It's there while I'm driving, pretty much all the time. It seems more noticeable while I'm driving on the highway at higher speeds. Originally it almost felt like a little bit of a wheel hop. I can feel it through my feet, a little through the steering wheel, and notice the side mirror vibrating as well. It sometimes feels like the steering is a bit loose. For awhile now it seems like I have to keep the wheel turned slightly to the right, but after a 100 mile drive this afternoon it felt like it was almost drifting back and forth on me going down the highway.

I don't know what it is, but I have lost trust in the bigger repair shops. When I first purchased the truck 6 years ago and took it to Sears for new tires, they said the tie rods were bad and they couldn't do an alignment on it. I took it to a Chevy dealer as it was still under warranty and they said the tie rods were fine, they just needed lubricating or something. With this recent problem, I took it to a Goodyear shop and they said it needed an alignment and dinged me for $80. I talked to a manager at another Goodyear shop and he told me they were wrong, that it was possibly a bad shock, a warped rotor, or something loose in the suspension. I'd just like to figure out what it is and get it fixed soon. She's got a 101k miles so I don't want to pay a lot for the repair, just need it to last another year or two.