I run a Durango gear box, pulled from the wrecking yard, my pump is a stock xj rebuild from Autozone. 33 inch tires, many 100s of miles rock crawling, 1000's of miles of highway use. no problems. A whine is usually bad, and maybe a sign of air being pumped, which can ruin the pump and gearbox. It was for me...
one thing I did wrong at first was install a steering cooler, the problem with that is I placed it too high up on the radiator, such that part of the cooler was higher than the fluid reservoir fill level. This made getting all the air out of the system not possible, so dispite lots of air bleeding, till I got almost no air bubbles, she whined and had a short life. I had to replaced both pump and gear box as fluid was full of metal, flushed everything and moved cooler down to near bottom of radiator, well below the reservoir level.
The difference was huge, the air purged quickly, and she was silent.
So the Autozone cheapo rebuild pump is working fine for me. And always install the cooler and or inline filter, BELOW the reservoir level!
I also run an inline filter made for steering, when my pump died, the filter worked hard, I cut it open, the filter media was crushed with metal bits, and the magnet inside was also covered, this filter has a bypass valve, so it kept flowing after the filter itself clogged. Good design inline filter I run one on steering, another on transmission.
https://magnefinefilters.com/
good luck