I have a customer that has a 4wd bobcat truck/ loader. The front axel spline to differential is stripped and will need all new parts at a cost of a few thousand dollars. He wants me to weld the spline to the differential, of course we do not know what the steel is but it is either case hardened or something like a 4140 steel. I am thinking to use either some 309 stainless or 7018 to weld it. He feels the correct repairs would cost more than the thing is worth and if welding does not work all the parts need changing anyway so there is no big loss. Any thoughts?