5 Signs Your Transmission Has a Serious Problem

Summary

In this video, Scotty Kilmer explains why automatic transmission fluid flushes are often not a good idea, especially for modern cars. While flushing might seem beneficial, it can push debris into sensitive parts of the transmission, causing more harm than good. Scotty recommends changing the fluid and filter regularly (every 60,000 miles), which is sufficient for most vehicles. He emphasizes that modern transmissions are better built, and fluid longevity has improved, making unnecessary flushes a potential risk. He also shares an exception where a flush could temporarily help a severely worn transmission, but warns against relying on it for newer cars.

Takeaways

• 😀 Transmission flushes can be risky and may lead to issues like slipping or rough shifting after the procedure.
• 😀 Flushing is different from radiator flushing and is not ideal for automatic transmissions, which have complex systems like solenoids and small pressure-sensitive passageways.
• 😀 Changing transmission fluid regularly (every 60,000 miles) and replacing the filter is the best practice for maintaining a healthy transmission.
• 😀 The claim that modern transmission fluid is 'lifetime' fluid is misleading. It's still advisable to change it every 60,000 miles to avoid potential issues.
• 😀 Transmission fluid is cheaper than a rebuild or replacement, so regular fluid changes are much more cost-effective than waiting for major transmission failures.
• 😀 Old, dirty transmission fluid may help transmissions function better in worn vehicles due to its higher friction, so flushing it could worsen issues.
• 😀 Shops may promote transmission flushes as a profit-making service, as it's easier to perform than changing the fluid and filter.
• 😀 Older cars with severe transmission problems may benefit from a flush as a temporary solution, but this approach is not effective for well-maintained vehicles.
• 😀 Transmission systems in modern cars are far more reliable and efficient than older systems, so flushing is generally unnecessary.
• 😀 In extreme cases, using additives like Lucas can sometimes help restore functionality, but the effectiveness is not guaranteed, especially in heavily worn transmissions.
• 😀 Always recycle used transmission fluid properly to avoid environmental harm and make sure to check and measure fluid levels before refilling.

Q & A

Why is flushing the automatic transmission fluid not recommended?

Flushing the transmission fluid can cause dirt and debris to be pushed into sensitive internal parts of the transmission, potentially causing issues like clogging or damage. The process of power flushing might even worsen transmission problems that weren't apparent before.

What is the main reason why automatic transmission fluid doesn't need to be flushed as frequently as some people think?

Modern automatic transmissions are designed to be more durable, and the fluid is of higher quality. Regularly changing the fluid and filter at intervals like 60,000 miles can prevent major problems without the need for a full flush.

What happens when you flush transmission fluid on a vehicle that has never had the fluid changed?

If the transmission fluid has never been changed, flushing can dislodge built-up dirt and debris, which may clog small passageways and cause shifting problems or other issues like slipping or rough shifting.

Is it true that modern cars have 'lifetime' transmission fluid?

No, this is misleading. While modern transmission fluid may last longer than older fluids, it still requires changing at intervals to ensure the transmission operates smoothly and to prevent issues like slipping. Typically, the fluid should be changed every 60,000 miles.

What are some common signs that your transmission might be having problems?

Signs of transmission problems include slipping when trying to accelerate, harsh or jerky shifting, or the car not moving when in reverse. These are indicators that the transmission may be worn or that there's an issue with the fluid.

What is the best way to maintain a transmission over time?

The best way to maintain a transmission is to change the fluid regularly and replace the filter when necessary. This helps prevent dirt buildup and ensures that the transmission continues to work smoothly.

Why might some mechanics recommend transmission fluid flushing?

Some mechanics may recommend flushing because it's an easy service for shops to perform with the right equipment, and it is often more profitable for them. However, it's not always the best solution for maintaining a healthy transmission.

What should you do if your transmission is slipping or acting up, and you're considering a flush?

If your transmission is slipping, consider changing the fluid and filter first. If the problem persists, a transmission flush might help, but only in extreme cases, like a vehicle that's almost undriveable. It's better to try changing the fluid and adding an additive first.

What is the role of the transmission filter?

The transmission filter helps capture dirt and debris in the fluid, preventing it from clogging the system and ensuring smooth operation. Changing the filter regularly is essential for maintaining transmission health.

What is the significance of a torque converter lock-up in modern vehicles?

A torque converter lock-up helps eliminate slippage in the transmission at higher speeds, improving fuel efficiency. When this system fails, it can cause slipping and result in poor performance, which might be indicated by a trouble code like P0741.