I'm having the same clunking noise on my L2250 left rear side. I jacked up the rear wheels and spun them. No noise. Spinning the right wheel causes the left wheel to spin the opposite way as it should. With the differential lock down, both back wheels spin at the same time. Same thing under power while jacked up. Then when I put the tractor down off the jacks and move it the clunk returns. Any ideas? I would send a video but it won't upload for some reason. Thanks