Complete Automatic Transmissions

Is your original automatic transmission worn out, or does it need to handle more torque after tuning the engine? In this category we bring together complete, fully built automatic transmissions and packages with torque converter for diesel vehicles and high-power projects. That way you replace the entire unit in one go.

What do you get with a complete automatic transmission?

A complete unit replaces the entire transmission, so you don't have to rebuild the original internally. Some packages come with a torque converter, e.g. BD Diesel's Trackmaster 68RFE packages for RAM 2500/3500 with 6.7L Cummins. Others are divided into stages, e.g. ATS Diesel's 47RE and 545RFE packages in Stage 2 and Stage 5. At FTI Performance you'll find, for example, a TH400 in Level 4.5 rated at 1100HP, Sportsman transbrake and a choice between GM Ultrabell and SFI bellhousing.

How to choose the right transmission

• Vehicle and model year: The packages are built for specific models and years, e.g. 07-18 or 19-24 RAM.
• 2WD or 4WD: The same transmission type is often available in both versions, and they are not necessarily interchangeable.
• Torque and use: Choose the stage based on engine torque, boost pressure and whether the vehicle is used for towing, street or track. What each stage includes is stated in the product description.
• Torque converter and control: Check whether a converter is included and whether the vehicle requires adjusted shift control.

Installation typically requires a lift and experience with drivetrains. Use fluid according to the manufacturer's specification, and keep an eye on the transmission cooler, as high fluid temperature can shorten service life. If you're looking for individual parts instead, you can browse the full category of automatic transmissions.

Frequently asked questions

What is the difference between Stage 2 and Stage 5?

The stages indicate different build levels in ATS Diesel's packages. Exactly which components and which torque limit a stage includes depends on the specific package and is stated in the product description. Choose based on engine torque and how the vehicle is used.

Do I need a new torque converter with the transmission?

It depends on the package. Several come with a converter matched to the transmission. A converter that doesn't suit the transmission and the engine's output can affect shift quality and increase heat build-up, so follow the manufacturer's recommendation.

Does a new automatic transmission require inspection or approval?

It depends on the product and the vehicle. Changes to the drivetrain may require documentation or an inspection. Check the documentation for the specific part number, and confirm with an inspection authority before installing the transmission in a registered vehicle.