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Ford Explorer Community - Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street
Explorer Forum Covers the Explorer ST, Explorer Sport, Explorer Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
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.