The TREMEC TKX 5-speed transmission is a high-performance manual transmission launched in 2020 to replace the popular TREMEC TKO 5 Speed transmission. The TKX is designed for a wide range of applications and is the first transmission TREMEC has made specifically for the automotive aftermarket. At American Powertrain we are experts at making TREMEC manual transmissions fit in your car. All of the applications we had TREMEC TKO kits for, have transitioned to TKX kits.

Here are some of the key features and benefits of the TREMEC TKX 5 Speed Transmission:

Gear Ratios

The TKX transmission features a wide range of gear ratios, including a 2.87:1 first gear ratio, a 1.89:1 second gear ratio, a 1.28:1 third gear ratio, a 1:1 fourth gear ratio, and a 0.68:1 fifth gear ratio. This allows for excellent acceleration and improved fuel efficiency at cruising speeds. Full gear ratio options below:

Part NumberStyleTorque RatingInput Spline1st2nd3rd4th5thR
TCET18086Ford600 lb-ft103.271.981.3410.723
TCET18084Ford600 lb-ft262.871.891.2810.812.56
TCET17765Ford600 lb-ft262.871.891.2810.682.56
TCET18085Ford600 lb-ft263.271.981.3410.723
TCET18083GM600 lb-ft263.271.981.3410.723
TCET17722GM600 lb-ft262.871.891.2810.812.56
TCET17805GM600 lb-ft262.871.891.2810.682.56

Torque Rating

The TKX transmission has a maximum torque rating of 600 lb-ft, which makes it suitable for high-performance engines. This means it can handle a lot of power without risking damage to the transmission.

Shift RPM

The TKX transmission allows for smooth and precise shifts at a wide range of RPMs up to 7000 RPM. This means you can shift gears quickly and easily without losing momentum or experiencing jerky transitions.

Helical Gears

The TKX transmission features helical gears, which help reduce noise and vibration. Helical gears are quieter than straight-cut gears, which is important in high-performance applications where noise can be a distraction.

Compact Design

The TKX transmission has a compact design, which makes it easy to install in a wide range of vehicles. This is especially important for classic car restorations or engine swaps, where transmission tunnel space is often limited.

Improved Shift Quality

The TKX transmission features improved shift forks and synchronizers, which provide smoother and more precise shifts. This means you can shift gears quickly and easily without worrying about missing a gear or grinding the gears.


The TKX transmission is built to withstand the demands of high-performance driving. It features high-strength gears, bearings, and shafts, which are designed to last for many miles without requiring maintenance or repairs.

The TREMEC TKX 5-speed transmission offers a wide range of features and benefits that make it an ideal choice for high-performance applications. With its wide range of gear ratios, high torque rating, smooth shifting, smaller case and durable construction, the TKX transmission is a reliable and efficient option for any high-performance vehicle. At American Powertrain, we offer TKX transmission swap kits for almost any American Musclecar, Classic Truck, kit car or Custom street rod. Shop transmissions and kits or fill out a request for quote below.

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