I have a 2011 Mustang Gt, had this shop install steeda stop the hop kit ( includes lower rear control arm, and upper adjustable control arm), also did front lower control arm from steeda. Car now vibrates when I let off the gas, it’s fine when I’m on it. Took it back to the shop they said everything was fine. I was thinking maybe the pinion angle might be off or something, but the shop owner said it was fine that my car is so low I can barely get any adjustment. Well I left that shop went to...

Vibration when letting go off gas pedal