I gave up on mine. I think it is the axle but don't have the resources to keep at it. I did yokes, driveline, driver axle(which was bent), shocks(which were bad), Tranny bushings(which were shot), swapped to another set of same size tires/wheels and no change. I've gotten used to it but it bugs me that after all of that it is still there.
Good luck with the search, I'm always interested in what remedies work.