last weekend i did a b&m short shifter with skunk 2 440g billet knob. also an energy susp. urathane bushing kit. everything went realy smooth but now at hight rpm's like above 5000 it is making this wierd vibration noise. its kinda loud and its starting to piss me off. anyone have this problem and know what it is? i have checked all bolts for correct torque settings so that all checks out.