inside Kawasaki mule 2wd rear differintal/ transmission

we had to split the case on this mule transmission gear shift shaft broke. we welded it back from the outside once and it broke again. so we found the same size shaft believe its from a Kawasaki brute force 4 wheeler. we are going to cut the broke shaft out and weld in what we need of the new shaft. would be better to just replace that part, we had trouble finding it so we will make it!