Mine is a Seville STS with 143,000 miles on it. It has had the vibration in the front end since I purchased it a year and a half ago.
I did the clean up trick to mine this weekend, I removed the wheels and wire brushed the hubs and the inside of the wheels. Also rotated the tires while I was at it, driving to work this morning I had no more vibration.
So this seems to have fixed mine for the time being. I did check out everything else while I had the wheels off and noticed that the drive shaft where it goes into the transmission has a lot of slack in it. If you take a prybar and pry against the inside CV joint it has almost 1/4" of slack. I don't have a shop manual, so I don't know if this is normal or not.
I did the clean up trick to mine this weekend, I removed the wheels and wire brushed the hubs and the inside of the wheels. Also rotated the tires while I was at it, driving to work this morning I had no more vibration.
So this seems to have fixed mine for the time being. I did check out everything else while I had the wheels off and noticed that the drive shaft where it goes into the transmission has a lot of slack in it. If you take a prybar and pry against the inside CV joint it has almost 1/4" of slack. I don't have a shop manual, so I don't know if this is normal or not.