I started out by replacing the rods. You can tell if they need replacing if the tub is not stiff to movements. Be mindful of what nuts or screws to take off to slide the cover back. It varies from machine to machine. That did not fix the problem. But I definitely needed to replace those rods. I then replaced the spindle and the washer that holds the tub down. I had read that the washer can cause problems. Mine probably needed replacing. I would get more problems with heavier loads. I then replaced the clutch kit. I then saw some major improvements but still had some shaking. The last thing that I could replace was the belt. Once I did that I ran a full load, and I did not have any violent shaking. But when I did that, I was very careful to balance out the clothes in the tub. It is also very important that you take a level and balance the washer. The old belt did not look bad but where it lay there were black streaks on the wheel and the pulley. I took some alcohol and some paper towels. I rubbed until no stains came off onto the paper towels. What I should have done was to take a small screwdriver, wrapped a paper towel around it, and put it into the grooves on the pulley. I would be careful what solvents you use. You don't want to strip the motor of its lubrication or dissolve some plastic parts. Perhaps some soap had gotten on the pulleys and belt. I noticed that the washer seemed to run "smoother" now. Could it have been slipping and that cause the violent shaking? It seems that I really did need a new belt even though inspecting it I could see nothing wrong. It did not appear stretched. But parts of it had rubbed off onto the pulleys. I would up doing a complete rebuild. Any other parts would cost $100-$300 and it would not be worth repairing.