron filler rod.
When done welding, quickly peen the weld face (surface) to remove tension then bury in dry sand until cool.
Predry your sand by spreading the sand on sheet metal and let dry in the sun. Use cinder blocks to make a temperary box form, then add dry sand to the bottom, put in your repaired part, then cover with sand, cool for 24hrs. About 2" of sand on top and bottom.
Since this sounds like a high stress repair area, YMMV with ending results. A replacement gear box might be a better solution and keep one this for a quick change out for next time.
If time is money, then replace the gear box, new, period. This would be my choice on my equipment if I was making money with it.
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