Difference Between TH350 and TH400: Choose the Right One for Your Vehicle.

Published by Dustin Babich on

The key difference between th350 and th400 is the number of gears, as th350 has three and th400 has four. Th400 can handle more power and torque, but th350 is lighter and has better fuel efficiency.

Th350 and th400 are a type of automatic transmission used in general motors vehicles. While the number of gears is the most significant difference, there are other variations. For example, th400 typically has a longer tail shaft, making it less maneuverable.

Th350 also has a lock-up torque converter, which improves fuel economy. As they are both older models, they may not be as efficient or reliable as more modern transmissions, so it is important to consider the specific needs of the vehicle before deciding which one to use. Overall, both options have their pros and cons, but th400 is generally seen as more durable and suitable for higher power applications.

Th350 Transmission

The th350 transmission is a popular choice for car enthusiasts due to its affordability and durability. It’s a three-speed automatic transmission that was introduced by general motors in the 1969 model year. The th350 has a simpler design compared to its counterpart, the th400.

This makes it lighter and easier to install and maintain. One of the main pros of using a th350 transmission is its ability to handle up to 450 horsepower. However, it may not be the best choice for heavy-duty towing applications.

You’ll want to take into account the type of vehicle you have, as well as your specific driving needs, before making a decision. When compared to other transmission types, the th350 is often preferred for its ease of use and cost-effectiveness.

It’s compatible with a wide range of vehicles, making it a versatile choice for many car owners.

Th400 Transmission

The th400 transmission is a popular option for those seeking a dependable and powerful transmission for their vehicle. This transmission was created to handle high horsepower and torque levels, making it a great choice for those who have modified their cars for racing or other high-performance applications.

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Some of the advantages of the th400 transmission include its durability, ease of maintenance, and ability to handle high horsepower. However, there are also some downsides to using this type of transmission, such as its weight, cost, and potential reduction in fuel economy.

When comparing the th400 to other transmission types, it’s important to consider the specific needs of your vehicle and driving style. If you’re looking for a transmission that can handle high horsepower and torque and is compatible with a wide range of vehicles, the th400 might be the right choice for you.



Differences Between Th350 And Th400 Transmissions

Th350 and th400 transmissions are commonly used in vehicles, but they have distinct differences. The th400 is heavier and can handle more torque, making it suitable for high-performance applications. On the other hand, the th350 is lighter and more efficient, making it a better choice for everyday driving.

In terms of specifications, the th400 has a larger diameter output shaft and a deeper transmission pan. When it comes to performance, the th400 has a lower first gear ratio, allowing for more torque off the line. To choose the right transmission, consider factors like the intended use of the vehicle and engine specifications.

It’s also important to understand torque converter stall speed, which affects how the vehicle performs at low speeds. By making an informed decision based on these factors, you can ensure that your vehicle runs smoothly and efficiently.

Common Myths And Misconceptions

There are several misconceptions about the th350 and th400 transmissions that have been floating around for quite some time. One of the most common myths is that the th400 is always the better choice over the th350. However, this is not at all accurate, as the two transmissions are different and suitable for different purposes.

Another common myth is that the th350 can’t handle high horsepower engines, but this is not true either. The smart approach is to do comprehensive research on both transmissions and base your decision on facts instead of rumors. Make sure to pick the transmission that suits your particular needs and requirements.

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It is always important to dive deep into the subject and not make any assumptions when decoding crucial information about your vehicle.

Frequently Asked Questions On Difference Between Th350 And Th400

What Is The Difference Between Th350 And Th400?

The th350 has 3 gears, th400 has 4. Th400 can handle more torque and power.

Which Is Better For Racing, Th350 Or Th400?

Th400 is better for racing due to its 4 gears, able to handle more power and torque.

Can Th350 And Th400 Parts Be Interchanged?

Some parts can be interchanged between th350 and th400, but not all. Consult a professional.


There are several differences between th350 and th400 transmission systems. The most notable difference is that th400 has three gears, making it more powerful and ideal for towing heavy-duty vehicles. On the other hand, th350 is known for its compact size and lightweight design, making it more efficient for everyday driving.

Knowing these differences can help you make an informed decision when choosing a transmission system that best suits your needs. Another factor to consider is the cost of both transmission systems. While th350 is less expensive compared to th400, it’s essential to keep in mind that repairs and maintenance costs may vary depending on the type of vehicle and driving habits.

It’s crucial to consult an expert to establish which transmission system is the best for your specific needs. Which transmission system you choose between th350 and th400 will ultimately depend on factors such as vehicle type, intended use, and budget.

Nonetheless, with careful consideration of these factors, you can make the best decision for your vehicle while ensuring optimal performance and longevity.


Dustin Babich

Dustin Babich

Dustin Babich

As the passionate author behind Automotivesimple.com, Dustin Babich is a knowledgeable expert in all things automotive. With a deep understanding of car tools, equipment, engines, and troubleshooting techniques, Dustin Babich shares invaluable insights, practical tips, and effective solutions to empower readers in overcoming car-related challenges.


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