I have had my GTP for 3 years now, and for about two of those years it produces an extremely loud vibrating type noise, it appears to be coming from the front end. It starts when I approach 30 mph then gets progressively worse as I increase speed. If I place my foot behind the pedals on floor board I can feel the vibration. Anybody have any ideas what might be causing this?

Thanks!

I'm no expert on the GTP but I would look at the motor mounts. I hear the uppers are soft anyway.

Good Luck and let us know!