hello, i have a 2004 edge with the 4.0 auto tranny. i am having a weird rattle ONLY during acceleration while the tranny is in like 3-4+overdrive. it sounds like something is just rattling around and its not very loud. so if i am going 40 and i am going up a hill and give it some gas and the rpm's are at 2000 to 2500 it make the rattle until it downshifts or i let off the gas. any ideas on what it could be?

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2004 black ranger extended cab flareside 4x4 4.0L
32" BFgoodrich all terrain t/a ko tires