MDL Modifed Shift Position Tremec TKX 5-Speed for 1968-1982 C3 CorvetteMDL mods bring shifter stub up in OE position
Application:
1968-1982 - C3 Chevrolet Corvette
Features:
If you are making over 400-hp and need an update from your four-speed this is the transmission for you.
Click on the link below to see the install article by Jim Smart
Brute Tested Tough TKX5-Speed Performance for your 1963-1982 C2 / C3 Corvette
MDL mods bring shifter stub up in OE position
The shifter is a close-ratio custom-made piece that is now an integral part of the transmissionthis is an upgraded transmission, this isnt 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.
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 powerhouse transmission
Not available through TREMEC.
No upgraded TKX leaves here unless its right.
Application:1968-1982 - C3 Chevrolet Corvette
Features:
- Gear Ratios 2.87, 1.89, 1.28, 1, .81 od
- 26-spline input, 31-spline output shaft for added strength.
- a slim case design for great tunnel clearance
- increased case strength, and fewer case seams than TKO.
- 8000 RPM shifting & 600lbs/ft. torque capacity
- Sintered carbon/bronze-Hybrid triple cone synchros...with a non-leading tooth profile.
- 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)
- GM .590" pilot tip and 1.375" OD throwout bearing guide 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
- OSS two-wire Analog speedometer sensor built-in.
- 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. 208-453-9800
Experience the MDL difference:
When you purchase a complete MDL Conversion Package you get- We extend the manufacturers warranty by an extra year with a 1-year grace period.
- We have the best in the industry customer service.
- life-time technical support.

Lubricant Specifications:
For all Tremec TKX 5-Speed models, the recommended oils are:- Amzoil ATF
- Tremec High-Performance manual transmission Fluid (HP-MTF)
- GM SynchromeshMobil 1 Synthetic ATF.
- Your preferred brand of DEX 3 transmission Oil
Fluid capacity is 2.7 quarts / 2.6 Liters.

When you purchase a complete MDL Conversion Package you get
- We extend the manufacturers warranty by an extra year with a 1-year grace period.
- We have the best in the industry customer service.
- life-time technical support.

Lubricant Specifications:
For all Tremec TKX 5-Speed models, the recommended oils are:
- Amzoil ATF
- Tremec High-Performance manual transmission Fluid (HP-MTF)
- GM SynchromeshMobil 1 Synthetic ATF.
- Your preferred brand of DEX 3 transmission Oil

Click on the link below to see the install article by Jim Smart