We had a final drive housing years back that we welded up the bearing cup to get it out, but after four attempts and four new cups, we gave up trying to get the new one back in, took the housing in to a machine shop, turns out the cup housing was machined oval, but we had the housing machined back to spec. Just tossing it out there, sometimes the housings are not round or machined right, but to date, the final drive has never had another issue.
We think the factory used a large press to press the cup in, which ended up either flaking the surface of the cut, or ovaling the cup enough to cause bearing failure, we had welded up the cup to get it out, so it was too late to look over the cup like we should have.
Now if we have bearing failures before they should occur, we mike the housing and double check to see if its round and to spec and before welding up the cup to get them out, we look very closely to see if there are high and low spots worn in the cup, which also give an indication the cup isn't round and might be the reason it failed before it should have.
We've also had a housing with a bearing cup in both sides, that the holes we not machines straight across from each other, causing the bearings to run crooked but couldn't due to the shaft being run straight, which caused the bearings themselves to take up the slack, not surprising, the bearings always went bad, till we remachined the housing so both sides matched and the bearings ran correctly in the cups. As they say, sometimes its not the bearings, cups or who's doing it, but the company who machined the housings.