Investigating because I feel a vibration almost like wheel balance issue intermittently at 70 mph or so. I checked the u joints for axial play and I cannot feel any. There is no grease on the outside of the u joint, and there is no fluid coming from the diff seal. Yet there is grease on the side of the gas tank in line with the u joint or front diff seal. I tried to upload a pic but it's not working. It is a good amount of greasy residue up and down the side of the gas tank. Edit. It is a 99 Tahoe 4x4. Also should mention that I recently had tires rotated and balanced as per my warranty at Costco. I don't think it affected the feel.
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