Steering Knock

My 99 Durango has started making a 'knocking' sound in the steering column. It knocks about every 1/4 turn in both directions. This can also be felt in
the wheel. It almost sounds and feels like it is catching on something in the column right under the wheel. I have taken off all trim and found nothing. My mechanic found an old TSB that said to R & R the steering wheel and all attaching hardware and re-torque to specs. This was done, but did not help. Any other ideas?
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Inspect the intermediate shaft (shaft that runs from the steering box or rack to the base of the column). The U-joints in that shaft can wear out, causing slop, and the clunking that you're feeling.
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