I eliminated the master cylinder. I just went ahead and replaced it for grins.

I'm beginning to think it's in the proportioning valve. After the truck sat for two days while I rebuilt the steering box, the wheels freed up.

After I drove it to test the steering box, I came back and the wheels were stiff again. I released a bleed valve and the wheel freed up.

I noticed that the wires had been disconnected from the valve I suppose to turn the warning light off.

Like someone said earlier, I'll just keep moving down the line until I find it.

I need to check brake booster as someone suggested also. I replaced it sometime last year because it was leaking. I also need to check the flex lines too.

I have to find it soon, there isn't much left.:P