Truck steering

It sounds to me like the one that is harder to steer appears normal to you and the other one is unusually easy. I have encountered some of those myself.
Before you do any work on the one that is harder to steer it would be good to have the pump tested with a pressure flow meter. As well as all the other things mentioned.
I will go with the Sheppard section from a Peterbilt Owner Maintenance Manual. Just hitting what seams relevant to your question because that section is 30 pages. " Steering extremely light in one or both directions - Bent of damaged reversing springs - Check for impact or accident damage - Replace damaged parts." The reversing springs are in the piston, it's internal, and not a place for the average person to go.
I believe the Ross is similar but that is a function of the control valve.
Before I read the trouble shooting guide I would have recommended swapping boxes between trucks but now I am not so sure of that. Someone like Steering Specialists in Atlanta might be able to build a box the way he wants it.
I used to own a truck and seldom ever drove it over 300 miles with no problem. Then I drove it to Minnesota and back. My shoulder was killing me. Figured out the slight amount of pull it had added up after some long hours. Never worried about it before because it had excellent tire wear. Does he have to hold the wheel all day?

 

I would be like that old man, unwilling to give up something good and known.

A power steering box will be the solution. The trucks I had prior to leaving the industry including a number of petes at auction steered really good with the so called finger all the way lock to lock no problems.

When you are 90 and all you have to deal with is a owie in shoulder I say that's pretty #### good.

 

If he is that feared of a heart attack, then he needs to hand over the wheel to someone else. AND that will kill him I expect.

If you removed the driver in any situation via heart attack etc that thing will go straight ahead in whatever direction it was given at the moment the driver died. That means straight until it runs off or hits someone or even something like a pole etc. If there is a second driver in that truck there is a way you can get it stopped and not hit anything. Basically pop the trailer and wait until it's stopped.

I would recommend that one man who worries about a heart attack go to a cardioligst. It wont take but a couple of comprehensive exams to really understand the heart, valves, blood vessals etc around it to see if there is a cause for a heart attack in his future. In fact if they find it and map it, they might be able to fix it and prevent one.

You cannot live life in fear of dying at a moment's notice. At some point we all have to go. How we go matters I think. I'll probably do it with my boots on and up to here in hot brass as it were figuratively speaking. Ive already died a thousand times in the past out there on the big road.

 

Ok I understand. Sorry about the age mixup. Usually 90's will outlive us all. God bless em.

Everyone used to tease me what will I do at 70 holding everyone up on the DC beltway? I said are you kidding? There is a whole bunch of roads around DC I would be holding up everyone else should I make it that far. Im past 50 and frankly with the run Ive had it don't bother me. Maybe I should focus on being a stubborn reprobate at 70 plus. give everyone else a hard time. lol.

 

I do not thank the steering box is normally the cause of a vehicle pulling to one side. Alignment, related angles and tires are a more common cause. A job that is no problem can be much different for a person with something like a rotater cup problem. Stop the pull.