power steering whine in brand new power steering pump 2002 toyota tundra

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i just switched out a power steering pump because the old one started leaking between the pullley and the pump and the new pump still made a bit of noise (whine). i later noticed a leak on a seal between the steering rack pinion and the steering column so i decided to add an addative (at-250 if i recall) and it worked great (no leaks) for a few days until the rebuilt pump i bought started leaking at the same spot. so i sent it back for defects and got a new one. just installed it, fluid level is good, spent 20 minutes turning lock to lock, drivfing around etc.. and it still makes a bit of noise. i cant figure out why