Rebuilding a '54 1300 Chevy pick up and I need to find a rear end and drive shaft but not sure what to look or what specs to request when asking a scrap yard. I've heard the thread width should be 60 inch. Does this mean it can't be 59 or 60-1/2"? I'm putting a 350 SBC with an automatic transmission? Not sure if it matters but i thought I'd give you all as much info as I can. Please help me with my quest and thank you in advance.