Dana 60 guys...quick qun

I got mine from a guy I met at Mopars in the Park. $1850 delivered with 4.10's, disc brakes and cross drilled rotors. All new and the mounts were set for an a body. I'm pretty happy. Three years now, and all is good. Except the driveshaft. Have it made at a place you trust and will take care of you. Mine is out of round again and I paid big money for race tubing, 1350 yokes, etc.. It is continuously giving me vibrations. they fix it and it's good, then it comes back. I am supposed to bring it to them on a day that's nice so they can drive it and feel the vibration.