first off let me tell you what im driving. 1966 f-100 with 6inch skyjacker with 35's. i have search all over for answers but they is never a answer for my situation. i need to know what year of power steering box would bolt onto my truck.the box's on the 66 sit on the outside of the frame. could somebody please help me the rock crawling tends to get a little crazy with armstrong steering

 

the box on the 77-79 F150 also fit on the outside of the frame, so I would assume that is the one you would want

 

The late 70's 1/2 ton and Bronco power box would be the best choice, but it won't be a direct bolt on. Go back into the threads in this forum, there was someone else with a 74 that had the same issue. It wasn't too long ago, so you shouldnt have to go back too far.