I'm skeptical that the LCAs are the cause of your vibration. I'd check what the previous posters mentioned, the wheels and wheel bearings. It is possible that the control arms are the cause of the vibration if they are completely shot, but I think you'd feel clunking and slop in the steering besides vibration. How many miles are on the car?
Why didn't you replace the LCAs when you replaced everything else? You will need an alignment after you replace the control arms, BTW.
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