I have a 4,000mi PSC Type II pump that I cannot seem to get the whine out of. It's not quite in a 4x4 but you all know steering systems much better than anyone else I know to reach out to. I've put up with the whine for awhile, the last two people that rode in my car both commented on it.
Problem: I get a low whine out of the pump with any steering input, hot, cold, whatever. It does not make any noise with just rpm, adding steering load creates the whine.
Attempts to fix:
- Bleed, bleed, bleed - No improvement. Same whine for 4,000mi
- Installed a cooler to ensure temps stay resonable
- This P/S Pump
- Borgeson Steering Box [5,000mi on it]
- AC Delco Brand P/S Fluid
Should I consider using the super-fancy Swepco fluid
Any and all ideas are welcome.