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On an 03 Model, There is Both a Metal Tag on the Rear Diff and a Sticker in the GloveBox that tells you what Type of Diff and the Ratio you have. Not sure if the front C205 Diff has one as I did remove mine when I first changed the Fluids and stuck-em in my tool box! hope this Helps.
Thats gear size. Whether is it open diff or LSD diff you will need to check that tag or look in glove box on the door or get a build sheet that lists everything that came with your truck