AC/PS Gear assy

I had to replace my ac shaft after the spline end striped. It made one of the worst noises I think I ever heard a car make. I replaced it and my downpipes at the same time. I heard a slight grinding and knocking sound when I took it for a test drive after I finished all the work. Slightly similar to the original sound but a little different. I thought that possibly something exhaust related was rubbing. After readjusting everything 5 mins later the sound and feel came back. I still have ac though so thats strange. I’m guessing that the gears on the power takeoff assy are fucked. If so does anyone know the part # for it?