How important is it to have a driveline balanced after it's been resized ('72 Skylark to 455/TH400 swap)? I ask because there are only two shops in my town that will re-size my drive shaft, but neither will balance it. The nearest place that can balance one is 1.5 hours away. I don't really want to drive that far if it's not that big of a deal BUT I don't want to wipe out any bearings or seals if balancing is a MUST DO.
