the vin must be 17 characters long, I think you missed one.
it is roaring sound like limited clutches slipping. I have been informed by other owners of expeditions they had axle bearing prombles. There is no noise when your are going straight.
The noise is coming from the rear. I drove the suv and turned the wheel in both directions and there was no roaring sound. The sound is only present when you make a 90 degree turn to the right from a dead stop and you take off fairly hard.
ok, the clutches in the rear axle need to be replaced. here is the tsb and parts list.
This article supersedes TSB 06-02-16 to update the Service Procedure.
Some 2003-2004 Expedition, 2003 Navigator, 2004 F-150 vehicles equipped with a 9.75" or 8.8" limited slip rear axle, and 2002-2004 Explorer 4dr, Mountaineer, and Mustang vehicles equipped with 8.8" limited slip rear axle, may exhibit a chatter, shudder, a binding sensation, or a vibration during low speed turns. On 4X4 vehicles, the sensation may appear to be originating from the front axle or the steering gear.
First verify the condition. On 4X4 trucks ensure that the vehicle is in 2WD, to isolate the rear axle. On all vehicles, turn the wheel fully right (or fully left) and then accelerate the vehicle. If the condition is verified to be in the rear axle, replace the limited slip clutch pack.
Order and install the appropriate clutch pack, follow the instructions detailed in the Workshop Manual.