I have a weird noise coming from what seems to be the front of the 80. I have the J springs and 1.5" spacers in the front. The noise occurs while driving down hill at 55+ with my foot barely on the accelerator, just at the point where there is no load on the driveterrain. It sounds like air passing over the end of a tube. I can feel the vibration in my feet more than I can hear it. Is this a common noise/problem related to bad birfields? I tried removing the front driveshaft, this reduced the noise only slightly.