cross over steering on the cheap??

[texas69truck]

I remember reading awhile back about a cheap disc brake conversion using a later model upper control arm?? For some reason i keep thinking it is from a 4wheel drive truck. Im not to sure and way to tired to try and research more but heres my question. IF* the parts needed to convert to disc is from a 4x4 then could you take the steering system off the donor truck and put it on ours? or do they not come with cross over steering? Sorry for all the stupid questions, im sure if i hadnt been up all night cramming for an exam this post might be a lil bit more intelligent...maybe
Thanks, Travis