66 ford f350 rear end
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You might want to try asking in the "Transmission, Differential, Axle and Transfer case forum or the 1961-1966 Ford Trucks forum here. Not saying that somebody here in Ohio wouldn't know, it's just that those forums are geared specifically for the part and year of truck you're dealing with. Probably bring better results. Good luck and welcome to Ford Truck Enthusiasts. Hope you enjoy all the wonders this site has to offer!
Bruin52
Bruin52