If you have the 2-tooth box,then rebuild & modify it & it will steer very easily.On my A,s I installed needle sector brg,s & had inside end of sector hsg cut back 0.140" for needle thrust brg to replace brass washer. Thrust brg-INA #TC1828 & thrust washer INA # TWC1828.For oil seal use C/R 11124 or C/R 11061.Bore sector hsg to 1.624 X.250 deep.I also used a short pitman arm & teflon ball seats on new steering balls.It steers so easy that I wouldnt even think of useing an F-100 steering box & it looks original.