end play in rear hub.

I don't think so, Steve. As long as they don't wobble up and down or side to side, I think you are fine.

I should ask a few questions before I throw out an answer Steve. Have the final drives ever been taken apart on this tractor that you know of? If not, you're probably fine. If they have, there may have been a thrust washer left out at re-assembly. I still feel that you're ok but I wanted to throw that out there as well, just to be sure.

I still don't think 1/8" is a big deal. Now, if that distance grows, you got problems!

I suppose you could but I don't think I would worry about it. Everything has to have some movement.