[68c10airstream]

I would double check the diagnosis. C/v joints are not balanced because they are machined to close tolerances and remember that they spin at wheel speed, say 600-700 rpms. If the boots were torn and click in turns then yes, but otherwise i would look other places. These attach at the differential so look for stub shaft play allowing the half shaft to move up and down. Crawl underneath it and grab the shafts and see if you can move them up and down. Could you have a tire imbalance??? rotate and see if it moves to the new location.