How do I get rid of transmission shudder?

Transmission shudder is a common issue that can occur in vehicles, causing a noticeable vibration or shaking sensation when the transmission is engaged. This problem can be caused by a variety of factors, including worn components, improper fluid levels, or even a problem with the torque converter. Fortunately, there are several steps you can take to diagnose and address transmission shudder.

Identifying the Cause of Transmission Shudder

The first step in addressing transmission shudder is to identify the underlying cause. This may involve a thorough inspection of the transmission and related components, as well as a test drive to observe the behavior of the transmission under different driving conditions. Some common causes of transmission shudder include:

• Worn or damaged transmission components: This can include the clutch plates, torque converter, or other internal parts that may be worn or damaged over time.


• Improper transmission fluid level or quality: If the transmission fluid is low or has become contaminated, it can lead to shuddering or slipping.


• Misalignment or wear in the driveline: Issues with the driveshaft, U-joints, or other components in the driveline can contribute to transmission shudder.


• Faulty torque converter: A problem with the torque converter, such as a worn or damaged clutch, can cause the transmission to shudder.

Once the underlying cause has been identified, you can proceed with the appropriate repair or maintenance steps to address the issue.

Addressing Transmission Shudder

Depending on the cause of the transmission shudder, the solution may involve one or more of the following steps:

• Replacing worn or damaged transmission components: This may include the clutch plates, torque converter, or other internal parts that have become worn or damaged over time.


• Changing the transmission fluid: Flushing the transmission and replacing the fluid with the recommended type and quantity can help address issues related to fluid contamination or low levels.


• Aligning or replacing driveline components: If the issue is related to the driveline, such as a worn U-joint or misaligned driveshaft, these components may need to be repaired or replaced.


• Repairing or replacing the torque converter: If the torque converter is the source of the shudder, it may need to be repaired or replaced.

It's important to note that addressing transmission shudder may require the expertise of a qualified automotive technician, as the repair process can be complex and may involve specialized tools and equipment.

Preventive Maintenance

To help prevent future transmission shudder, it's important to follow the recommended maintenance schedule for your vehicle, including regular transmission fluid changes and inspections. Additionally, being mindful of driving habits, such as avoiding sudden acceleration or deceleration, can help extend the life of the transmission and reduce the risk of shudder.

What is the best transmission shudder fix?

The best fix for transmission shudder is typically adding a product like LUBEGARD Instant Shudder Fixx to first diagnose if the issue is fluid-related, followed by a full fluid exchange and conditioner like LUBEGARD ATF Protectant (Red) for a long-term solution. If the shudder persists after the initial additive, it indicates a mechanical problem with the torque converter or transmission that may require a professional repair. 
Step 1: Use an additive for diagnosis and temporary fix 

• Use a friction modifier additive: Products like LUBEGARD Instant Shudder Fixx are designed to treat shudder issues caused by depleted or degraded transmission fluid. 
• Diagnose the problem: If the shudder disappears after using the additive, the issue was likely fluid-related, and this product is a temporary solution. If the shudder does not go away, it points to a potential mechanical failure. 
• Safety precautions: Follow the product's instructions carefully, and note that this product is not for older Ford Type F fluids, continuously variable transmissions (CVTs), or dual-clutch transmissions (DCTs). 

Step 2: Implement a long-term solution 

• Perform a transmission fluid flush: This will replace the old, contaminated fluid with a clean, fresh batch. 
• Add a long-term conditioner: After the flush, add a high-performance conditioner like LUBEGARD Synthetic ATF Protectant (Red). This product restores depleted additives, protects against wear and heat, and is often recommended by manufacturers. 
• Consider the Lucas Transmission Fix: Another option is the Lucas Transmission Fix, which can address the immediate issue while also supporting long-term transmission health. 

