If that's the 4 speed in 31-47s, they are pretty solid unless badly abused. If water got in and sat there could be rust issues. If you don't like the look or feel of the bearings and seals in yours, I found them for mine as stock items at my local suppliers of bearings. It wasn't hard to find, more choosing price vs comfort with origin/brand of bearing. You can take in either the numbers of the old bearings or the bearings themselves for measurement. The gaskets for top and PTO covers don't need to be a very specific thickness, just close to the original. Cut your own if you want.
