What's the clunking noise??

Green bearings. I will try a bottle of additive. Getting the Motorcraft that Dr. Diff sells. If it doesn't improve I will pull it out. Right now I just try to drive it in a way to keep it from doing it but it's rather annoying. As far as comparing noise lever to a locker, it's been over 20 years since I had mine. I know it could be loud at times too.