6 Symptoms of a Bad Driveshaft
Driveshafts are the vital connection between the engine and the wheels. Without them, your car simply won’t move. Driveshaft problems are rare, but they can happen. Learn how a driveshaft works, how to identify the symptoms of a driveshaft failure, and how much it costs to replace a broken driveshaft.
How a Driveshaft Works
The driveshaft makes any car move by connecting the rear differential to the car’s engine and transmission. This is a mechanical part in the form of a tube or cylinder that allows the transmission to drive the differential. This is what drives the rear wheels of a standard car.
The driveshaft is long because it runs from the front gearbox to the rear differential. To improve the flexibility of the driveshaft, we have universal joints on both ends of the driveshaft. This allows the driveshaft to bend slightly when driving over bumps, potholes, and other road irregularities.
Without this driveshaft, no power would be transmitted to the rear wheels. However, rest assured that unless you are involved in a serious accident, your driveshaft will not fail anytime soon. It tends to wear out slowly over time, so riders can notice the symptoms of a failing shaft early on.
However, you need to be able to recognize these symptoms to take action and replace your driveshaft. Otherwise, your car could be severely damaged or you could have a serious accident.
6 Most Common Symptoms of a Faulty Driveshaft
Your vehicle needs a working driveshaft to run properly. If your driveshaft is failing, you’ll have very visible symptoms. Here are 6 common signs to look out for:
#1 – Trouble Turning
The most obvious symptom of a bad driveshaft is when your car becomes difficult to turn. A problem with the universal joint at the end of the driveshaft means the wheels aren’t getting the proper torque, which increases resistance and makes it very difficult to turn.
Difficulty turning could indicate other issues (from low power steering fluid to damaged differentials), so be sure to combine this symptom with the others listed below to confirm this. Once the driveshaft is confirmed to be defective, it must be replaced immediately, or you risk an accident due to loss of control of the vehicle.
#2 – Squeaking Noise
If the squeaking noise doesn’t go away, it could be a problem with the driveshaft. This could be due to worn internal components such as bushings or bearings on the shaft or universal joint, or an imbalance in the shaft. The noise usually gets louder as the speed increases.
#3 – Universal joint rotation problems
Drive shafts have universal joints that rotate at a certain speed. If they rotate poorly or too quickly, the drive shaft will have problems. The universal joint may be bad or the bearing cap seals may have rusted. If the damage is too extensive, the entire drive shaft may need to be replaced.
#4 – Rattling noises
A faulty drive shaft can cause a rattling noise when accelerating or reversing. These noises can occur in addition to the creaking noises you usually hear all the time. At this point, you should be motivated enough to want to replace the shaft before any real damage occurs.
#5 – Vibrations
If your drive shaft is worn out, you will experience vibrations under the vehicle that can be felt through the steering wheel or floor. These vibrations and another symptom should be a clear sign that your shaft needs replacing.
In these cases, it is most likely that the shaft bushings are worn out. Keep in mind that the shaft is held in place by a bushing. If the bushing is loose, damaged, or worn, the shaft will vibrate. This can cause the shaft to tilt and become damaged.
#6 – Shudder When Accelerating
If you notice a shudder or vibration when trying to accelerate from a standstill or low speeds, your driveshaft universal joint or center bearing may be worn out. This is usually accompanied by a strange noise as well. You should have a certified mechanic look under the car and inspect all components related to the driveshaft to confirm the problem.