Can you drive with a broken CV axle?

It may be possible to drive for a short period with a CV axle that is going bad. Initial damage to the component often results from dirt or other contaminants entering the CV joint boots and wearing away at the joint. Over time, the component will show greater signs of damage and will eventually fail completely. It is difficult to know at what point that will happen. Since the CV axle is the only part that transmits power from your engine and transmission to the wheels, if it fails, you may be left stranded.

Should I replace both CV axles or just one?

The problems that typically arise with CV axles are related to damage or deterioration to the protective boots that cover the CV joints. The boots are filled with grease that lubricates the joints, and they keep out dirt and debris that can reduce the lifespan of the axles. If a boot becomes damaged by a foreign object on the road or other unusual event, you might get away with replacing only the damaged component. However, if the boots are getting old with high miles, it is likely that both (or all) axles will need to be replaced.

What is the difference between a CV joint and a CV axle?

A CV, or “Constant Velocity”, joint is part of a CV axle. Actually, there is a CV joint at each end of the axle, one on the inside that connects to the transmission/transaxle (or the differential), and the other that connects to the wheel hub. Each joint is capable of moving up, down, in, and out while maintaining continuous rotational movement. Having a CV joint at the end of each CV axle allows the wheels to keep turning under power while the steering and suspension moves in multiple directions.