Found a quick fix!!!!!!!!!!
I have a sideline hobby of racing cars. Along my looking thru a wish book, I found a 36 x3/4 spline sleeve that fits a GM steering box. For a mere $15 and a little time,,I fixed my steering box problem. The sleeve fit right on the Dodge box,that has a set screw for keeping it on the box,,, I took the round plate that fastens to the rubber biscuit and cut off the original shaft. I then drilled the hole out in the center to 3/4 OD. I took a piece of steering shaft that is 3/4 OD and welded it between the round plate and the sleeve on the steering box. Absolutely no play and truck drives like a new one now. Also ,,inside the old original rectangular box was a pin thru a shaft and 2 little blocks. The shaft was rusted terrible and one side of the pin was about rusted into 2 pieces. Absolutely no grease in there at all. I'm glad I looked at this when I did...