Shakes in the front or back: steering wheel shake, or you feel it in your seat?
I had this on an e36. Nightmare to fix. I got HD FCABs that may have made me feel it. Tiny oval rim, tires that did not like sitting still in freezing temps, etc.
In other words, the solution may be numerous fixes, as the shakes are a result of many tiny imperfections which combine to make a serious shake.
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