The Stovebolt Site Forums The Shop Area Driveline SM420, earlier vs later

When I got this truck, it had no rear motor mounts. I would say that would likely cause ths input bearing wear. Since everything else looks good and I've been driving it for 5 years with no complaint, can I change out this bearing only and regasket and move on? I don't have access to a press and the secondary shaft with the freeze plug type end worries me.