Symptom: At certain speeds (70 mph, 40 mph, etc.) there is a noticeable vibration.
Vehicle: 1998 GMC Sonoma (2 wheel drive)
The vehicle was purchased used and had similar symptoms at the time. It now has 137,000 miles on it. After getting alignments and replacing the tires, it is not as bad, but I might just have gotten more used to it. Since it has been through a few sets of tires now, it has eliminated my suspicion of the wheels being out of balance.
What should I check next?