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Pop your hood and look either under the hood or on the radiator support. There is a tag there that has all the info you need as far as axles, gear ratios, engine size, tranny, paint codes, model and trim, etc. It's not even in a code form, it spells out exactly what you have. IE: Chrysler 9.25" axle 3.55:1 ratio. Plain and easy to understand.