What Is A Wave Plate In An Automatic Transmission?

ACDelco® 24202950 - GM Original Equipment™ Automatic Transmission

Have you ever wondered what a wave plate is in an automatic transmission? You're not alone - a wave plate plays a key role in the smooth operation of an automatic transmission, and many transmission owners probably don't know what it is or what it does. So if you've been wanting to learn more about this integral component, this article is for you.

What is a Wave Plate?

A wave plate is a disc that is located inside the transmission housing. The wave plate, which is spring-mounted, has two functions: to minimize start-up shock for smoother shifting, and to control the torque converter clutch. It also plays a role in preventing transmission lock-up. It works in conjunction with the torque converter to make sure the appropriate hydraulic pressure is sent to the transmission during shifts.

How Does the Wave Plate Work?

When the wave plate is at rest in the transmission, it results in a lag-free start. This is because the wave plate compresses as the engine accelerates, allowing for optimal torque conversion. The wave plate also helps to reduce shift shock, meaning that it doesn’t jar or shock the components when the transmission shifts from one gear to the next.

The wave plate also helps to improve clutch control. When the wave plate is compressed, it effectively expands the area of contact between the converter clutch and the gear, allowing for a smoother engagement. During start-up, the wave plate will compress to decrease the opening angle, which helps to provide smoother gear shifts.

Signs of Wave Plate Failure

There are a variety of signs that may indicate the wave plate is no longer working properly. These include jerky shifting and transmission shudder. If the wave plate is failing, you may notice an increase in gear rattle, transmission slip, failure to lock-up, and a decrease in fuel economy. Another common sign of wave plate failure is delayed shifts. If the wave plate isn’t working correctly, it can take longer for the transmission to shift from gear to gear.

Replacing Your Wave Plate

If you believe your wave plate is failing, the best thing to do is to take it to a certified transmission specialist for inspection and replacement if necessary. Replacing a wave plate isn’t as difficult as other transmission-related repairs, however, it should still be done by a professional.

When it comes to wave plates, preventive maintenance is key. Checking your wave plate periodically, especially if you have a high-mileage vehicle, can prevent potential transmission problems in the future.

The Impact of a Wave Plate

A wave plate plays an integral role in an automatic transmission, and when it’s damaged or not working properly, it can cause a variety of problems. That’s why it’s essential to understand what a wave plate is and what it does. By having a working knowledge of the wave plate and knowing what signs to look for, you can help keep your transmission running smoothly for years to come.


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