I just replaced both half shafts on my '98 accord and I am experiencing vibration driving
60+ mph. No sounds or strange movement happening any other time . Can someone tell me what the possibilities could be?

 

There is actually the chance that one or both of the halfshafts are bad out of the box. Where did you get them from.

 

Does it vibrate all the time (over 60) or just when your either accelerating or of the gas? You prob just need a wheel balance