I've been pursuing an answer to the same problem on my '59 Apache solid-axle P/U with drag-link steering. I currently have two potential solutions. 1) Use a C-3 Corvette power ram set-up with the valve/sensor hooked to the pitman arm and running to the driver's side spindle replacing the old drag-link. The hydraulic tubes would run to the power ram, which would run from the frame to the center of the cross-linkage. 2) I discovered that the '78 Dodge truck P.S. came in regular rotation and reverse-rotation. If one took a reverse-rotation box (like a Cardone 277515) and turned it 90 degrees such that the pitman shaft ran through the frame rail like the original box (at least on mine), then it would function as a drag-link box with the pitman arm hanging downward. This would require fabbing up a new mounting plate running at right-angles to the frame rail, but if you're handy it could work well. To turn right (at least on mine), the drag-link has to move to the rear, which would be counter-clockwise rotation of the pitman shaft. Good luck!
Apache Kid
