Just went to my neighbors to see about the bushings....nobody home. So I stopped by Fred's (meangreen) to see what he was up to, and told him what I was going to have our neighbor Randall do for me. Then Fred handed me a John Deere parts package. In it was a pair of spindle bushings he didn't need for his JF430. I'll be danged if they are almost a ready fit to this axle! Looks like I'll have to ream the tube just a little, then they should press right in. They are a perfect fit to my new bolt.
Not pretty welds, but they are deep & strong. I cut the spindle tubes from the main beam, then welded in a 1x1&3/4" vertical to the spindle tube, then the main beam to that. This widens the front end a bit over 3 1/2", which I needed, plus it raised the front end 1 1/2" as the axle beam was welded OE to the bottom of the spindle tubes and it's now welded to the top. I'll have no turning clearance issues at all now. I think before I mount all this that I will weld a brace under the pivot point to strengthen the main beam. Not much meat left at all under the pivot tube.
Oh, and the hole in the one added piece was already there, and I am welding that in. The bottom of the added section will also serve as a wheel turn stop.
Here are the bushings & the new pivot bolt. It was a 7" long grade 8 bolt which I cut down & threaded to the exact length I needed. It sure takes a good die to cut threads into a grade 8!