For starters, it has 2:75 gear ratio. From this site http://www.fordification.com/tech/rearends_ford02.htm
you will see it's a 9 inch 1968 Ford Mercury Pass rear, non locking with 28 splines. The other numbers indicate date and plant where built.
You would probably have better luck posting on HAMB, http://www.jalopyjournal.com/forum/
Charlie Stephens
Thank you both for a reply, I hope to use it in my 40 p/u build and will have to change the gears . Not sure what now. Well see.
Be sure to measure the wheel mounting surface to wheel mounting surface distance of your stock 40 rear and see if that new found Ford rear is too wide. The WMS to WMS on a 40 Ford car is 59 1/2 in.