The stock ratio should be 2.56 to 1 if it is a 350-2bl. Also, you can contact John Csordas who runs the Northeast GS/GN club. He manages a shop in Pleasantville NY and may be able to help you or direct you to someone for the rear end. His club number is 845-528-GSGN(4746).<BR>Hope this helps you out,<BR>Mark