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Performance Upgrades - Maintenance - Modifications - Problem Solving - Off-Road - Street Trucks. Covering the Explorer, ST, Sport, Lincoln Aviator, Sport Trac, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Aerostar. Featuring H.I. - Human Intelligence.
A quick search turned up this: http://www.explorerforum.com/ntrprize/Axle.htm
EDIT: Not sure whether you were asking where to find the codes on the truck, or were to find the codes to know what ratio you have. If it's the first, then look on the driver's door jamb.