What To Do If Transmission Clunk When Slowing Down?

Transmission clunking problems in a car can be one of the major maintenance a car owner can undergo. When you try to drive a car without a fully working transmission, it may not operate effectively.

Imagine you hear a repeated clunking sound every time you slow down your car, now you have an adequate reason to be concerned about your car because transmission clunk when slowing down the car is a serious issue. This article aims to provide a solution to your issue.

Reasons Why Transmission Clunk When Slowing Down

You may hear weird noises coming from your transmission when it initially starts to fail. As you shift gears, these noises will become more prominent. Keep in mind that the transmission is linked to the gearbox, which is a system that allows drivers to change speeds.

When you shift into a different gear, the engine changes its speed and power to meet the increased demand. Because the gearbox is now transferring this increased engine power to the driveshaft, the spinning components of the transmission speed up throughout this operation.

Here are some of the reasons why your car transmission is clunking:

1. Low Or Incorrect Transmission Fuel Levels

When you’re short on transmission fluid, your car won’t perform properly. This is because transmission fluid lubricates the transmission system’s surfaces and components to minimize friction and prevent wear.

If you keep your transmission fluids at a low level, you’ll hear a gurgling noise from underneath. Many drivers make the mistake of not monitoring the fluid levels in their vehicles. As soon as the gearbox slips, they will frequently detect this noise.

2. Faulty/Bad Transmission Range Switch

When you turn the ignition key to the “on” position, the TRS is an electrical switch that notifies your vehicle’s powertrain control module of what gear your gearbox is in. Its purpose is to prevent you from starting your engine while it is running unless the gearbox is in the ‘neutral’ or ‘park’ position, or if you don’t press the clutch pedal in a manual transmission. Bad or faulty TRS will lead to clunking noises in the gearbox.

3. Driveshaft Bearings Are Damaged

Bad or worn drive shaft bearings are another major source of the noise. Natural wear and tear, a little quantity of oil in them, or dust that has settled inside these bearings all contribute to this.

4. Gear Differentials

The wear of the differential gears is another cause of transmission noise. The sound they create is metallic in nature. It normally comes gradually and goes unnoticed by the driver, but when the automobile slides, you may see this sign. The driving wheels in this situation revolve unevenly but with a lot of torque. This puts a lot of strain on the differential, causing it to break sooner.

When you start the engine, the automobile will roll back and forth, which is a sign of a malfunctioning differential. If you see this, you should inspect the differential for damage.

What Should You Do If You Encounter Transmission Noises?

If you have an older automobile with a gearbox problem, you might be tempted to trash it right away – and with good cause. Thousands of dollars might be spent on a transmission overhaul or replacement. However, depending on the nature of your transmission problem, the technician may not be your first port of call. A surprising number of transmission problems may be resolved by yourself using the correct products, at least in the short run.

Here are some of the useful steps you can perform in order to fix it and avoid major transmission tears in future:

1. Ensure Correct Levels Of Fluid

Maintaining correct levels of transmission fuels can reduce unwanted clunking and grinding noises. To avoid possible transmission damage, get quick assistance from a service specialist. Furthermore, some automatic transmissions lack dipsticks or require that the automatic transmission fluid level be checked by a service specialist. Consult the owners or service manual for further information.

2. See If the ‘Check Engine Light Is On

The “check engine” light isn’t designed to terrify you into visiting a technician, contrary to popular belief. This light might come on for a variety of causes, including broken spark plugs, worn-out air filters, and everything in between. If your check engine light is on and you’re experiencing any of the above indications or symptoms of a transmission problem, don’t ignore it. Take your vehicle to a certified repair shop right away and have the error code diagnosed to figure out what’s wrong.

3. Check For Wear And Tear Underneath

Manually inspect your vehicle or take it to a technician to get it inspected.

4. Drive Over a Distance

Your shock absorbers may be worn out if you hear a light to moderate ‘clunk’ or ‘pop’ sound when going over bumps. Your steering and braking systems will become less effective as a result of the broken shock absorbers, increasing the risk of a collision. So, you should get your shock absorbers fixed.

Frequently Asked Questions-

Here are some frequently asked concerns concerning transmission clunk when slowing down:

1. What Causes Clunk In The Transmission?

Low transmission fluid and worn-out gears can cause clunking, as can digital sensors and solenoids that give incorrect information to your car’s gearbox.

2. What Are The Warning Indications That Your Transmission Is Failing?

Automatic transmission difficulties are indicated by clunking, buzzing, or whining sounds. Faulty manual transmissions also emit loud machine-like noises that appear out of nowhere. A clunking sound when shifting gears indicates a gearbox problem.

3. What Are The Top Five Indicators Of Transmission Issues?

Top 5 Transmission Trouble Signs:

  • Grinding Sounds A grinding noise that occurs when shifting is one of the most prevalent indications of transmission failure.
  • Burning Smell Transmission fluid has a sour or slightly sweet aroma.
  • Warning Light for Transmission
  • Shifting is delayed.
  • Leaking Transmission Fluid

4. Can I Drive If My Gearbox Slips?

To put it simply, you should never drive your car if you suspect there is a problem with the transmission. When a transmission begins to slide, it must be fixed right away. It’s a danger every time you drive it once your gearbox slips.


Maintaining a regular maintenance schedule for your vehicle is critical. When a car is properly maintained, big expensive repairs can often be avoided. This is especially true if you observe anything out of the ordinary. The vehicle should be serviced as soon as possible. Brushing up on your transmission knowledge (at least the basics) is highly recommended to save you from various problems like Grinding or shaking sensation in gear, transmission clunk when slowing down the car, Gears Slipping etc.

It can save you money by avoiding costly inspections and allowing you to perform simple procedures like changing transmission fluid yourself, as well as equipping you with the knowledge to avoid being over-repaired, overcharged, or simply ripped off.

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