Thank you for the picture that explains things well. But now I have realized that it's not the problem. I have a very worn sprocket which would be on the Left side if you're standing in front of the vehicle. It's the sprocket that is attached to the slack adjuster . It has 3 sprockets Together which drive the rear and center wheels. The center sprocket is very worn because it's not in line with the next sprocket show the chain is Running at an angle. Do they have reproductions of this Sprocket cluster?