64-67 GM A-BODY MDL Modified Tremec TKX 5-Speed/ .72-OD.


MDL modifications bring the shifter stub up in OE position
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.
Not available through TREMEC.



Click here to see what’s different


Available on backorder



What do we do to the TKX:

The shifter is a close-ratio custom-made piece that is now an integral part of the transmission.
We achieve this by carefully machining, updating, and integrating new pieces to this HOT NEW must-have transmission
This is not available through TREMEC.
Many hours of R&D were put forth to provide this to you our customer.
No upgraded TKX leaves here unless it’s right.

Click here to see what’s different

Fits: Chevelle, GTO, Lemans, 442, Buick-GS, Malibu A-BODY 1964-1967

Gear Ratios 3.27, 1.98, 1.34, 1, .72od
26 spline input, 31 spline output

 **  BOP applications for upgrading a 3 or 4-speed manual car to a 5-speed **
**  If your BOP is automatic or has an auto or blank floor console  **


Video series deep dive install TKX 5-speed into a beautiful 67 A-Body


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

part 1 of a 5 part Video series deep dive install on a beautiful 67 Chevelle

Product Features

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

  • 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 Rated at 600+ft/lbs
  • Utilizes Ford TKO bolt pattern 7.2″ length input shaft
    (with a short input shaft option can bolt to:
    GM close pattern 3-4 speed bellhousings )
  • 26-spline input shaft with 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) 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.
  • 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 completely 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, additional kit 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