Umm, licruiser, before you write us all off do a search on stuck in ga's previous threads and you will see that the rest of us react to him a lot like you. In fact after all the statements he's made about reforming, I find it hard to believe that is Josh posting and not one of his high school buds using his login. If it is Josh, I won't bother scolding him because it is useless.
Anyway, to try to answer your post, I do not think it is birfields. Birfs click when you turn and tend to click most when you turn hard from a standing start. I have never heard of birfs clicking when driving in a straight line although I guess it's possible. Highway speeds only noise is tough. I also thought u-joints tended to make noise when you coasted under idle (no power to shaft allows the play). Have you tried driving with a passenger switiching from seat to seat and testing whether the noise is louder out of any particular window? Also, try driving slower beside buildings or a solid fence at slower speeds and see if you can hear it at slower speeds then too (the wall will magnify the noise).
Also does the clicking vary with speed or rpms? Is the clicking a high rpm ratatat or more a clunking or popping? Like a baseball card in bike spokes? Seriously, a more detailed description would help.
Finally, to take a wild ass guess, I would check to see if the heat shields on the exhaust pipes just in front of the catyltic converters are loose, and also see if any part of your exhaust has any play.
without the smile
