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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
3.55's come in the new mustangs, but I am pretty sure no fox (Were are in the 5.0 section so guessing fox) came with 3.55's. Your door sticker is the easiest way if someone hasn't upgraded them already. Search the forum for a listing of the door codes for gears. 3.08's were about as big as it got for foxes with 5-speed, and 3.27's for AOD.
+1 yes 3.55's did not come stock in 5.0's (didnt catch that!) Im not positive on the whole 3.08 max for 5spd's thoug....... not sure. Highest gear in 5.0's were 3.27's.