Awesome post, I'm only sorry that I just found it now. I just bought an '02 screw 4.6l 2wd. After having the rear right seal replaced along with e-brake shoes coated with oil, I now have a vibration that starts around 25 mph but is very pronounced at 45-60mph, and also a "whoop whoop" sound in the rear. That sound doesn't change with braking or putting it in neutral, it just gets faster and slower with the speed of the truck (can't really hear it above 50 mph or so).
Is there anything they could have done wrong in this process to cause these symptoms? Coincidentally, they also replaced the pinion seal. They didn't say anything about that leak until I took the truck and noticed the leak. Maybe it was caused by the repair?
Last edited by tkdrumr; 09-02-2009 at 12:38 PM.