can anyone tell me the best way to replace the u joint in the front next to my tran. I have a gt so the "H" pipe part, and the cats are kind of getting in the way. Any Ideas?????

Is there room to remove the rear U-joint and pull the whole shaft out the back end of the car? On most cars you have to take the rear off to get at the front one anyway.
You could always take off the exhaust.