We are a dealer for the Bulldog quick change rear ends, made by DMI who makes most of the outlaw diff`s,, I have them complete with mag centers, ground axle tubes for birdcages, CNC rear cover with o-ring gasket, CNC front Bearing mount ,, come with axles, 5 on 5 hubs, all bearings for hubs, rotors, drive plates..
With the mag center they weight very close to the same as a (9 inch) complete.. $2000.00 that's with freight to my door..
These aren`t the cheapest out there, but they are one of the best !!!
Call for more info.. 707-481-7416
You can go to FACE BOOK under Carr Racing Chassis to see pictures of the Quick Change  Thanks for looking.