I agree with everything Bret said & add one clarification.
In most cases ... most ... you can't just install a rack & pinion into a car designed for a steering box ... and have it come out correctly. Usually, the frame & crossmember design won't allow putting the rack where it needs to go.
So just installing the rack "wherever it fits" usually leads to incorrect steering tendencies. Which leads me to ask why we're doing it in the first place.
I love utilizing rack & pinions in my "clean sheet" front suspension designs. But the only real advantage they offer over a
modern steering box system is lighter weight.
Is your goal to save some weight ... or improve your car's steering traits? If it is steering you want to improve, post up specific goals & I may have some suggestions.
