I have a "42 M Farmall, which I rebuilt quite a while ago. I cant for the life of me remember if the differential carrier rides on tapered roller or ball bearings. I noticed thru the fill hole that I could (just barely) rock the ring gear a little if I pried on it with a bar. If it has ball bearings, I would imagine this very slight amount of play to be normal. Does my M have ball bearings for the carrier? Is a little play acceptable? It seems that I remember all roller bearings I have ever seen had a little play to them. The gear oil is clean, with nothing in it, and the gears all look fine. What do you guys think?