Bad vibration

Glad you found the problem, just some insight if you have a driveshaft shop near by.......let them do all the work, do all the joints at once along with carrier bearing. Then they will balance the complete unit. Mine cost somewhere's around $150, and well worth it. This is of course you remove the shaft your self. That's the easy part.........delivering it in a Datsun 240z, priceless.