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open up your glove box and at the back of it there should be a sticker telling you this info. if it is not there then you can goto www.allpar.com and type in your vin number and it will give you the info also
mine is a 9" corporate 3.55 LSD, if i remember correctly. There are 8.25", full slip, and 3.92, but iknow not what combinations are available. You cannot get a 3.92 : 1 rear or a HO engine w/ a manual.