Urethane or solid mounts

YES! Having urethane or solid mounts of any kind at any location on the vehicle will transmit noise, Urethane or solid mounts can be benificial to tighten up a suspension for better performance but the down side is the noise when driven on the street.... especially in an otherwise quiet vehicle. Urethane or solid engine mounts, transmission mounts, body mounts or control arm bushings will transmit more mechanical noise and road noise throughout the chassis and interior of the vehicle. You will hear and feel these noises much more than if you had rubber mounts. Nothing dampens noises better than rubber. Depending on where the noise is coming from it can be described as a buzzing sound or a droning sound with a rythmic oscillation. You will hear every moving part in your entire vehicle including road noise. Some people are ok with this and some people will go crazy because it is not always pleasant. For racing it's ideal...for street it's annoying. If you ever had a vehicle that had an exhaust pipe or clamp come in contact with the floor or frame then you know how much noise can be transmitted. Now think of this mulitiplied by many times. Typically the driveshaft is usually not the cause, unless it is out of balance, but even a perfectly balanced driveshaft can act as the "speaker" which can amplify and transmit the mechanical noise or road noise.