I'm interested- - - -how was the driveshaft "straightened"? In about 50 years of working on them, I don't think I've ever seen a bent driveshaft straightened successfully. It's always necessary to replace the tube and check the assembly for runout in a lathe during the rewelding process on the ends. Then the re-tubed shaft is spun in a balancing machine and weight is added like balancing a wheel to take out any remaining vibration. The most common balance weight is a small flat washer, tack-welded to the tube near one of the yokes. The maximum runout most driveline shops will accept is about .015 inches.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!