do not think mentioned, but you can get your drive shafts balanced.
and phasing is important too.
can also even get them straightened if needed if something was hit causing vibrations.
but i was fooled completely by a sticking front brake and vibration that seemed coming from drive shaft/auto brake area.
btw, it is my opinion that if a by U joint occurs it is normally the front one, and it will 'clunk' when shifting in/out of gear - and always clunk.
also, you could always drop the drive shafts (mark them at each end !!!!) and check each U joint, no fun but not hard just dirty, a ratcheting wrench helps, can 'hang' it so it does not rotate when twisting other side.