Ok so I have a 2000 Chevy blazer and I recently redid the front end (upper and lower ball joints inner and outer tirods front break pads and hub assembly) I noticed that after going down a steep hill that I get a metallic grinding sound I believe it may be coming from the rear but I could be wrong any way after I go down the hill the sound remains especially if I turn left if I move the wheel right it stops. Here's what baffles me after I shut it off the sound goes away until I go down hill again. I know it's weird but it's true HELP