I'm working on installing my new pitman arm on my 69 Dart. I'm using 73 Duster steering linkage and my car's original power steering box. Per things I've read, because the 69 power steering box shaft is smaller than the 73-up shaft, I had to get a 73-up manual steering pitman arm to fit both the 69 box shaft and the 73 center link which I did (Mevotech brand). My service manual says the torque spec is 120 ft. lbs. on the nut. So. I have it torqued to that but the nut doesn't look to me like it is on far enough. It is basically flush with the end of the shaft. I looked on my 70 Dart to compare and the shaft on it sticks out beyond the nut about 1/4". Your thoughts please.