The Symptoms of a Bad Rear Diff

When you need to be able to rely on your vehicles, differential servicing and repair is a crucial part of maintaining your fleet.

Share Post:

Differentials are responsible for transferring the power of the engine to the driven wheels. These components are built to high tolerances and they work incredibly hard, especially in commercial vehicles.

When you need to be able to rely on your vehicles, differential servicing and repair is a crucial part of maintaining your fleet. Proactive servicing and repair maximises uptime, reduces the likelihood of breakdowns, and reduces the need for costly replacements.

Driveline Services Australia are the experts when it comes to economical and reliable differential services. Contact us for an inspection if you notice the following problems with the differential in your vehicle.

What is a Rear Differential?

A differential (often called a diff) is a gear train that transfers power from the engine to the driven wheels of a vehicle. Diffs also allow the wheels to rotate at different speeds while cornering, which is crucial for vehicle handling and performance.

In most cases, the differential is located on the rear axle. It translates longitudinal power from the propshaft into latitudinal power across the rear axle or driveshafts.

Rear-wheel drive, all-wheel drive and four-wheel drive vehicles have a rear differential. Front-wheel drive vehicles (as well as some types of rear and four-wheel drive vehicles) use a transaxle, which combines the functions of a differential and transmission.

Transaxles and alternative differential arrangements are subject to the same stressors as conventional differentials, so they require regular servicing to prevent breakdowns.

diff centre product

Bad Rear Diff Symptoms

Differentials are tough assemblies that rarely fail all at once. However, the internal components and bearings wear out over time, and they may become damaged (especially due to rust or off-road driving). These are some of the most common symptoms of a failing rear diff:

  • Grinding, howling or clicking noises. Differentials make all sorts of noises as they wear out. Listen for clicking or grinding noises when you accelerate or steer through a corner. Listen for howling noises when driving at high speeds.
  • Vibrations and shaking. Faulty diffs often cause noticeable vibrations, especially while accelerating. Excessive vibrations are a sign of a major fault and should be repaired as soon as possible to avoid further damage.
  • Difficulty steering. A worn out diff can cause your vehicle to pull to one side or become difficult to steer.
  • Oil leaks. Diffs contain oil that provides lubrication and keeps the internal components cool. Oil leaks should be addressed as soon as possible.
  • Excessive tyre wear. Worn out diff centres can often cause tyres to wear down quickly. Look for signs like excessive wear, uneven wear marks, or damage towards the outside of the tyre (e.g. cracks or chunks of rubber missing).
  • Overheating. Diffs may overheat when operating at high speeds or when hauling heavy loads. This reduces the performance of the lubricants and can damage internal components. Regular overheating may be a sign that your diff and/or gear ratios are unsuitable for your application.

When to Have Your Differential Repaired

You should have your diff repaired at the first sign of trouble.

Differentials are built to tight tolerances. As components like bearings wear out, small imperfections can turn into major wear and tear. This can turn a simple repair job into a major rebuild project.

Diffs should always be repaired by the diff specialists at Driveline. Repairing and reassembling a diff requires specialist equipment and expertise. Working with a diff specialist is the only way to ensure your diff is repaired to OE standards and that it’s suitable for your application.

Diff Rebuild vs Replacement

If your diff is damaged, worn or reaching the end of its life, you’ll need to decide between a rebuild and replacement.

While diff repairs typically involve replacing major bearings and seals, a full rebuild may include replacing bearings, seals and gears. This is ideal if your diff has damaged or corroded components, or if you’re looking to upgrade to heavy-duty components.

Rebuilding a diff can be time and labour intensive. In some cases, it may be more cost-effective to replace the entire unit. The right choice depends on your budget, timeframe and whether parts are available for your vehicle.

Talk to the diff specialists at Driveline to find out which option is better for your vehicle. While a rebuild is often the most cost-effective option, we may recommend a new or reconditioned replacement diff for your vehicle.

Mechanic standing in workshop with vehicle on hoist | Driveline Services Australia

Get Your Fleet Ready for Anything with the Diff Specialists at Driveline

The rear diff is one of the most important components in any vehicle. Whether you’re driving around town, transporting loads or operating heavy vehicles, diff maintenance and repair is crucial to performance.

The team at Driveline specialises in diff repair, rebuild and replacement services for all types of vehicles and equipment. We operate a national network of automotive workshops that are equipped to service passenger vehicles, 4x4s, trucks, mining vehicles and much more.

Driveline Services Australia carries an extensive range of differential parts from OE and aftermarket suppliers across the globe. Our automotive workshop services have access to tens of thousands of unique components, allowing us to rebuild or repair any differential.

Contact us today for a quote on differential servicing, repair, rebuild and replacement.

Stay Connected

You May Also Like