highway vibration

after replacing all of the suspension parts om my car and re adjusting them several times i have finally found my vibration problem!
it was the rear end. it is a 8 1/4 out of a 1973 dart and someone told me i should check the axles and bearings on it and sure enough i took it apart yesterday an found that one of the axles is egg shaped with a 16th inch deep grove in it where the bearing rides. so now i am putting a 8 3/4 housing out of a challenger and a pumpkin with 323 suregrip gears out of a original AAR cuda.