The vibzzz are killin me!

The car is in a small garage with a slight slope to it and I havent any access to a lift. I have tried to check the pinion angle the best I can with the car on the ground, thats a no go a little to much gordo going on here. I put the car on dollies and try checking it, i figure the slope in the garage is a constant. Its a real pain to see the trans side but with the calcs I came up with I added a 1 degree down to the rear end and nothing changed. Ive used the regular protractor and the inclinometer for the iphone (a little sensitive). and nothing has changed. It is like a buzz, I figured that with the replacement shaft i could rule that one out. Thanks.