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depends if you have a earlier 77 "highboy" (divorced transfercase) the rear frame is narrower than the late 77 (married tranfercase) the 2wd all had the wider frame
'73-'77 1/2 F-250 4x4's and all F-350 4x2's all had a straight 34 inch frame, therefore the bolt pattern in the bed is narrower. All other trucks had a "flaired" frame with a 38 inch width frame under the bed/box.
So, if your '77 4x4 is a 150 or a later non "high boy", yes they will swap without mods, if it's an early 250 "high boy", then it is not a direct bolt in, but it can be made to work.
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.
