I got tired of the 3.9 ratio in my 59 and installed a camaro rear end in it. It was free, sitting in my Bro-in-laws yard. Came out of a late 70's/early 80 camaro. I forget the exact measurements now, but it was skinnier than the existing axle,but not by much. I cut the saddles off of it, made my own saddles out of 2 inch channel, welded them on after we determined the pinion angle.
Had to get one of those special U-joints from NAPA that is 2 differnt sizes, but it was instock,and pretty inexpensive. ($20 or less)
The ratio is 3.08, and I cant complain because the Price was right. If I had to do it over again,or if I ever get off my butt, I would like to change the ratio to 3.4. (Iam running a 305/350 turbo combo)
I have 6 lug in the front still, but a power brake conversion is in my future. (doing the power steering conversion now)
all in all,it was an easy change.
