I can agree that it could be a balance problem with the drive shaft but wouldnt it be a constant vibration, its smooth as silk at high way speed ? I didnt realy want to use 2 different shafts but the wonderfull junk yard I got my engien from decided it was easier to cut the shaft in half rather then take out the bolts to remove the engine and trans

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82 240D (82 300D drive train)