2012 Cascadia Power Steering pump replacement

Have a 12 cascadia DD15 replaced the steering box and still having difficulty turning the wheel when sitting still once the truck is warned up so I’m down to the power steering pump or the steering shaft. No one in the country has a shaft and I did manage to get a pump i will start there.

Found a video to change to the pump look fairly simple has anyone else had a similar problem or have any advice of things to be aware of when changing the pump?

 

Changed it Wednesday and I did use synthetic atf drives and steers like a new truck!!! Took forever to track down a pump with the nationwide parts shortage the Freightliner dealers by my house said they had pumps on back order for 2-3 months. But luckily I found one across the country.