Still don’t know what a steering rack is or now, why I need 3?
Just a heavier duty steering box is all. There is only one in the machine, it’s what the steering wheel controls to make the wheels turn.
The only way you’d really need to be worried is if you were taking out tie rods (front steering bars) and went aftermarket heavier duty with would send any damage up the line to the steering rack.
Good idea for running long length control arm and portals as well.
With that said an upgrade is an upgrade, a good deal on one and I’d install one in mine happily lol.