@Spook50 , there was a big discussion on the differences between 60 and 80 steering boxes on here somewhere. The 80 series box has a larger power piston, meaning it can provide more steering assist by itself. I don't think there has been a reported issue with stock trucks, but put 37s or larger on an 80 and take them wheeling and you may twist the splines on the sector shaft. The fix (or preventative measure) for that is the 105 series sector shaft, installed in the 80 series steering box.
The late 60 series steering box shares a mounting pattern with the 80 series box. The 60 series box also appears to have the same (or very similar) sector shaft as the 80 series steering box, as an 80 pitman arm can be ran on a 60 box, but the 60 box has no reported issues with twisting sector shafts. This is likely due to the smaller power piston in the 60 series box.
Clear as mud?
Long story short, if your late 60 series steering box goes out, put in an 80 series steering box.
The late 60 series steering box shares a mounting pattern with the 80 series box. The 60 series box also appears to have the same (or very similar) sector shaft as the 80 series steering box, as an 80 pitman arm can be ran on a 60 box, but the 60 box has no reported issues with twisting sector shafts. This is likely due to the smaller power piston in the 60 series box.
Clear as mud?
Long story short, if your late 60 series steering box goes out, put in an 80 series steering box.
