strange vibration

H i all wondering if anyone can help me a have a mg zs diesel with a wheel vibration at 70 to 80mph? Been like this for a few months but i put it down to pot holes and wheels needing balanced. Its not the wheels they have new tyres and have been balanced. I also had the car jacket up one front wheel at at a time and took the wheel off, put the car in gear and got the speedo up to 70mph and the vibration is still there. I am wondering where to start? Is it more likely driveshafts or the gearbox? as its both sides that vibrate. I have changed both outer cv joints in the last year but didn`t think that would cause this, any help would be appreciated....regards aj

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