Before my dad was hospitalized we were working on his 62 polara 500 413 max wedge. I would love to get his car done for him. When we put the drive shaft in w/ the car on jack stands we ran it. It had a vibration. We took the drive shaft out, no vibration. I need to find a place that can balance the drive shaft. We always to our shafts to a place called HEAVY DUTY PARTS. They cant do it. We live in north central PA. 17856 Any ideas ?