You may have broken one, you may have sheared splines, you may have bent it. Whatever the reason, here’s how to change your driveshafts on your vehicle
How to change your driveshaft
Replacing your driveshaft
Watch this video to see how it's done. Find the full step-by-step task for your model.
A very brief summary of the task:
- Remove the split pin from the hub nut, then crack the hub nut off so that it’s loose, but leave it attached.
- Jack the car up, remove the front wheels and take off the brake calipers. Remove the hub nut completely.
- Undo the nut onto the lower ball joint and break the hub assembly and the lower arm apart. Pull the hub away from the driveshaft, freeing the outermost end.
- Remove the driveshaft end from the gearbox.
- Fit the new driveshaft. Make sure you tighten the hub nuts up to the manufacturer's specified torque.
How long does a driveshaft last for?
The driveshafts of your car are exceptionally important, given that they take the power from the engine and send it to your wheels. Despite their importance though, they’re not a service part, and this means there is no set interval for when they should be changed. Every car is different. The key to driveshaft longevity is preventative maintenance as well as just generally looking after them.
If you look after your driveshafts, they can last the lifetime of the car. It only if you ignore the information below that they can become a problem.
The main shaft of the driveshaft unit is just a bar of metal, and as such is pretty robust. The only way this bit fails is if it’s damaged, or if the rust is allowed to eat it away. As such, there is no harm in getting under your car with a wire brush, clean up the shaft and give it a new coat of rustproof paint. This will extend the life no end.
Other than that, there are two main points of failure, they are:
The splined ends
Each end of the driveshaft has a splined input piece. It is these splines that allow the driveshaft to be acted upon by the gearbox, while at the other end, they allow the shaft to act on the wheel/hub, thus delivering power.
If these splines are damaged, the shaft can start to break up and shift, meaning the power isn’t delivered. In situ, these spines are pretty hardy.
However, if the car is driven hard, this can damage them. Also, if the car is modified to produce more power, it can be too much for the stock splines and can strip them from the shaft.
The most common issue is at the hub/wheel end. If the car has to have any work done that involves taking the hub off, so suspension work, a new wheel bearing, that kind of thing, if the hub isn’t fitted correctly, it can damage the splines.
The CV joint
Driveshafts have a constant velocity joint at either end to allow the shaft to move with the suspension and steering of the car. These joints are packed with grease to keep them happy.
To keep all that grease in place, you have a CV boot, a rubber cover that flexes with the movement of the shaft. If this cover splits or comes adrift, dirt can get into the grease.
When that happens, the dirt grinds against the metal of the joint, eventually breaking it. If you get a CV boot advisory on your MOT, do not put it off. The £10 a new boot costs is a small price to pay when you consider that new driveshafts are hundreds of pounds to replace.