I HAD THE SAME PROBLEM UNTIL I WENT TO AN ALUMINUM DRIVESHAFT. HOWEVER IF THE VIBRATION COMES IN WAVES(VIBRATION INCREASES AND DECREASES) IT COULD BE YOUR HARMONIC BALANCER. BELIEVE IT OR NOT YOU CAN TWIST THE OEM DRIVESHAFT. TO CHECK THE DAMPNER: START YOUR CAR AND POINT A FLASHLIGHT ON THE DAMPNER. IF IT IS GOING OUT IT WILL WOBBLE LIKE A BENT BICYCLE RIM. WORKS BETTER TO DO THIS WHEN IT'S DARK OUT SO YOU CAN SEE IT MOVE BETTER. IF IT IS THE PROBLEM, DON'T WAIT TOO LONG TO CHANGE IT. IT WILL COME APART. THE DAMPNER IS A TWO PIECE DESIGN. ALSO EXCESSIVE HARMONICS CAN BREAK DOWN YOUR MOTOR.
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