My truck is doing the same thing, only it lasts for a few minutes, until the fluid is warmed up. I'll have a little power assist when I turn the wheel at idle, but if I rev the engine up, all power assist goes away. After driving a few miles, everything is normal again.
I'm pretty sure it's the pump. Mine got low on PS fluid a while back, and I kept forgetting to add any. After topping it off, it made noise for about a week. I think I ruined my pump. Doh!!!
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Project truck: '81 C/20 converted to 6.2L TURBO DIESEL bored .040", gear drive, 6.5L injectors/pump, custom pistons, custom 4" exhaust, 700R4, 4.10's
Daily Driver: '95 K1500 Tahoe, 6.5L TURBO DIESEL, NP241, 4L80E, 3.42's
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