Just on the slight chance....I'm looking for a rebuilt, 1 1/2" total narrowed '57 differential that is is set up for disc brakes, trac-loc, 3.56 or 3.50 gears, extended yoke.
Rich I have an 8.8 I'm going to use and I will shorten the 8.8 and sell the 9" it is an open diff 3.7 something like that (i know this is not what you need). But I think you will need a 9" 2' shorter if you have disk brakes as I understand the disks will add about a 1/4 inch each side.
What you have is the same as what I have now. I figured with my luck, as soon as I have the work done on mine, one will show up exactly what I needed.