There is the 2 hose clamp trick.
Alows you to rotate the mass around the drive shaft. Some experimenting required.
Set the car up on jack stands, put a glass of water on the hood and watch it shake. As you move the weights around the drive shaft it either gets better or worse.
When you locate the positions that create the least amount of vibration, then you are close to being balanced.
Next step tape on a weld on weight in the position of where you had the hose clamps. Test again better /worse > slight moves to the least vibration. Then weld it on...
Or you can just take it in and get it professionally balanced, depends on how far out of balance it is. When the pros do it they straighten the driveshaft to zero runout first, then they balance the shaft after it is straight.
It's all about getting rid of unwanted vibration.
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