Honestly, I need to find someone who has a factory dart with a 8.75 and find out exactly where the factory centerline is. Nice part is, I can adjust the axle forward or backwards with the links slightly but I want to start with every at factory specs. I've debated moving the axle back an inch or so to give me even more clearance for the bigger tires . Which since I have to have a custom driveshaft cut anyway, isnt a big deal