Steering problem
1966 Chevy Truck 6 cyl Two Wheel Drive Manual 198000 miles
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On My 66 chevy truck I have had it converted to power from a 70 model nova power steering system, the truck now turns way to fast from left to right, like driveing on ice, no playin steering wheel, the front end wants to cut left at the slightest turn of the wheel it also does this when slightly turning right, dangerous at high speeds what do I do?

Where there any suspension components replaced?
If not look on top of steering gear box and you will see a nut with a screw in the center. Loosen the nut and back the screw out a turn or so . This should put some play in the wheel.
Let me know
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All of the front end steering and supension is new, I have adjusted the the screw that slacks the wheel and this has done nothing to help the problem, is ther an adjustment on the pump itself or the box other than the slack adjustment screw, i read something about a spool valve adjustment what is that and were is it located. Thank you for you help

You mave have a problem with steering inclination when you changed parts. What alignment values did you use?If caster is to positive steering will react in that way.