My power steering pump on my 99 Dakota started making noise yesterday. A rattling sound when the engine is running. Kind of like a bearing or something going out. Its making the noise, but the pulley is still solid and doesn't have any play in it, the power steering still works fine.

I was planning on making a 100 mile trip, so would it be safe to drive it or should I not risk it breaking down on me? The shops I called were all filled up today, and I don't have all the tools to fix it myself.