68-72 Buick 5 & 6 SPEED CONVERSIONS


Category: SKU: 68-72 Buick Skylark GS/GSX 5 & 6 SPEED CONVERSIONS










Offers  five and six-speed conversions for
Small Block,  Big Block & LS swapped
 Buick GS, Skylark, GSX.
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 the OE position

Click here to see what’s different

Due to the popularity of this item
We ask that you please call for availability. 208-453-9800


  • 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.

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

This kit allows you to use your existing 166 tooth-capable bell-housing, flywheel with 11″ clutch pattern, stock clutch pedal, and mechanical clutch release.

You will also use your existing transmission cross-member.

Tunnel modifications are required 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.

  • 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 ones if you don’t have to.

You will have to select a clutch matched to your horsepower & use.

Check out our HOW TO page, just click this link

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


We offer complete conversion packages for Ford & GM featuring the NEW TKX


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 U.S.A. made Lightened Billet Steel Flywheel
  • S. 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

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 & after the order service.

Components are IN-STOCK.


Click or call for a customized quote for your requirements.