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What is a CAD unit and do I have a CAD unit?The C in CAD doesn't stand for a computer, but Center Axle Disconnect (CAD). If I were the engineer who came up with the name, it would've been SETB. That's short for Something Else To Break. CAD is a way for your rig to engage in four-wheel drive without the use of locking hubs. I'm going to go over how to tell if you have a CAD and what your options are if you have one. The great thing about CAD axles is they're simpler than working on a computer.A C …