As it's behind the steering wheel it could be the needle roller bearing at the base of the column, I worked on a 1991 940 that had a very slight tight spot but only occasionally in the steering and would make a cracking noise when it went past the spot and you could feel it free off. I lubed the UJ's and it made no difference so I suspect it was the bearing at the base of the column but the owner didn't want to pay to have all the column out.
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