JW51 When I build a driveshaft I put the tranny yoke in a 3jaw chuck,put a machinists level on the u-joint hole set the other yoke the same way,tack it 3 places. Run the shaft if the yokes are wobbleing cut the tacks adjust with hammer. once it's welded is probably in balance too.On a racer can balance with a strobe light wheel balancer and hose clamps ! That's kinda crude though.
