70 Nova with manual steering and occasional vibration in the steering wheel when turning. It feels exactly like turning a hand wheel on a lead screw that needs oil, if you know that feeling. I've greased all front end parts and I've added grease to the steering box and I've lubed the upper steering shaft bearing. I'm trying to avoid pulling the column out to replace the lower bearing so I'm asking if you have experience with this issue. Thanks for any advice.