[dsraven]

part of the problem is that the leaf springs move upward and would normally have a jounce stop or snubber on the frame above the axle just in case of a big bump or whatever. so, that sort of eliminates a box on the inside of the frame with the pitman arm swinging across the contact area above the spring. the stock box exited on the outside of the frame probably in part, for that reason. since you dont have room inside the frame to mount a box with a side outlet like the stock box you may have to look at something like the scout box, mounted on the outside of the frame but with a long output shaft area to keep the gear box section sitting high. the problem with doing that will be that the pitman arm will protrude sideways, towards the tire, and swing in an arc on a horizontal plane instead of a vertical plane like the stock box did. that means the drag link end that attaches will go through some large angle changes as the suspension moves instead of the simple turning motion that a vertical pitman arm would. a box with a vertical pitman arm, like stock, would be best. I have seen an AD truck with the stock box offset towards the outside of the frame, is something like that possible maybe using the power steering option from a toyota so the pitman arm stays vertical? offset the engine to the passenger side a little?