Update:
Cliff said that my welds leaked hot dip fluid indicating, even though I preheated before welding, my 110v Weldmark 135+ just didn't have enough ass to start hot enough didn't penetrate well until further down the weld. He drilled an 1/8th" hole in the truss to help drain fluid that may collect in it during water crossings. My whole reasoning for solid welding it just went out the window. I was trying to avoid rusting out the inside of the truss. Ah, well. Live and learn!!!!
He also told me the axle was warped before I pulled it outta the junk yard, though my welding on the top didn't help the situation. Spun races in the diff's journal showed signs of massive wear. He was able to straighten the axles and clean up the wear, so I'm good to go, $580 later. The rear d60 was bout 1/2" outta whack. I'll pick them up tomorrow and ask him how I can advise my fellow homefabbers on welding trusses without warping the axle and post that advise here.
