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They didn't cut any sheetmetal to mount the steering box, so I guess they could have gone further forward.



That seems to be the trick to getting the draglink and tierod to clear each other when using the All-pro/marlin style arms and rear springs up front (or building a custom front x-member that moves the axle forward 2+"). Cutting into the core support by the radiator gives you that little extra bit of room to move the box forward and rotate it so that the two rods just clear each other on compression.