ID a 1974-1975 Ford Dana 60 Closed Knuckle Front Axle IDN-133

1974-1975 Dana 60 Front Axles in Ford Trucks had a Ford Axle Code Tag with the Ford Production Part Number and Dana Bill of Material Number (BOM) stamped on a metal Build Tag (red arrow) attached to the differential by two of the differential cover bolts (yellow arrows) when the vehicle was shipped from the factory but, unfortunately, these tags are often missing on trucks that had prior differential service. The BOM number is a 6 digit number beginning with a 6 plus a dash number (ex: 603448-2). They can be used to determine not only the axle model, but also what components the axle was originally built with. We often ask for this number to insure we provide you with the exact parts you need for your truck. Each different BOM number signifies an engineering part change which may be minor or major and may involve one or more parts. The dash number indicates the axle ratio, differential type, and engineering changes. As built, all 1974-1975 Ford Dana 60 front axles had a 4.10 ratio gear set. An open differential was standard and Trac-Lok limited slip differential was optional.

Ford factory parts illustrations specifically show the Closed Knuckle Dana 60 axle was used on Crew Cab F-250 trucks from 1973 to 1975, however, Dana only lists production for the 1974 and 1975 model years. Since the date code on the Ford Axle Tags is a 1973 vintage number, there may have been a few 1973 model year Crew Cab trucks built.