Have a 1998 Tahoe there is a rattling noise in the front when you drive?
My 2001 Tahoe did the same thing. Everytime I hit rough road,
speed bumps, or even a tight turn, I would hear a rattle in front
and a vibration in the steering wheel. I asked a mechanic at Tires
Plus to look at it and he said the steering column shaft was the
culprit. $125 later (which included labor), problem was solved.