Offers  five and six-speed conversions for
Small Block,
LS swapped or Big Block, and even Gassers  C-1 Corvettes
Our line of products offers simple ways to upgrade your 3 or 4-speed
to a Tremec five-speed or a complete automatic to five or six-speed overdrive.
We have you covered.


  • Increase in fuel economy with overdrive.
  • Lower RPMs for more drive-ability and a much quieter in-car feeling. 
  • Reduce wear on your engine & drive-train parts
  • Reduce engine temperatures, promoting a longer-lasting engine.


  • We extend the manufacturer’s warranty by an extra year.
    And we add a 1-year grace period.
  • We offer best-in-the-industry customer service.
  • When you purchase a complete MDL Conversion Package you get, lifetime technical support.


TKX Five-speed Overdrive

Are you looking for an extra gear in your Corvette?
Modern Driveline has the solution for you

Tremec TKX single 5-speed
With either 18% or 36% overdrive.


MDL Corvette Specialty designed & engineered
Side Shift TKX.

Click here to learn more


Our Corvette TKX five-speed has been customized to fit in place of the Muncie four-speed.  With fresh stock body mounts, the TKX will clear the tunnel.
MDL’s side-mounted low-profile shifter places the lever in the stock location.
Unlike many other shifters of its kind, our shifter has the lowest profile that is rock-solidly mounted.
The shifter linkage remains enclosed keeping dirt out and allowing the oil to remain in the shift box.

The shifting quality is short and confident.
Corvette equipped with an M21 rock crusher the TKX will slip right in.
If not, we offer a complete line of 26 spline clutch sets for both Mechanical and hydraulic clutch releases.
At 600lb-ft of tire-melting torque capacity, there is not much this TKX can’t handle.

So from small blocks to the latest boost feed LS, the TKX will make your Corvette a boulevard bruiser.  

Click here to read more about GM TKX

MDL’s Corvette package
is as complete as you want it to be.

We don’t have prepackaged kits…  so you are NOT forced to purchase unwanted parts that go unused.
We listen to our customers, discuss their projects, and provide a custom quote that meets your needs.

Our packages can include everything from the crankshaft back to the differential.
Our product line allows us to keep your Corvette-looking stock but perform like a modern-day muscle.
Only you will know the five-speed is there.


Available Gear Ratios 

GM TKX Gear Ratios Spline count
Item # 1st 2nd 3rd 4th 5th Input output
TCET17722 2.87 1.89 1.28 1.00 0.81 26 31
TCET17805 2.87 1.89 1.28 1.00 0.68 26 31
TCET18083 3.27 1.98 1.34 1.00 0.72 26 31


In just 15-20 Minutes, we will ask you a series of questions to build you a detailed quote for a TKX five-speed.

Solutions are TAILORED to your needs
With many or all of the following:

We will use any existing parts you have that we can… there’s no need to buy new ones if you don’t have to.

Need Help… give us a call.  208-453-9800


From our How to Series: How to get a soft pedal with our LF series hydraulics




Click here to see our Frequently Asked TECH-Questions/Answers page