j98

I've got a 2011 GMC Sierra Denali that ever since I've purchased it its been difficult to turn. I put in a brand new AC Delco pump, and it helped slightly, but its still noticeably harder then I think it should be. Cold or hot, it remains about the same Is there any way to test for pressure or is there any sort of adjustment that can be made on the steering box itself, or do I just have a bad rack? Thanks for any ideas!