I looked at other comments and decided to change out the snubber, and because I had to remove the springs and belt anyways, I decided to change them both. I found that there was quite a bit of white powder around the snubber ring, so it had been wearing down. I will say that it really didn't look like it needed to be changed, but I changed it anyways. As advertised, the springs were not real easy to get out as they were very tight. Also, the new springs were even harder to stretch. For the most part, the only ones that were overly difficult, were the ones in the back that I had to change through the cut-out in the back. It was hard to be get low enough to get my hands inside the cutout, and having to stretch the spring up to attach it. My best advice is to change the springs in the back first to make them as easy as possible. The belt was pretty worn, so I think it was worth replacing.
My washer is running smoothy and quietly now and no shaking during spin cycle at all. I'm glad I made the repair the way I did, but I guess you might want to consider just replacing the springs and belt. It's a much easier fix, and would take about 1/2 the time.
My biggest suggestion though, is to make sure your washer is level, and re-seat the self leveling legs in the rear by lifting he rear of the washer a couple of inches and dropping it down until it feels solid and level. That actually made the biggest difference and was a free and easy repair.