Hello, I have 2001 Mustang stock. 60,000 miles runs perfect but recently I've been hearing some knocking sounds whenever iam driving over bumps at speeds of 10-15mph ONLY. By bumps i dont mean pot holes or any dips. Its whenever Iam stuck in traffic in the freeway and drivin over those horizantal lines that cause your car to go up and down, especially the truck lanes have it. thats the only time i hear a rough sound of something coming together. is this the first sign of the shocks having problems or something else. Thank you all!