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Message: <blockquote data-quote="MustangChris" data-source="post: 516508" data-attributes="member: 10830">alright everyone.. after doing my suspension i feel alot more of the road and whatnot... anyways. when im on the highway and i get up to a pretty good speed (70+) i hear a vibration run through my car. its VERY noticeable. it happens about every 4 seconds, and it feels like its "rolling" through the chasis...I will first feel it in the steering wheel (heavy vibration) and then it will make my rear view mirror vibrate (like my subs are bumpin') and i dont feel it in the wheel anymore... then i feel it in the butt of my seat and it goes away... 4 seconds or so later, it starts at the front and rolls on back... i drove on multiple pavements, so i know it wasnt the road i was on...heres a list of junk i did to my car:99 cobra steering rack03 cobra a armsbbk gripp springsused tokico shocks/strutsprothyne bushings all around (front and rear)aluminum rack and pinion bushingsbump stop kitsolid motor mountsnew end links (for a dropped car)caster camber platesused screamin deamon coilsused thomson wiresnew NGK plugsfull tune updrilled front rotorsnew front brake padsnew yokohoma all season tiresprofessionally alignedsolid steering shaftand thats all the major stuff... i wont mention junk like "a/f gauge"....anyways, the reason im asking is because its VERY noticalbe. and it doesnt speed up or slow down with the car... (i go 80, it still goes through the car every 4 seconds or so... i got 70 it still goes every 4 seconds) im at 3,000 RPM at 70 MPH (4.10s) so, does that have something to do with it? when i speed up or slow down (in turn, changing the RPMs) it still happens...it drives me crazy! >.<anyways, any thoughts, or anywhere to start looking?thanks,Chris</blockquote>