I've got a Frigidaire Gallery front-loading washer that I bought in 2005. It runs great, but today when it reached the final spin cycle, at the highest speed, the basket began to shake violently inside the tub (loaded and unloaded). It sounded and looked like it was banging around inside the tub. It did not do this at lower speeds. The tub it not moving around more than normal. I replaced the dampeners about 4 years ago and they're still fine.
I took the belt off and tested the drum and the motor. Spinning the drum made no noise - I expected some grinding from the bearings. The motor did produce some grinding which is probably bearings, but wouldn't cause the basket to shake.
I don't want to take it apart more until I have a better idea what to look for. Is it the bearings in the tub? Or is there something else I need to look for?