Is 8-speed automatic transmission good?

For most drivers, yes — an 8-speed automatic is a well-rounded choice that typically delivers strong fuel economy, smooth shifting, and adequate performance across a broad range of vehicles.

What defines an 8-speed automatic

Eight-speed automatic transmissions use eight discrete gears to balance acceleration with highway efficiency. They are usually torque-converter automatics, though some performance-oriented designs exist that emphasize different shifting characteristics. The wide gear range helps engines stay in their sweet spots, whether you’re accelerating from a stop or cruising on the highway.

Gear ratio and operation

The key advantage is a broad gearing spread: low gears provide good launch and torque handling, while high gears reduce engine revolutions at cruising speeds, which improves fuel economy and reduces noise. This design is particularly effective with turbocharged or high-torque engines that benefit from a wider torque converter or transmission tuning.

Benefits for everyday driving

Below are the core advantages modern eight-speed automatics typically offer in daily use. A well-calibrated eight-speed can feel almost as responsive as a manual in some driving scenarios, while delivering smoother shifts and better long-run efficiency.

• Better highway fuel economy due to tall top gear and optimized engine matching


• Smoother shifts and broader torque delivery across ranges


• Strong low-end response when paired with turbocharged engines


• Wide brand and model availability, with many engines designed around this transmission

In practice, these traits translate to mostly quiet cruising, quicker acceleration when needed, and improved overall efficiency compared with older, fewer-gear designs.

Variations among brands

Different automakers source eight-speed units from suppliers such as ZF, Aisin, or internal designs. Tuning varies by model, affecting shift feel, response, and efficiency. As a result, the same drivetrain in two different cars can feel noticeably different.

Potential drawbacks or caveats

While the eight-speed architecture is generally reliable and efficient, there are downsides buyers should consider before purchase.

• Cost and maintenance: newer, more complex units can incur higher repair costs and fluid-change requirements depending on the model


• Weight and feel: some drivers perceive slightly heavier feel or delayed engagement in certain driving situations


• Model-specific reliability: reliability and refinement depend heavily on the specific transmission design and how it’s tuned for a given vehicle


• Towing considerations: not all eight-speed transmissions are equally rated for heavy towing; verify torque capacity and cooling for your needs

Overall, while most owners experience favorable ownership experience, it’s important to check the exact transmission model, maintenance history, and towing requirements for any specific vehicle.

Maintenance and longevity considerations

Follow the manufacturer’s service schedule for transmission fluid changes and filters, use the recommended fluid, and pay attention to any recalls or software updates. Proper maintenance often determines longevity more than the number of gears alone.

When to consider alternatives

There are scenarios where other transmissions may be preferable, depending on priorities such as driving feel, cost, or duty cycle.

• Pure performance driving: some enthusiasts prefer a different shift strategy or a high-performance design that prioritizes rapid shifts


• Extreme towing or off-road use: certain transmissions with specialized cooling or gearing profiles may offer advantages


• Budget-conscious buyers: simpler or older transmissions can sometimes offer lower upfront cost or easier maintenance

Choosing the right option means matching the transmission’s strengths to your typical driving profile and ownership expectations.

Summary

An eight-speed automatic is generally a good, versatile choice for most drivers, offering a favorable mix of efficiency, smoothness, and everyday performance. Its success depends on the specific transmission design, the vehicle it’s paired with, and how well it’s maintained. For prospective buyers, evaluate your typical driving patterns, towing needs, and the track record of the particular eight-speed unit in your target model, and follow the manufacturer’s service schedule to maximize longevity.

What is the advantage of the 8-speed transmission?

An 8-speed automatic transmission delivers a sportier feel. It shifts through fixed gears, giving the driver more control. This is ideal for quick acceleration, highway merging, or towing.

What is the most reliable type of automatic transmission?

The most reliable automatic gearboxes are often Aisin transmissions (used by Toyota and other manufacturers), ZF's 8-speed torque converter (found in many luxury and performance cars), and hybrid eCVTs (like those used by Toyota). Torque converter automatics are generally considered the most durable option for their robustness, though some modern designs are more complex.
 
