Can a 4AT Transmission Be Upgraded to a 6AT?
2 Answers
4AT transmission cannot be upgraded to 6AT unless the entire transmission is replaced. The transmission is a mechanism used to alter the speed and torque from the engine, capable of fixing or changing the gear ratio between the output and input shafts, also known as the gearbox. The transmission consists of a gear transmission mechanism and a control mechanism, with some vehicles also featuring a power output mechanism. Most transmission mechanisms use ordinary gear transmission, while some employ planetary gear transmission. Below is an introduction to IVT and CVT transmissions: 1. CVT Transmission: The CVT transmission can achieve continuously variable transmission over a wide range, enabling optimal matching between the drivetrain and engine conditions. By continuously adjusting the transmission speed to suit various vehicle speeds, the engine can operate under optimal conditions for extended periods, thereby improving combustion efficiency and fuel economy. 2. IVT Transmission: The IVT transmission is a type of continuously variable transmission capable of handling larger loads, known as the Infinitely Variable Transmission (IVT). This transmission was first developed and patented by the UK-based Torotrak company.
I've discussed this topic from a maintenance perspective. Upgrading from a 4AT to a 6AT sounds appealing, but the actual process is highly complex. You'd need to replace the entire transmission since the gear sets are completely different. Then, you'd have to recalibrate the vehicle's electronic control unit to match the new transmission. These tasks require specialized equipment, and even modification shops might hesitate to take them on. The cost can easily exceed tens of thousands, far surpassing the value of an old car, and the risks are significant—if not done properly, the drivetrain could malfunction, making the vehicle unsafe to drive. My advice is to first check if the existing 4AT has any issues, such as changing the fluid or filter, which can extend its lifespan. If you're really after more gears, it's better to look for a used car with a 6AT—less hassle and more cost-effective. Vehicle stability is paramount; don't risk it for a slight improvement in fuel efficiency.
