As once proud & uncontested US car manufacturers are heading for sure collapse, one can find some solace in this excellent book, way back from the years of yore .
As it could've been only done back in beginning of century, they disected everything a gear head would want to know about how they manage to mass produce the cars before CNC (and 1 cent/hr labor, in 1915 US$) were discovered.
In the first page they also mention how Ford voluntarily, w/o being ever asked for it, unilaterally reduced workday from 9 to 8 hrs and increased pay to his workers. Sent quite a shockwave throughout the world.
Free, at Google Books. You can DL it as PDF too, for off-line perusing.