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Yes it does matter so you need the other numbers off the center section to figure out if you have a 8.8" or 9.75". My Ford manual shows either could be under your truck. I know my old 2005 and current 2006 Navigators had the 9.75. Hard to tell from here what's yours is. My best guess is a 4.6L 2wd Expedition has a 8.8", but only guessing.