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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
If you look on your differentials, they will say what they are (or at least mine does). Should also be on the window sticker and MAYBE on the sticker in the glovebox.
i didnt think any 3rd gens ever had 3.73s. im pretty sure it was either 3.55 or 3.92. if you have 4x4 you would most likely have 3.92s. they put 4.56 gears in the powerwagon and i think they have an option for 4.10 gears in the heavy duty trucks for towing. not sure about that one though.