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Driveshaft loathing and self doubt 200

I have been chasing a driveline vibration for a week that has me batty. It was very slight, barely noticeable originally, but I'm so anal. Found the center bearing carrier badly torn. Changed it and the vibration got much worse--only on takeoff at about 5 mph. I pulled the shaft, found the front joint binding in one direction and the rear one a little rough. Middle joint was perfect, smooth and solid. I hate doing U-joints so I took it to a shop. They swapped in the joints and found the shaft out of balance. All back together tonight as the wind is howling, but absolutely nothing has changed. Obviously something about the height of the center of the shaft changed when I changed the support. Bushings out back are in more than good shape. What could I have missed? No leaks at the back of the trans--it's dry and the mount isn't squished. I did the tail shaft bushing some time ago and there is zero slop. Wish I could shim the center bearing! Suggestions bricksters?
Thanks.






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