I just test drove a 94 SLC and found an odd noise when speeding up. At a stand still the noise isn't present, but by 30mph both the engine and exhaust noise are drowned out by a very loud humming. Increasing speed up to 70-80 it gets louder/higher pitched. It seems to be completely dependent on car speed, not engine RPM, so I decided it must be something in the drivetrain. Has anyone had any experience with this?
Any help would be great! Other than this and some cosmetic issues, this car is perfect for me!