What is the TH350 transmission rated for?
The TH350 transmission, also known as the Turbo Hydramatic 350, is a highly popular automatic transmission developed by General Motors in the late 1960s. Renowned for its durability and versatility, it has been a staple in many GM vehicles, including muscle cars, trucks, and SUVs. In this article, we’ll explore the power rating of the TH350 transmission, its capabilities, and why it remains a favorite among car enthusiasts and mechanics alike.
Understanding the TH350 Transmission
The TH350 is a three-speed automatic transmission that was designed to handle a wide range of applications. It was introduced as a replacement for the Powerglide transmission and quickly gained a reputation for its robust design and reliability. With its cast aluminum housing and compact size, the TH350 became a go-to choice for both factory installations and aftermarket upgrades.
Power and Torque Ratings
The TH350 transmission is generally rated to handle up to 400 horsepower and 350 lb-ft of torque in its stock configuration. However, these ratings can vary depending on the specific build and condition of the transmission. For example, a well-maintained or professionally rebuilt TH350 can often handle slightly higher power levels, especially when paired with performance upgrades.
Factors That Affect the TH350's Performance
Several factors can influence the performance and durability of a TH350 transmission. Here are some key considerations:
- Condition of the Transmission: A worn or poorly maintained TH350 may not perform as well as a freshly rebuilt unit.
- Upgrades: Adding performance components such as a shift kit, heavy-duty clutches, or a higher-capacity torque converter can increase the transmission's power-handling capabilities.
- Application: The type of vehicle and driving conditions (e.g., street use, drag racing, off-roading) can also impact the transmission's performance.
- Cooling: Proper cooling is essential to prevent overheating, which can significantly reduce the lifespan of the transmission.
Why the TH350 Remains Popular
The TH350 transmission continues to be a favorite among car enthusiasts for several reasons:
- Versatility: It can be used in a wide range of vehicles, from classic muscle cars to modern hot rods.
- Aftermarket Support: There is a vast array of aftermarket parts and upgrades available for the TH350, making it easy to customize for specific needs.
- Ease of Maintenance: The TH350 is relatively simple to rebuild and maintain, even for DIY mechanics.
- Proven Reliability: Decades of use have demonstrated the TH350's ability to withstand demanding conditions.
Conclusion
The TH350 transmission is rated for up to 400 horsepower and 350 lb-ft of torque in its stock form, making it a reliable choice for a variety of applications. With proper maintenance and the right upgrades, it can handle even more power, ensuring its place as a trusted transmission for enthusiasts and professionals alike. Whether you're restoring a classic car or building a high-performance vehicle, the TH350 is a transmission worth considering.
Frequently Asked Questions
How much power can a TH350 handle?
The Stage 1 TH350 is rated up to 450 hp. Those seeking something a little stronger can check out the Stage 2 version (PN PA35102) that holds 550 hp and retails for $1,500 with a real world street price of $1,175 from most vendors.
Can you run a TH350 without kickdown cable?
Other than the convenience of automatic downshifts into passing gear at highway speeds, there's no real need for a simple kickdown cable on those transmissions like this TH350 that have a vacuum modulator.
How much HP can a TH350 handle?
The Stage 1 TH350 is rated up to 450 hp. Those seeking something a little stronger can check out the Stage 2 version (PN PA35102) that holds 550 hp and retails for $1,500 with a real world street price of $1,175 from most vendors.
What is better, turbo 350 or 400?
Both are three-speeds, but the Turbo 400 is physically larger and designed more for the torque capacity of big-block engines.
When did GM stop using TH350?
For the 1981 model year, a lock-up torque converter was introduced which coincided with the new EMC control of most GM cars; this version is the THM350-C, which was phased out in 1984 in GM passenger cars for the 700R4.
Can a TH350 handle 800HP?
Simple yet strong. We have an excellent track record with our TH350's. Deep into the 10's without failure, they have proven to be a very tough unit for a reasonable price. We feel they are a very good choice in cars up to 600 HP/TQ but capable of up to 800 HP/TQ especially in lighter cars.
Do I need the kickdown cable on a TH350?
Other than the convenience of automatic downshifts into passing gear at highway speeds, there's no real need for a simple kickdown cable on those transmissions like this TH350 that have a vacuum modulator.
What is the limit on the TH350?
I would normally say the limit for a TH350 is around the 800 Hp range. We've had them survive 700 RWHP for several seasons without issue.
What is the strongest GM transmission?
The 10L90E is by far the biggest and heaviest modern automatic transmission in GM history, but it's also the strongest and offers amazing performance and economy when matched with a Gen V LT engine. This is part of the newest technology in the performance world.
How much HP is a TH350 good for?
The Stage 1 TH350 is rated up to 450 hp. Those seeking something a little stronger can check out the Stage 2 version (PN PA35102) that holds 550 hp and retails for $1,500 with a real world street price of $1,175 from most vendors.
