Center axle disconnect

Like locking hubs, the CAD system is designed to improve fuel efficiency of the vehicle.

Other, often debated, benefits of CAD systems are reduced vibration, axle wear, and noise, as well as improved steering and drivability.

Unlike locking hubs, CAD systems are generally automatic and engaged when the vehicle is placed in four wheel drive.

Rotting of vacuum lines will cause the four wheel drive system to fail — damage that would not be an issue with locking hubs.

Ram 2013 model year trucks began using a CAD system again, this time electronically controlled instead of vacuum.

Center axle disconnect on a Dana 60 , in a 1999 4x4 Dodge 2500HD