On my particular build, the greatest vibration came from the chain. If you were to take the slack out of your chain (best to remove it altogether) and you were to take the individual links and squeeze them to go through their full range of motion...something like this: __^__
If you can't freely fold the links, voila! Just maintain the shape indicated above and give a good hard side-to-side force...to exert the sideways force to the links that are stuck..should free them up nicely.