Parts for your 2018 Lexus Is-Universal joints

Universal Joints and the 2018 Lexus IS: What You Need to Know

When it comes to the 2018 Lexus IS, many car owners and enthusiasts wonder whether universal joints play a role in its drivetrain or suspension systems. Universal joints, often called U-joints, are mechanical components designed to transmit rotary motion between shafts that are not in a perfectly straight line. They are common in many rear-wheel drive vehicles, especially those with a solid rear axle, where the driveshaft needs to accommodate movement and angular changes as the vehicle travels over uneven surfaces.

However, the 2018 Lexus IS uses a different approach. Specifically, the IS is equipped with a drivetrain layout and components that do not rely on traditional universal joints like those found in older rear-wheel or four-wheel drive vehicles. The 2018 IS features an independent rear suspension with CV (constant velocity) joints instead of universal joints. CV joints are designed to handle similar functions but provide smoother power delivery and better handling characteristics, especially at higher angles and speeds.

So, why exactly are universal joints not used on the 2018 Lexus IS? The key lies in the design and modern engineering advances. Universal joints have been largely replaced in front-wheel and all-wheel drive vehicles by CV joints because CV joints maintain constant rotational speed between input and output shafts despite changes in angle, reducing vibration and noise. The Lexus IS, with its sporty handling and emphasis on refinement, benefits from CV joints that provide smoother and more efficient power transfer to the wheels.

Additionally, the independent rear suspension setup means that the rear wheels move independently over bumps. This suspension design requires joints that can accommodate greater wheel movement and maintain a constant velocity, something CV joints handle better. Universal joints, by contrast, can introduce changes in rotational velocity during operation, especially at higher angles, potentially causing vibrations and discomfort.

With that said, the universal joint is essentially not a relevant part in the drivetrain of the 2018 Lexus IS. Instead, owners should focus on components like CV joints, drive shafts, and other drivetrain elements that are actually present on this model. Maintaining these parts properly ensures smooth performance and longevity.

For those curious about the role of universal joints in vehicles that do have them, here is a bit of insight into their purpose and maintenance, even though they do not apply directly to the 2018 Lexus IS.

Universal joints serve as flexible couplings that connect rotating shafts when they are at an angle to each other. This flexibility allows power from the engine and transmission to reach the wheels even as the suspension moves up and down, or as the steering changes the orientation of front wheels. You'll find these joints most commonly in the driveshafts of rear-wheel Drive vehicles, 4WDs, and older or simpler drivetrain setups.

If you do happen to own a vehicle fitted with universal joints, regular maintenance is a must to avoid breakdowns. U-joints operate under a lot of stress, and over time they can wear out due to a lack of lubrication, contamination, or simply metal fatigue. Worn U-joints may cause clunking noises when shifting gears, vibrations at certain speeds, and even driveline failure if ignored.

Maintenance typically involves greasing the U-joints at scheduled intervals, which keeps the bearings lubricated and reduces wear. Some modern U-joints come sealed for life, meaning they don't require separate greasing, but older or more basic designs certainly do. When inspecting U-joints, mechanics often check for play by moving the driveshaft back and forth to detect any looseness. If there is movement in the U-joints, replacement is usually necessary.

Replacing universal joints is a straightforward but important task and should always be performed carefully. If one joint fails, it's best practice to replace all U-joints on the driveshaft to ensure even wear and reliability. Repair shops usually press the worn joints out and fit new ones using specialised tools. This process also involves rebalancing the driveshaft to prevent future vibrations.

While universal joints are not part of the 2018 Lexus IS's drivetrain, understanding their function is useful when comparing vehicles or considering maintenance of different car models. The IS's use of CV joints instead reflects a prioritisation of driving smoothness, reliability, and handling. Owners of a 2018 Lexus IS will do better focusing on maintaining the CV joints and related components for a trouble-free experience.

In short, universal joints are not found on the 2018 Lexus IS because the vehicle utilises more advanced drivetrain technology suited for its independent suspension and sporty ride qualities. But for vehicles that do use U-joints, regular inspection and proper servicing are essential to keep everything turning smoothly under the hood and down the road.