Step 3: Address mechanical problems

• If shudder persists, seek professional help: If the shuddering continues after trying the additives and fluid flush, it indicates a more serious mechanical problem with the torque converter or other internal components. 
• Consult a mechanic: A mechanic can properly diagnose the mechanical failure and perform the necessary repairs, which may include a torque converter rebuild or replacement. 

How to fix transmission shuddering?

A transmission shudder can be fixed by adding a friction modifier fluid like LUBEGARD Instant Shudder Fixx for a temporary solution or by addressing the underlying issue with a transmission flush and fluid replacement. If the problem persists, a professional diagnosis is recommended to check for more serious internal component damage, which would require professional repair.
 
Temporary fix
This video demonstrates how to use a transmission shudder fix fluid: 56sShop OwnerYouTube · Jan 25, 2023

• Use a shudder fix additive: For a low-cost, temporary fix, add a product like LUBEGARD Instant Shudder Fixx to the transmission fluid. It contains friction modifiers that can eliminate torque converter shudder. 
• How to apply: Locate the transmission fluid dipstick or fill port. Use a funnel to pour the additive into the transmission. You may need to start the engine with the fill plug loosened to pump some fluid out, creating space to add the fix. 

Long-term fix
This video explains how to do a transmission flush and fluid change: 58sFreedom Family Auto GroupYouTube · Jul 20, 2024

• Transmission flush and fluid replacement: Contaminated or low transmission fluid can cause shuddering. A flush removes old, dirty fluid and replaces it with new fluid, which may solve the problem. 
• Check for leaks: Low fluid can indicate a leak. If you have to refill the fluid, have the system inspected for leaks that will need to be repaired to prevent the issue from returning. 
• Get a professional diagnosis: If the shuddering continues after trying these steps, it may be caused by a more serious internal issue with the transmission or torque converter. A mechanic can diagnose the problem and recommend a repair, which could involve replacing worn-out components. 

What can I put in my transmission to make it shift smoother?

To make your transmission shift smoother, try using a high-quality transmission fluid or a transmission additive designed to clean and lubricate internal components. First, check your transmission fluid level; if it's low, adding the correct type of fluid can resolve rough shifting. If the fluid is old or has degraded, replacing it is a highly effective solution. If that doesn't work, a cleaner can help by removing deposits on valves and solenoids.
 
This video explains how to check transmission fluid level: 1mCar CareYouTube · Dec 4, 2023
Actions to take

• Check the fluid level: A low fluid level is a common cause of rough shifting. If it's low, top it off with the correct type of transmission fluid for your vehicle. 
• Replace the transmission fluid: Over time, transmission fluid can break down. Replacing old fluid with fresh, high-quality fluid—especially a 100% synthetic option—can significantly improve shifting performance. 
• Use a transmission additive: Products like Lucas Transmission Fix, Rislone Transmission Repair, or Sea Foam Trans Tune are designed to clean internal parts like valve bodies and solenoids that can get gummed up with varnish. 
  • To use, pour the additive into the transmission through the dipstick tube. 
  • Drive for the recommended mileage (often 30–100 miles) to allow the cleaner to work. 
  • The additive can be left in until your next fluid change if it resolves the issue. 

Important considerations

• Identify the problem: While additives can help, they are not a substitute for repairing a physically damaged transmission. If the problem persists, further diagnosis may be needed. 
• Avoid certain fluids: Do not use additives in a CVT (Continuously Variable Transmission), DCT (Dual-Clutch Transmission), or older Ford Type F transmissions unless the product explicitly states it is compatible. 
• Consider other issues: Rough shifting can also be caused by a faulty sensor or a vacuum leak, so a professional inspection may be necessary to rule out these other potential causes. 

This video discusses common transmission problems and their solutions: 0:11EarPretend4431Reddit · May 29, 2023

What can be mistaken for torque converter shudder?

Shudder can be mistaken for a few other driveline gremlins. A misfiring engine will give you a jerky, uneven feel under load at almost any speed, not just in a narrow band. Wheel balance problems show up at the same speeds whether you're on throttle, coasting, or braking.