Steering gear boxes

[68c10airstream]

If anybody really wants to get a certain road feel ( effort to turn the steering wheel) i would take a fish scale and attach it to the steering wheel and pull on it through the turn and record the value. This is the end result of tire size, tire pressure, pump pressure through the EXISTING SPOOL VALVE, steering wheel diameter, etc. Drive a late model what ever that has the correct feel and take a fish scale and record it to get the value. Now here is the touch part; send your existing gear box to someone (good luck) that will take your old box apart, look at the letter code on the spool valve and change it to what value spool valve you need to get your end results you want. This is all accomplished by the diameter of the spool valve in the center area as it's machined a little thinner in this area for a prescribed road feel. This info is all from my memory from the 70's but have never seen this info in it's completeness down to the nitty gritty details. The letter code stamped on the outside of the box correlates to this spool valve spec. I wish you all the best of luck with this new info i just put into your gray matter.