1998 Exp roaring noise from Differential / Transmission
I recently purchased a 1998 Expedition XLT 4x4. After getting on the interstate I noticed that there is a roaring sound coming from either the differential or the trans. It only does it between 35-65 mph and only while accelerating. I took it to a shop and had new brakes, rotors, front end alignment, etc done. They guy at the shop said it could possibly be a pinion bearing in the rear end. It is hard to tell where the sound is coming from while driving. Has anyone had this problem or heard of anyone else that has.