Replacing the yoke? I would have that would be more tail shaft not drive shaft related.. I had a similar problem with my VT Calais a sharp crack like sound more predominant in the left side front passenger foot well at low speeds. Ended up being because the car was so low the drive shafts had binded up on the diff, causing the knock. Make sure to check the diff fluid for any signs of metal flakes. Also if I lifted the car off the ground rotated the wheels the put it back down the noise would disappear for a short while. Replaced the diff and all OK after that
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