I have a 96 GMC sonoma four pot auto, the problem is the steering is very stiff, when I go round a curve and let go of the wheel it doesn't move back to center. I have replaced everything from the steering box to the wheels...could this be a steering box problem (it is ajusted right, done by the garage), or could it be the power steering, like having air in it or old fluid? (no leaks of strange noises and seems to be ok)
I'm running of of things to look for (and money).
ps the truck only has 78,000 on it.