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I have a problem that I think started (maybe) after I got my slip yoke greased and seems to be getting worse. This could be a complete coincidence.
At around 30 mph I feel a vibration in the steering wheel. Goes away just past that speed. Then at 40 mph I can kinda feel a slight vibration from my seat and a kind "rumble" noise in the cab.
The dealer did the slip yoke and I did see where the driveshaft was marked.
I have new tires all around. I replaced them for other reasons but the steering wheel vibration was there before they were replaced. It seems to be getting a little worse.