Hello, I have a 98 Tahoe 4 door 4WD, it has 423,000KMs, and when I shake the Truck from side to side, the rear left end squeaks. When I am driving and hit any bump in the road it squeaks and Rattles like loose metal hitting eachother, it isn't the Rear U-Joint, just had it replaced, also my back brakes have a massive pulsation anytime you use the brakes it is highly noticeable, just wondering if it has anything to do with it, have performance shocks on it, maybe year- year and a half old, hasn't been driven hard, I am a light braker, and this is bothering me and quite embarrassing.....any help would be greatly appreciated, the Truck drives like a dream except that noise and the rear brakes...