3.27 came from the factory from all 99 and up v8's. The 03 cobra is the only one i know of to have factory 3.55's. The tag on the rear cover has a code which will tell you what gear it came from the factory with. I dont know the codes but i am sure someone else on this board does. Why not just buy a brand new 3.55 from Ford? They are only 175$, and would cost about 175-250$ to be installed.
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