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i just had the 2 front tyres changed and balanced , before i had them done i swapped the rear wheels for the fronts. now when i reach 60 the cab shakes and vibrates at 65-67 it goes away , i dont get wobble from the steering wheel - question is this due to the front wheel balance just done or is it the rears causing some kind of prop shaft imbalance. before i go get the rears balanced and spend another 20 quid.