I have a 1951 Farmall "M" with an IH, factory wide front end. My steering box seems to have some excessive free play, to the point that when I drive down the road in 5th gear, the front end shakes. My tie rods are all tight, and the play is definately in the steering box. I don't have a service manual for the tractor, just an operators manual, and it says nothing about steering adjustment. Can someone tell me if the steering gearbox can be adjusted to eliminate the free play, and if so, what is the procedure? I haven't torn into it yet, but wanted to seek some advise first. Thanks for any response!