The TH350 transmission is a popular automatic transmission that was introduced by General Motors in 1969. It was used in many GM vehicles until 1986, and it is still a popular choice for many enthusiasts and hot rodders. One of the main features of the TH350 transmission is the lockup torque converter. In this article, we will discuss the differences between the TH350 lockup and non-lockup transmissions, their pros and cons, and which one is best for your application.
Contents
TH350 Lock up vs Non Lockup Transmission – What’s the Difference?
The main difference between the TH350 lockup and non-lockup transmissions is the torque converter. The lockup torque converter is designed to improve fuel economy by reducing the slippage that occurs in the torque converter at cruising speeds. The non-lockup torque converter does not have this feature.
Key Features of TH350 Lockup Transmission
The TH350 lockup transmission has several key features, including:
Lockup Torque Converter – The lockup torque converter is the main feature of the TH350 lockup transmission. It engages at cruising speeds to reduce slippage and improve fuel economy.
3-Speed Transmission – The TH350 lockup transmission is a 3-speed automatic transmission with a torque converter.
Durability – The TH350 lockup transmission is known for its durability and reliability, making it a popular choice for many enthusiasts and hot rodders.
Pros
Improved Fuel Economy – The lockup torque converter in the TH350 lockup transmission improves fuel economy by reducing slippage at cruising speeds.
Smooth Operation – The lockup torque converter also provides smoother operation and less heat buildup than a non-lockup torque converter.
Durability – The TH350 lockup transmission is known for its durability and reliability, making it a popular choice for many enthusiasts and hot rodders.
Cons
Added Complexity – The lockup torque converter adds complexity to the TH350 lockup transmission, which can make it more difficult to work on and maintain.
Cost – The TH350 lockup transmission can be more expensive than a non-lockup transmission due to the added complexity of the lockup torque converter.
Key Features of TH350 Non-Lockup Transmission
The TH350 non-lockup transmission also has several key features, including:
Non-Lockup Torque Converter – The TH350 non-lockup transmission does not have a lockup torque converter, which means there is more slippage at cruising speeds.
3-Speed Transmission – The TH350 non-lockup transmission is also a 3-speed automatic transmission with a torque converter.
Simplicity – The TH350 non-lockup transmission is simpler in design and does not have the added complexity of a lockup torque converter.
Pros
Simplicity – The TH350 non-lockup transmission is simpler in design and does not have the added complexity of a lockup torque converter.
Cost – The TH350 non-lockup transmission can be less expensive than a lockup transmission due to its simpler design.
Availability – The TH350 non-lockup transmission is more readily available than the lockup transmission, which can make it easier to find and purchase.
Cons
Reduced Fuel Economy – The non-lockup torque converter in the TH350 non-lockup transmission does not improve fuel economy like the lockup torque converter does.
Heat Buildup – The non-lockup torque converter can produce more heat and result in less smooth operation compared to the lockup torque converter
TH350 Lock up vs Non Lockup Comparison Table
To help you compare the TH350 lockup and non-lockup transmissions, here is a table of their key features:
| Feature | TH350 Lockup Transmission | TH350 Non-Lockup Transmission |
| Torque Converter | Lockup | Non-Lockup |
| Number of Speeds | 3 | 3 |
| Fuel Economy | Improved | Reduced |
| Smooth Operation | Improved | Reduced |
| Durability | High | High |
| Cost | High | Low |
| Availability | Limited | Widely Available |
| Complexity | High | Low |
| Heat Buildup | Low | High |
Which TH350 Transmission is Best for You?
The best TH350 transmission for you will depend on your application and goals. If you are looking for improved fuel economy and smoother operation, the TH350 lockup transmission may be the better choice.
However, if you want a simpler and more affordable option, the TH350 non-lockup transmission may be the way to go. It’s important to consider your budget, intended use, and any modifications you have made to your vehicle when making your decision.
Conclusion
In conclusion, the TH350 lockup and non-lockup transmissions each have their own unique features and benefits. The lockup transmission provides improved fuel economy and smoother operation but comes with added complexity and cost. The non-lockup transmission is simpler and more affordable but may require modifications to improve fuel economy.