The Chevrolet 350 small-block V8 engine, a legend in its own right, often finds itself paired with a variety of transmissions. But when it comes to performance and everyday drivability, the combination of a Chevy 350 and a turbo transmission is a popular and powerful choice. This article explores the nuances of this pairing, focusing on the different transmission types, their performance characteristics, and considerations for maintenance and upgrades.
Understanding the Chevy 350 Engine
Before diving into the transmissions, it's crucial to understand the powerhouse it's working with. The Chevy 350, a 5.7-liter V8, is known for its robust design, readily available parts, and massive aftermarket support. Its reliability and ease of modification have cemented its place in automotive history. This makes it an ideal candidate for various performance upgrades, including the addition of a turbocharger, significantly increasing its power output. This increased power demands a transmission capable of handling the added torque.
Turbo Transmission Options for the Chevy 350
Several automatic and manual transmissions can be paired with a turbocharged Chevy 350, each with its own strengths and weaknesses.
Automatic Transmissions:
- TH350: This three-speed automatic is a classic, known for its strength and relative simplicity. While not ideal for extremely high horsepower applications, a properly built TH350 can handle a moderately boosted 350. Upgrades like a shift kit and a higher stall torque converter are common modifications.
- TH400: A more robust three-speed automatic, the TH400 is known for its heavy-duty construction and high torque capacity. It’s a popular choice for high-performance applications and can withstand significantly more abuse than the TH350.
- 700R4/4L60E: These overdrive automatics offer improved fuel economy at cruising speeds compared to the older three-speed units. The 700R4 is the predecessor to the more common 4L60E, found in many GM vehicles. Both require careful consideration when used with a turbocharged 350 due to their relative fragility compared to the TH400. Upgrades like stronger internals and a higher stall converter are essential.
- 4L80E: This heavy-duty four-speed automatic is designed to handle massive amounts of torque, making it a top contender for high-horsepower turbocharged Chevy 350 applications. It's a popular choice for those seeking reliability and high performance.
Manual Transmissions:
- SM465: This heavy-duty four-speed manual transmission is a workhorse known for its durability and ability to withstand significant abuse. It's a popular choice for those seeking a robust and reliable manual transmission for their boosted 350.
- NV4500: A five-speed manual option, the NV4500 offers a wider gear ratio spread, providing better fuel economy on the highway while maintaining the strength necessary for high-torque applications.
Factors to Consider When Choosing a Transmission
Selecting the right transmission for your turbocharged Chevy 350 depends on several factors:
- Power Goals: How much horsepower and torque are you aiming for? Higher horsepower demands a more robust transmission.
- Budget: High-performance transmissions and upgrades can be expensive.
- Driving Style: Are you primarily using the vehicle for street driving, drag racing, or off-roading?
- Vehicle Application: The intended use of the vehicle will influence the choice of transmission.
Maintenance and Upgrades
Regardless of the chosen transmission, regular maintenance is vital for longevity. This includes regular fluid and filter changes, along with inspections for wear and tear. Upgrading clutches, torque converters, and other internal components is common to enhance the transmission's capacity to handle the increased power output of a turbocharged engine.
Conclusion
Pairing a turbocharged Chevy 350 with the right transmission is crucial for optimal performance and reliability. Careful consideration of the power goals, budget, driving style, and vehicle application will guide you towards the best choice. Remember, regular maintenance and potential upgrades will ensure your chosen transmission keeps up with the power demands of your boosted small-block.
