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I tried a full flush with the cold-climate ACDelco fluid after a pump replacement last month. No difference.

Interesting! Every 3800 pump I've ever had, including the one on my Regal now, whines. I'll have to try that stuff.

Ive had some luck with the Lucas P/S fluid and conditioner. But whatever you add to the reservoir is only going to mix with the old fluid in the lines and R&P, perhaps a complete bleed and fluid replacement might help? I have this planned as I put the Vert back together and going to use nothing but the Lucas stuff. If it still whines after that well the pillar mounted door handles, leaky oil pump shafts and LIM gaskets are notoriously W-Body, so to shall be the b!@#$ing of the P/S pump.

Put the original pump back in and it is quite a bit quieter now, even more so than before. Of course, a 30 minute job turned into a multi hour endeavor, with dropped tools, spilled power steering fluid all over, and a lost o-ring. I'll return this AC Delco one, drive it for a bit, and see what happens.

Well, it won't be the seals that are causing the whine, it could be the vanes as they spin inside the pump ring, or possibly the control valve is fluttering against the flow control spring.