At high speed(85+) there is a noticeable vibration in my k5. I hear a noise I can't explain and after i let off I got a wierd smell I never smelled before. It was almost like some of the smells in the metalshop in school. THe idea of the smell of metal being cut scares me. The truck always has a vibe between low 30s and like 45 and I mean a bad one. You can see the steering wheel shaking and the console vibrates like crazy. Anyone have thoughts? Gonna check my rear fluid level but it should be fine.