CV Rehab

Replacing the front axle assembly

Front-wheel-drive vehicles transfer the power from the transmission to the wheels through drive axle assemblies. These drive axles have constant-velocity (CV) joints at each end. The joints are protected by rubber boots whose purpose is to keep contaminants out and lubricant in. Cracks or tears in the boot can lead to CV joint failure, as can normal wear and tear. Signs of worn or damaged CV joints include lubricant leaks, clicking sounds during turning, clunks during acceleration or abrupt deceleration and frontend vibrations.

Repack or Replace?

Cracks or tears in the boot can lead to CV joint failure, as can normal wear and tear. Drive axle boots and CV joints can be serviced. However, the job often requires special tools. Because the drive axles must be removed to service the joints anyway, replacing the entire assembly with a rebuilt unit is worth considering. It's certainly quicker and easier than rebuilding the boots and joints. Depending on vehicle, a replacement drive axle assembly can be surprisingly affordable, and removal/replacement is entirely achievable for the average do-it-yourselfer mechanic.

The accompanying photos show a typical drive axle replacement. Some vehicles such as the one shown don't require the caliper and rotor to be removed; others do. For details on your vehicle (especially fastener torque specs), consult a service manual.