I have 04 ram 1500 (4WD) Hemi (93,300 mile).. The power steering pump started grinding a few weeks ago. The system has never had a leak and never has been low of PS fluid. The grind does not get worse when you turn the wheel, but it does get worse with RPM. The steering works perfectly other than the noise. I replace the PS pump and resivour last weekend, but it did NOT correct the grinding. Sounds exactly the same. Does anyone know if the rack anf pinion or hose can cause these to grind?? I've never seen this before and hate to throw anymore $$ at it until I have an idea what's causing the problem.