Diagnosis starts with a visual inspection and test drive. If symptoms point to a faulty front axle, the axle will be inspected for damage, and the CV axles will be replaced. If the visual inspection revealed torn CV boots, but no damage is evident to the CV gears, the CV boot may be replaced.
For straight axles, the wheels may be turned by hand before removing the axle for inspection. The bearing and axle will be examined, and if damage is present where the axle meets the bearing, they must both be replaced.
A warped straight axle is diagnosed using a straight edge, and can be evident from wear patterns.
How is a front axle replaced?
For CV axles, the wheel, axle nut or axle bolt, brake caliper, brake caliper mounting bracket, and brake rotor must be removed. Then, the most advantageous suspension component is disconnected from the steering knuckle to allow the CV axle to slide free from the bearing and hub assembly. The CV axle is then removed from the transmission or differential, and the new shaft will be installed in the reverse order.
For straight axles, removal of all the same components is necessary, with the addition of the differential cover. This cover must be removed to disconnect the drive axle from the differential. The differential will be cleaned, inspected and resealed when the new axles are installed.
RepairPal recommendations for front axle issues
We recommend following the manufacturer's maintenance schedule. Changing the differential oil for straight axles is the single most important maintenance task for this part, and the most often overlooked.
What to look out for when dealing with front axle issues
For both types of front axle, the amount of free-play in the wheel can be an indicator of a failed wheel bearing, which may cause damage to the axle if the vehicle is driven.
Can I replace the front axle myself?
This job should be left to a professional. The vehicle must be lifted, suspension parts must be dismantled, and a lot of labor is involved.
