I picked up an axle on trade. It was said to be a F-1 axle. BUT - - - It has a modern FORD bolt pattern 5 on 4.50" 2 spring perches. Year unknown. Has Bendix type brakes. 30" pad to pad on center, 50" on center at spindles, 59" wheelbase. Maybe it's an Econoline? How do I get to a 5 on 5.5 bolt pattern from here? Can I switch drums with something?