When considering the best transmission for a C10 with a 350 engine producing 440 horsepower, there are a few factors to consider, such as the intended use of the vehicle, personal preferences, and budget. However, a common choice for a high-performance setup like this is the Tremec TKO-600 transmission.
The Tremec TKO-600 is a 5-speed manual transmission known for its strength and durability. It can handle the power output of a 440-horsepower engine while providing smooth shifts and improved fuel efficiency on the highway. It also offers overdrive, which can be beneficial for reducing engine RPM at cruising speeds, resulting in better fuel economy and a quieter ride.
If you prefer an automatic transmission, the GM 4L80E is a popular choice. It is a heavy-duty, electronically controlled 4-speed automatic transmission known for its strength and reliability. The 4L80E can handle the power and torque of a high-performance engine like the 350 with 440 horsepower.
Both the Tremec TKO-600 and the GM 4L80E should be able to handle the power output of your engine and provide reliable performance. However, it's important to consider other factors such as budget, availability, and personal preference when selecting the best transmission for your specific needs. Consulting with a knowledgeable transmission specialist or mechanic can also provide valuable insights and recommendations based on your requirements.