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The axle has a 3.50 ratio with an open differential. '78 F150's came with Dana 44 high-pinion front axles (reverse-cut gears) with disc brakes, open knuckles and ball joints. You can look up the 610048-1 Bill of Materials number on the Dana website: www2.dana.com/expert, in the light axle section. You need to download the .pdf file for '79-down trucks axle applications and you can find out where that axle came from if it is not the original one.
There is the link pasted from my browser url window. Go to section X510-8 'axle applications- model years 1967-78. The .pdf file will download if you have the Acrobat reader. Then choose the Ford front axle section.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.