A little follow up. I managed to make the rag joint I ordered work. I thought it was too small, but it fits ok. Better than a hockey puck I guess. The rag joint which I removed was hand made, and poorly. Still, no improvement, still a touch of wander, and I think it's the gearbox still. Doesn't anyone know how to rebuild these things properly?

OK apples and oranges time. I have a 74 vega which had a good bit of wander, and it was the gearbox. I know they're cheap and plentiful, so I figured I'd try an adjustment if I tore it up, then it needed replacement anyway. Well, I loosened the locknut and ran the screw in till it took out the slop, being careful not to bind it. Now the Vega tracks straight as an arrow. Time will tell if my adjustment will cause premature failure of the box.

So, I'm wondering how big a deal is it to make the adjustment on the dodge box? It will kill the warranty, but I don't think I'll care, if it will tighten it up, and won't damge it. I wasn't worried about the vega box, but this one is a lot more expensive and a beast to swap out.