Kenmore 80 Series (110.16882500) shakes like crazy on spin cycle

Hi All,

I have Sears Kenmore 80 Series (110.16882500) that shakes really bad when on spin cycle. I have done the following:

1) Made sure the machine was level
2) Verified the legs in back are free to move
3) Opened it up and saw that the springs are all there and connected (I counted 4 total)

The washing machine started shaking after my girlfriend and I moved (only ~5 miles and I do not recall and any serious bumps or drops) It was laid close to horizontal when getting it into the basement. I am not sure if this is relevant or not.

The washing machine is on a plywood platform in my basement.

Does anyone have any ideas how I can check other parts for damage, or what might be a possible cause? It seems like it shakes slightly less with a very large load. Some loads shake so bad that I can barely hold on, but it does not act like the load is out of balance (the tub doesn't bang against the side).

Any help you could offer would be greatly appreciated. Thanks!

Sam