Offers  five and six-speed conversions for BOP
Small & Big Block & LS swapped Buick GS, Skylark.

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.

The MDL side-shift program brings the TKX shifter stub up in OE position




TKX Five Speed Single Overdrive Conversion up to 750hp

We offer complete conversion packages for Buick Olds & Pontiac featuring the NEW TKX


For higher torque applications or you’re a ‘spirited driver,’
the TKX series five-speed is the latest offering from Tremec


The MDL side-shift program brings the TKX shifter stub up in OE position

Check out these stats.

Rated for 600lb/ft of torque, will support shifting up to 8000rpm
Thanks to triple cone hybrid sintered synchronizers the Tremec T56 Magnums have to make your driving experience the best.

The new end loading design makes for a stronger case with a new sleeker profile, eliminating top covers, that would have restricted room in the tunnel.


Click here to read more about the TKX


V8 Speed & Restoration Shop talks about installing the TKX and its benefits



Below you can see the differences between the TKO & TKX cases



The TKX offers a little more adjustment at the tail shaft vertically for the driveline angle.
Perfect for Pro-Streeters who love to tuck the rear suspension up into their ride.

The MDL conversion packages are as complete as possible.
You get ALL the components you need whereas competitors’ packages provide only the basics.
When comparing costs be sure you are comparing apples to apples on the contents, and quality & especially after the order service.

MDL is a stocking distributor and most parts are ready to ship.


  • Increase in fuel economy with overdrive.
  • Lower RPM’s 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.

Experience the MDL Difference,

  • We extend the manufacturer’s warranty by an extra year…
    and add a 1-year grace period.
  • We offer the best in the industry customer service.
  • When you purchase a complete MDL Conversion Package you get, lifetime technical support.
  • You will need to select a clutch matched for your horsepower & use. Need Help… give us a call.
  • We will use any existing parts you have that we can… there’s no need to buy new if you don’t have to.

has Kits for the customer that already has usable 3 or 4-speed Muncie or Saginaw transmission components in their Buick.

This kit allows you to use your existing bell-housing, flywheel with an 11″ clutch pattern, stock clutch pedal, and mechanical clutch release.

You will also use your existing transmission cross-member.

We can help select a clutch matched to your horsepower & use.

Tunnel modifications are required for 6-speed applications and the sheet metal tunnel patch is included in this kit

Whether you are converting from Auto to manual or just want an upgrade, we have a solution for you.
We can supply everything you need from the back of the block to the driveshaft.

You get all the parts you need and none you don’t


Check out our HOW TO page, just click this link

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


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

TREMEC 5 or 6-Speed Transmission with Shifter


  • All Fastening Hardware including ARP
  • Aluminum or ‘QuickTime’ Steel Bell-housing
  • Superior Diaphragm Clutch or McLeod or Tilton Twin-Disk matched to your horsepower and usage.
  • Modern Driveline US. made Lightened Billet Steel Flywheel
  • US. made Steel Cross-member
  • Transmission Mount
  • Wiring Harness & Plugs
  • Shift Ball & Lever and Boot
  • Hydraulic Master and Slave clutch linkage
  • Synthetic Automatic Transmission Fluid
  • High-Speed Precision Balanced Aluminum or Steel Driveshaft
  • Detailed Installation Instructions and Lifetime Tech Support



A little Buick Muscle car history