BOP MDL Modified Tremec TKX 5-Speed/ .72-OD.


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

Click here to see what’s different

Video series deep dive install on a beautiful 67 A-Body



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 updating and integrating new pieces to
this  must-have transmission
Not available through TREMEC

Fits: Chevelle, GTO, Lemans, 442, Buick-GS, Malibu

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


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

Click here to see what’s different


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 (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 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)
  • A new smaller mid-position shifter mounting base reduced the footprint
  • Built-in reverse light switch on the left side
  • The cruise control safety switch is located 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.

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


Gear Ratios

Spline count

Item #


2nd 3rd 4th 5th Input




1.89 1.28 1.00 0.81 26




1.89 1.28 1.00 0.68 26




1.98 1.34 1.00 0.72 26



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.
  • lifetime technical support.

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
  • 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
Tremec High-Performance manual transmission Fluid (HP-MTF)
Mobil 1 Synthetic ATF.

Fluid capacity is 2.7 quarts / 2.6 Liters.

Fluid Maintenance LINK for Tremec Transmissions



Additional information

Weight 1936 oz
Dimensions 48 × 14 × 18 in




TKX Service Manual_04.05.2021


TKX Parts Manual_04.05.2021


TKO / TKX Oil info