Makes sense coyote, but after hearing that your T-case flange is loose, i would garuntee that that is your problem.
My friend had a loose flange on the T-case and his truck vibrated worse than a Cat D8 doing 90mph on the freeway. i mean it was bad. I would fix that first
![Big Thumb Up :biggthumpup:](https://board.marlincrawler.com/Smileys/marlin/biggthumpup.gif)