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When i get to a serton speed in my car i hear this loud huming noise from the back end of my car. happins most in second gear at around 4000rpm.

And there is a nother one coming from my front left driver side wheel. it sounds like really high pitch chattering. i think it is my spring but not sure. Axels are all good.

My wheels hummed alot on my stock GS. I think they had flat spots that would make a slight sound on each rotation, which didn't sound like anything until higher RPMs, especially when they hit that magic resonance, that causes everything to vibrate together, and the combined sum is more than the individual sounds. It sounded like a really cool UFO, but not cool for a car. Also, check to see if your muffler is rubbing.
Post your findings, since these cars are relatively loud, and everything helps.