This video explains different types of automatic transmissions and their reliability: 1mCar Help CornerYouTube · Oct 19, 2025
Highly reliable automatic gearboxes 

• Aisin transmissions: Aisin, a company with a significant Toyota stake, is widely recognized for producing durable automatic transmissions. They are known for quality components and designs that can last well over 200,000 miles. 
• ZF 8-speed torque converter: This is a highly regarded modern automatic transmission known for its quick shifts and reliability. It is used by many manufacturers, including BMW, Dodge, and Audi. 
• Toyota's eCVT: Toyota's electronically controlled continuously variable transmission (eCVT) is found in its hybrid vehicles and is considered exceptionally reliable. Its simple design makes it less prone to failure, often lasting the life of the vehicle. 
• Other reliable torque converters: Traditional torque converter automatics, in general, are valued for their durability and simplicity, making them a reliable choice, especially for heavy-duty vehicles. 
• Mazda's transmissions: Mazda's conventional torque converter gearboxes, like those in the Mazda 3 and 6, are also considered reliable. 

You can watch this video to learn about reliable transmissions in hybrid vehicles: 1mCar Help CornerYouTube · Jun 15, 2025
Factors to consider

• CVT vs. torque converter: While some CVTs can be very reliable (especially certain models like Toyota's), traditional torque converter automatics are often favored for long-term durability, particularly for high-load applications.
• DCT (dual-clutch transmission): Dual-clutch gearboxes are designed for performance but can be less reliable and might not be ideal for everyday city driving compared to torque converter automatics.
• Maintenance: Proper maintenance, such as timely fluid changes and avoiding aggressive driving, is crucial for any transmission's longevity. 

Are 8-speed transmissions reliable?

An 8-speed transmission's reliability depends on the specific model and manufacturer, with some like the ZF 8HP being highly regarded for durability, while others, such as certain GM 8-speed transmissions, have faced significant issues. Reliability is strongly tied to proper maintenance, as fluid degradation can cause problems like harsh shifting or shuddering in both reliable and less reliable designs. 
Highly reliable 8-speed transmissions

• ZF 8HP: Widely praised for its fuel efficiency and performance.
  • Strengths: Generally durable and well-engineered, often lasting well over 150,000 miles with proper care.
  • Common issues: Problems are often caused by neglected maintenance, such as not changing the fluid as recommended, leading to leaks, solenoid issues, or harsh shifting. Some manufacturers incorrectly claim a "lifetime fill" for the fluid. 

Less reliable 8-speed transmissions 

• GM 8L90 and 8L45: These transmissions, used in models from roughly 2015 to 2019, have been the subject of lawsuits and widespread complaints.
  • Common issues: Reports of harsh shifting, shuddering, jerking, and hesitation.
  • Cause: These issues were linked to problems with the transmission fluid and internal components.
  • Resolution: GM addressed these issues through service bulletins recommending a fluid change and has since updated its designs. 

Factors affecting 8-speed transmission reliability

• Maintenance: Many problems are caused by a lack of proper fluid changes, which can lead to internal damage over time. 
• Software: In some cases, a transmission control module (TCM) software update can fix minor shifting issues. 
• Vehicle-specific design: The overall design of the transmission and how it's used in a particular vehicle can impact reliability. 

Which is better, 8-speed or 10-speed?

A 10-speed transmission offers better fuel economy and acceleration than an 8-speed by using more gear ratios to keep the engine in its optimal power band, while an 8-speed can provide quicker acceleration with aftermarket upgrades like a higher stall torque converter. The 10-speed has a wider range, providing both strong acceleration and efficient highway cruising, though some 8-speeds are praised for performance and reliability, particularly with certain manufacturers like ZF. 
This video compares the performance of a 10-speed vs 8-speed transmission: 1mTHE INCREDIBLE JOEYouTube · Jul 11, 2019
8-speed transmission

• Pros:
  • Often more durable in high-horsepower applications when built for aftermarket use. 
  • Can accelerate faster from a standstill with proper aftermarket torque converters. 
• Cons:
  • Some models have been criticized for poor shift quality, like shuddering or lagging, as seen in some GM 8-speed transmissions. 
  • Less efficient than 10-speed due to fewer gears to optimize engine RPMs. 

10-speed transmission 

• Pros:
  • Superior fuel efficiency and acceleration for everyday driving due to smaller gaps between gear ratios. 
  • Provides a wider overall gear ratio range to optimize for both performance and efficiency. 
• Cons:
  • Some models can be complex and may have tuning difficulties. 
  • Can sometimes have a "hunting" issue where it shifts back and forth between gears. 

Which one to choose

• Choose an 8-speed if:
  • You are building a high-horsepower drag car and will be upgrading the transmission. 
  • You prefer the feel and specific performance characteristics of a particular 8-speed, like the ZF. 
• Choose a 10-speed if:
  • You prioritize fuel efficiency and smooth, quick acceleration for daily driving. 
  • You want the latest technology for a modern vehicle.