I just ran across a 1975 Lincoln Mark IV that looks like it has the 9 inch rear end with disc brakes. Does anyone have any info on this thing. I'm looking at it for my 67 Firebird. Is it in fact a 9 inch? Will I have to narrow it? Did these come with posi? The disc brake setup is making it hard to pass up. I know the Lincoln Versailles rear end is good to go, but I have not heard much about these. Thanks
