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Those beams are for an '80s truck, which uses ball joints. They will NOT fit the '70s trucks. Just get the front beams from DJM, which are the part number that I linked above (DB3004-3).
Also, the rear axle flip kit from DJM is a joke. That's what I put on my truck, but the brackets push on the bottom of the factory spring perches, and a little bit of torque (like from a mild 460) will cause the axle to twist and bend the spring perches and break the welds (ask me how I know). Just order new spring perches from Summit and weld them on the bottom of the axle (cheaper than the DJM flip kit).
Here's my lowered F-250. Drop beams in the front and shackles and hangers in the rear. Still running the F-250 spindles/brakes. Rides like a stock truck and hauls good too.
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.