A buddy of noticed the '71 style (gull? boomerang?) spoiler on my GTX furiously vibrates up and down at hiway speeds. This is the second wing that does it, I had to replace it a couple of years ago due to stress cracks around the mounts.

The thicker '70 go wing on my Challenger does not.

Is the vibration common, or do I just have a cheapie wing?

Thanks

While outside on the turnpike They got this new hit tune Where thrills become as cheap as gas And gas as cheap as thrills