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Vibration in drive train:  at 25-35 - 45-50 and worst at 58 mph.     Can feel it and hear it both.    rear end completely dissassembled (not problem) new rear drive shaft, all joints checked, right rear bearing replaced.   new tires.    Local GM dealer gave up, sent to Suzuki in Fargo who replaced drive shaft and said it was the spare tire, but no change.   so put on new tires.  no change.   Everyone gives up.    including a local mechanic.

Can it be the torque converter in the tranny?