MusclePak Rear Ends:
These are complete rear ends with brakes, brake lines, e-brake adapter cables, differential, gears, etc.
Bolt-In Rear Ends:
These rear ends come with differential, gears, axle bearing, etc. No, brakes, brake lines, e-brake cables. It is up to you to adapt your brakes of choice.
Housing and Axles:
These rear ends will only be the housing and axles ONLY.