I have read many steering problems related to a bad pump, gear box, leaks and fluid related. My truck has over 80 k on it. I change the steering fluid every 10k. It does get dirty and it does get contaminants in it. I use Mopar or STP pump fluid. I have never had a leak or pump problem. To change the fluid, I use a small hand pump and pump out the reservoir. Add fresh fluid, run it till its hot then pump it out again. I do this about three times to ensure a good flush. I hope this advice will help other owners.