My 94 xlt 4x4 has been steering funny. when turning it feels like i have to push past a stiff spot and then it cuts harder once past the stiff spot. it also likes to hold a certain steering angle when i let go in a turn. however when i put the wheel straight at speed and let go of the wheel it still heads straight. i know that the truck has new steering linkage and steering box replaced not too long ago but i cant think of what else could cause the problem. radius arm busings? ball joints? any info on proper diagnosis or possible causes would be greatly appreciated.