HELP!!!!Put in 8 3/4 rear and it vibrates real bad

What about your u-joints are they new or used? did you loose any needle bearings. is it properly centered? Off balance?

You can get vibration from the driveshaft also.

Another thing to check before spending any more money.

Totally different vibration, but try explaining it to someone over the internet.

How much wobble at the wheel might be nice to know.