Hey Beau, one way you could eliminate the rearend, is to just swap one in from someone else's truck for a few minutes. Shouldn't take more than a couple hours to do, would be and easy way to tell where the vibration DOESN'T lie anyway...

 

It's funny that you have brought this thread back from the dead. I was on the phone last week with Beau last week. He is going to ship it up for me to look at in a couple of weeks. I told him no problem and that I would do what I could for him. Vince