I am converting a 2004 suburban from 2wd to 4wd. And yes I'm actually serious about it. I have drawn everything out and located all the parts, the one thing i can't figure out is the steering. Do the 4wds require rack and pinion or are just some like that? Will the diff fit under the front without interfering with the current steering set up? And if I have to change to rack and pinion will it be difficult?