What's the angle of the transmission output shaft? 12 degrees up is a lot to compensate for, probably more than shims can manage. There's an article in the Tech Tips section that deals with U joint angles and such, and since it's part of a Dana/Spicer tech bulletin, it's definitely more than just hearsay.

http://www.stovebolt.com/techtips/driveline/setup/index.html

For some reason the links in the tech tip are not working, but you might be able to look up the Spicer articles mentioned on the web. Good luck!
Jerry


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