Join Date: Aug 2005
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Poor Return to Center / Power Steering Conversion
More positive caster puts the thick part of the shim towards the front, tilting the king pins back and the front axle pinion down. It is likely the king pin inclination is what helps the return to center the most and I can't do much about that.
I reduced the steering shaft bushing friction down to nearly nothing, so some improvements have been noted. Taking out the dampner helps a bit too, but I prefer the feel of it in place.
My return to center is now useable but maybe I'm comparing too much to modern vehicles, which have a strong return to center. I suspect the manual steering box had less internal friction and returned to center more easily than the power steering box.
The 18:1 box ratio and big steering wheel seems to be very over assisted, but this is how power steering was in 1968 apparently. I think I will try to find a lower ratio box eventually for a more modern steering feel.