Tremec’s new powerhouse
With a sleek all-new case.



TREMEC TKX a 5-speed RWD manual transmission developed solely for the aftermarket.

For the development of the new transmission, TREMEC engineers took a forward-looking approach to find the best and most efficient solution. This included universal packaging, excellent shifting performance, and extreme durability.

The result is superior shift-ability with smooth shifts at high RPMs using multi-cone synchronizers and hybrid synchronizer rings. At the same time, noise, vibration, and harshness (NVH) performance are optimized with a gear layout to best control stress levels, while providing structural stiffness with a ribbed, 3-piece aluminum housing.
Durability is further optimized with oversized gear widths, gaskets at all flanges, and caged needle bearings in all gear positions.

Whether restoring or upgrading a classic muscle car or a 1930s-era roadster coupe, the new TREMEC TKX 5-speed RWD manual transmission delivers a top-quality drivetrain solution.

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the TKX offers an impressive array of flexible features.

  • An all-new end loading design.
  • End loading design eliminates top cover & provides superior strength
  • A rounded low-profile case for excellent tunnel clearance
  • 8000 RPM shifting & 600lbs/ft. torque capacity
  • Ford & GM Bellhousing pattern & input configurations
  • Rear main-shaft support bushing moved from tail closer to the gearbox provides better support.
  • New smaller stamped steel mid-position cover with 4 M6 x 18 countersunk socket screws.
  • Sintered carbon + bronze hybrid synchro rings with a non-leaning edge profile like the T56 Magnum.
  • New neutral switch location on the right side of the TKX with a plunger pin to connect with the rail selector.
  • Wider gear faces for easier torque handling.
  • Electric and traditional cable drive and analog OSS speedo sensors, Digital VSS available.
  • Multiple shifter locations.





Far and away, the most versatile 5-speed on the market.

TREMEC’s TKX the latest innovation to the series of 5-speed transmissions that began with its successful TKO in the 5-liter Mustang movement and has since been fitted into nearly every rear-wheel drive performance application imaginable.


Serving up 600 lb-ft of torque capacity, along with up to 8000 RPM confidence-inspiring shifts and fuel-saving overdrive.

The TKX offers an ideal blend of brute strength and street manners – which may be why its original design TKO series manual transmissions are behind more boulevard-bruising street machines and sportsman race victories than all of its competitors combined.

It’s the take no prisoners gearbox that started a revolution and has now evolved into what is TKX.



TKX is the next generation in five speeds, with its ALL NEW End Loading Design which provides such advantages as a slimmer case design for great tunnel clearance, increased case strength, and fewer case seams.

All this and 8000 RPM shifting & 600lbs/ft. torque capacity

    –   For wide-ratio Transmission please See MD-501-18085  – OR –  MD-501-18083 for a 10-spline version 


Product Features

Sintered carbon/bronze-Hybrid triple cone synchro’s
with a non-leading tooth profile

  • All new Slim End loading case designed for superior strength and greater tunnel clearance.
  • Sintered carbon/bronze-Hybrid triple cone synchros with a non-leading tooth profile
  • Close gear ratio (2.87, 1.89, 1.28, 1.00, .68) high-performance applications Rated at 600+ft/lbs
  • Utilizes Ford TKO bolt pattern 7.2″ length input shaft (with a short input shaft option can be bolt to a Ford close pattern 3-4 speed bellhousings )
  • 26-spline input shaft with a 31 spline output shaft for added strength.
  • Ford .670 pilot tip and 1.430″ OD throwout bearing guild tube. 
  • Robust design with an internal 3-rail shift system & steel shift forks.
  • All gears & shafts are made from special grade steel (ASTM 4615) providing increased torque carrying capacity.
  • Single-piece countershaft provides an increased torque carrying capacity
  • Tapered roller bearings on input, output, and counter shafts improve performance (reduced noise factor) with caged needle bearing on the main shaft. 
  • Equipped with a high-performance short-throw billet aluminum shifter that isolates road noise, while providing clean crisp shifts. 
    (Optional offset MDL shifter available for even more custom fit)
  • New smaller mid-position shifter mounting base reduced footprint
  • Built-in reverse light switch on the left side
  • Cruise control safety switch location on the right side of the TKX.
  • The rear main-shaft support bushing moved from the tail closer to the gearbox provides better support.
  • All mating surfaces are sealed with gaskets

If you are making over 400 hp and need an update from your four-speed this is the transmission for you.

TKX offers even more:

  • Three shifter locations are standard. (For the Mid position, an additional kit is required)

  • Ford Mechanical 7 tooth speedometer cable drive gear
  • OSS two-wire Analog speedometer sensor built-in.  
  • Reduce engine rpm to a level that makes it fun to drive besides enhancing fuel efficiency.


Lubricant Specifications

For all Tremec TKX 5-Speed models, the recommended oils are
Amzoil ATF or Synchromesh
Tremec High-Performance manual transmission Fluid (HP-MTF)
GM Synchromesh
Mobil 1 Synthetic ATF.

Fluid capacity is 2.7 quarts / 2.6 Liters.




FORD Gear Ratios Spline count
Item # 1st 2nd 3rd 4th 5th Input output
TCET17765 2.87 1.89 1.28 1.00 0.68 26 31
TCET18084 2.87 1.89 1.28 1.00 0.81 26 31
TCET18085 3.27 1.98 1.34 1.00 0.72 26 31
TCET18086 3.27 1.98 1.34 1.00 0.72 10 31


Fits GM A-Bodies without tunnel modification  –  Chevelle / GTO / Cutlass / Nova /
ALL NEW Endloading design which means, Greater Strength, Eliminates leaks



TREMEC’s design and development activities are based on system-wide integration and expertise in gears, shafts, bearings, synchronizers, and shift mechanisms as well as knowledge of materials and processes that can contribute to the best torque-to-weight ratio on the market.
TREMEC engineers continually improve the physics of gear design — of multiplying torque or speed, transmitting torque between axles, and reversing direction—but at ever higher efficiency, lower mass and space, lower noise, and higher durability.
The result is that raw materials enter TREMEC’s on-site forging facility at one end and emerge as robust, superior-quality products from the heavily automated plant on the other.