CORVETTE 68-82 MDL Modified Tremec TKX 5-Speed/.72 OD.


Due to the popularity of this item
We ask that you please call for availability. 208-453-9800

Gear ratio 2.87, 1.89, 1.28,1,  .68-od
26 spline input, 31 spline output Shafts
Mechanical and Analog Electric speedo drive
Torque rated for 600ft/lbs/ 8000rpm shifting
MDL mods bring the shifter stub up in OE position

Click here to see what’s different




The shifter is a close-ratio custom-made piece that is now an integral part of the transmission
this is an upgraded transmission, this isn’t just a bolted-on shifter.
They are all prepared at our facility by hand to ensure quality & precision.
Many hours of R&D were put forth to provide this to you our customer.

No upgraded TKX leaves here unless it’s right.

What do we do to the TKX:

MDL modifications bring the shifter stub up in OE position
We achieve this by carefully machining, updating, and integrating new pieces to 
this HOT NEW must-have transmission
Not available through TREMEC.


C3 1958-1982 –  Chevrolet Corvette

MDL mods bring shifter stub up in OE position


Gear Ratios 3.27, 1.98, 1.37, 1, .72 od
26 spline input, 31 spline output

click on the link below to see the installation article by: Jim Smart

TKX Performance for C2/C3 Corvette


Reserve yours now… call us for details & availability  208-453-9800


TKX is the next generation in five speeds
With  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

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


Product Features


  • Sintered carbon/bronze-Hybrid triple cone synchro’s
    with a non-leading tooth profile.
  • Close gear ratio (3.27, 1.98, 1.34, 1.00, .72) high-performance applications
  • Utilizes GM TKO bolt pattern & 7.2″ length input shaft
    (with a short input shaft option you can bolt to:
    GM close pattern 3-4 speed bellhousings)
  • 26-spline input shaft & a 31 spline output shaft for added strength.
  • GM  .590 pilot tip and 1.375″ 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) for the increased demands of today’s engines.
  • Single-piece countershaft provides an increased torque carrying capacity.
  • Tapered roller bearings on input, output & counter shafts improve performance
    ….(reducing noise factor) with caged needle bearing on the main shaft. 
  • Equipped with an MDL high-performance short-throw billet aluminum shifter that isolates road noise, while providing clean crisp shifts. 
    …..(See more detail on the MDL shifter here)
  • 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.
  • 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.

We offer complete TKX five-speed packages
That are totally customizable.
Contact us today for a detailed quote.



Experience the MDL difference:

When you purchase a complete MDL Conversion Package you get

  • We extend the manufacturer’s warranty by an extra year… with a 1-year grace period.
  • We have the best in the industry customer service.
  • life-time technical support.

TKX offers even more:

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

  • Ford Mechanical 7 tooth speedometer cable drive gear
  • The reluctor wheel is 17 tooth.
  • 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.


Additional information

Weight 1936 oz
Dimensions 48 × 14 × 18 in









TKO / TKX Oil info

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