Bad U-Joints are often hard to detect. My suggestion is to pull the driveshaft. Move the yoke and the rear joint around the full range of motion. Try to feel for ANY rough spots at all. Also, hold the driveshaft in position, and try to turn it by grasping the U joint and twisting back and forth. You shouldn't be able to get ANY play.
When you have the driveshaft out, tranny fluid will have a tendancy to leak out of the tailshaft of the T-5. If you're lucky, you have a stub shaft you can stick in there, otherwise, I'd put a little pan underneath it and try to have the car jacked up in back.
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