Axles (also known as driveshafts) transmit torque from the transmission to the wheels. Without them, you'll go nowhere. Sometimes both of them transmit torque-like in limited-slip differential ...

The constant velocity, or CV, joint lives only as long as its grease. A blown rubber boot combined with velocity can spin grease out and let in road crud. A telltale clik-clik-clik means it’s already ...