Hey,, Loud rumbuling noise under my truck, i think is the rear differential. on 1998 Ford Expedition

My rear diffe. Was leaking but today while coming out the highway i heard a loud rumbling noise under the truck, when i press the gas on neutral theres no problem but when the truck starts moving it sounds like im dragging a piece of metal under. Can anyone tell me what the problem might be and whats like the price range to fix it? Thanks.

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3 answers
Did you add any lube or just run it dry? Special gear lube required!!!
Before you jump to to conclusions have the fluids cheked and vechicle cheked on a lift you may want to tow it to avoid any more damage fred hunts point auto should cost no more than fortynine dollars to check that
718-991-8808
did you run it dry.get an insp before anything else