Parts for your 2018 Holden Commodore-Universal joints

Universal Joints on the 2018 Holden Commodore: What You Need to Know

The 2018 Holden Commodore is a popular Australian sedan known for its performance and reliability. When people hear about driveline components, universal joints often come up, but for this specific model, the use of universal joints is a bit different compared to some other vehicles.

Universal joints, or U-joints, are mechanical components used in the driveline of many rear-wheel drive and four-wheel drive vehicles. They allow for the transmission of torque and rotational motion between two shafts that are not perfectly aligned. For many rear-wheel drive cars, they are found in the driveshaft to handle the changes in angle as the vehicle moves and the suspension works. However, the 2018 Holden Commodore, especially with its independent rear suspension (IRS), does not typically use conventional universal joints in the driveshaft the way older solid axle rear-wheel drives do.

This Holden Commodore is equipped with an independent rear suspension setup, which uses constant velocity (CV) joints instead of traditional universal joints. CV joints are preferred in this arrangement because they can accommodate the wider range of movement in the driveline that comes with the IRS design, providing smoother power delivery and reducing vibration. In other words, the Commodore's IRS setup calls for CV joints on the drive shafts rather than universal joints, which tend to perform better where angular movement is less pronounced and rotation speeds are constant.

So if you are looking for universal joints under this model, you won't find them in the usual spot. Instead, you'll find CV joints on the rear axle shafts driving the wheels. This is why universal joints are not relevant to the 2018 Holden Commodore's driveline, because the vehicle's design and suspension demand a different kind of joint to deliver power effectively and smoothly.

Of course, that does not mean the vehicle owner should disregard joint maintenance entirely. CV joints are equally important to maintain, and just like universal joints, they require regular inspection, lubrication, and sometimes replacement. But if universal joints were fitted to a car like the 2018 Holden Commodore, here's what would generally apply.

Universal joints serve the important purpose of connecting rotating shafts while allowing for changes in alignment and angle. In most rear-wheel drive vehicles without IRS, the driveshaft has to connect the gearbox output to the rear differential input, and as the suspension moves, the driveshaft angles change slightly. The U-joint compensates for this by allowing the shaft to flex and articulate without transmitting vibration or putting undue stress on the components. This keeps power flowing smoothly to the rear wheels, even over bumpy or uneven roads.

Maintaining universal joints is essential to avoid driveline problems. Common signs that a U-joint may be wearing out include clunking noises when shifting gears or starting off, vibrations at higher speeds, or even visible rust and damage on the joint itself. Regular servicing usually involves lubricating the U-joints with fresh grease if they are the greaseable type. Many U-joints come with a grease nipple to keep the internal bearings well lubricated, which greatly extends their lifespan.

If a universal joint fails, it can lead to serious driveline damage and safety risks. A failed U-joint will cause significant vibration, clunking noises, and can eventually lock up, potentially causing loss of power to the wheels or even damage to the driveshaft and surrounding components. That is why it is important to inspect U-joints during routine services and replace them promptly when signs of wear or failure are found.

When it comes to replacing U-joints, vehicle specialists usually recommend using high-quality aftermarket parts or OEM replacements designed for that specific vehicle. The replacement process involves removing the driveshaft from the vehicle, pressing out the old U-joints, and installing new ones accurately to avoid misalignment. Some mechanics will also check the driveshaft for balance after installation to minimise vibration and ensure smooth operation. It's a good idea to have these procedures done by professionals unless you are confident with mechanical work.

To wrap up, while the 2018 Holden Commodore does not use universal joints due to its independent rear suspension and reliance on CV joints, understanding the role of U-joints in other vehicles helps appreciate the complexity of driveline design. For Commodore owners, the focus should be on regularly checking the CV joints and rear axle shafts to keep the car performing well and avoid unexpected drivetrain issues. Always follow the manufacturer's service schedule and consult a qualified mechanic for any driveline concerns.