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A quick history. I have a '90 LX 351W. Last year I rebuilt the T-5 with Hanlon Z-spec gears. The car drives well until 80mph and the stick shift handle shudders about side to side with about 1/4" movement. I have a corresponding vibration that feels driveline in nature. I have the Motorsport aluminum driveshaft. Could the driveshaft be out of balance, or is there a problem with the transmission?

Thanks in advance,
Scott
 
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