jimigunne
Veteran Member
Its a 2006 Jetta tdi, 255k miles. I got it at 190k, I doubt that any suspension parts have ever been replaced. The car is vibrating a lot above about 50 mph. I hear the sound of a tire not rolling evenly, but all 4 tires are good when checked on balancong machine that simulates actual road condition/ car load, etc. The tire store guy says the rear tires are cupping. He said every fourth groove or so is flattening or cupping. Rims are new and perfect. All four wheels were just balanced. So i think there is a suspension issue causing the rear cupping. There is no noise other than that tire slapping sound....no rattles, nothing. When i push down on either the front or the rear, there is only one bounce. Can it be caused solely by a bad rear shock, or would it be some other suspension part? If it has bad rear shocks, wouldnt it fail the "bounce test" i tried?