Ford falcon ba mk2 xr6 drive shaft noise and vibration?

So I have just removed my tail shaft in My ford falcon ba mk2 xr6 and replaced the centre bearing and uni joint, after I had put it all back in the car, as soon as I try drive over 20km I hear a loud knocking noise and the car vibrates aggressively, what have I done wrong, could it be the cv joint? When I put it back in I didn't really know how to do it and just had a guess.

Sound like u-joint installed incorrectly. I would not be driving it. You don't want to know what a broken u-joint feels like.

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