I am not sure about a 40 Dodge truck but I just completed a rack & pinion setup on my 56 Coronet. This was an engineering nightmare and probably not worth the time or effort. Is the truck a rear steer setup (tie rods behind the axle)? If it is rear steer I can send you pics of my setup, but witnh he rear steer it was impossible to make connect the steering shaft to the box safely without using a $600 Wizard offset steering box.

Search on "Jeep steering Box" conversion. The Jeep Grand Cherokee uses a quick ratio (12.7:1) steering box that might get you where you want to be. I used a Borgeson conversion kit ( using the same delphi box in my C3 corvette and it was one of the best conversions I ever did. I have seen them used in Chevelles, C3 Corvettes ect. I could not make it fit in my 56 Dodge Coronet but the truck might be a different layout.