John Kunkle (spelling) on this board posted the specs on both the yoke, and the bushing, it was pretty tight if I recall .002-.003 clearance, the problem is aftermarket bushings are bigger, aftermarket yokes are smaller so it can be hard to fix. I have had to resort to having yokes hard chromed to tighten it up. Last one I did with bushing from brewer and a neapco yoke moves a lot, way more than an untouched original. I tell guys not to change the output bushing if it is still good, I believe originals were machined in the housing.