Yes, if you draw a line from the tranny output to the pinion input it would be down 4 deg from horizontal except, the height from the ground to the tranny and from the ground to the pinion is not the same. The tranny is obviously higher up off of the ground than the pinion output. Wouldn't that have an effect on things?
I have tried dropping the nose of the pinion a degree or two from there and and makes the vibration a little worse. I think that is actually where I have it set right now.
I have a sketch drawn up in auto-cad but I don't know how to attach it. Is there a way to attach an image or PDF?
[IMG]C:\Documents and Settings\jlauzon\My Documents[/IMG]

 

Upload it here: http://imageshack.us/

They'll give you an URL that you can put in the IMG tags.