What have you done to the engine? How does it usually do?
I have a 1947 RTU, no engine work yet. I did my usual "Pull Prep" and took it for it's first pull on Labor Day. Let the son in law pull it, looked GREAT until the end. Back half bound up tight. Ring had chips broke off on every tooth, bearing cage bent. Found reminants of teeth but could not find cause. Washers for pinion shaft appear perfect, gears line up perfect, all bearings appear intact. Still searching for issue.
Was very happy with the way the engine performed, NO power drop at all,pulled 160%. Liked the balance for a 3200 pound tractor.