69-70 Mustang 5 & 6 Speed Conversions


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69-70 Mustang 5 & 6 Speed Conversions by MDL are the most complete kits available.

Experience the MDL Difference:

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

T5 Five-Speed Single Overdrive Conversion

Modified Mustangs & Fast Fords article: T5 into ’69-70 Mustang

Inline Six-cylinder conversions

By 1967, Ford settled on the 3.03 three-speed with the wide pattern “Toploader” pattern.  The three-speed was budget-minded and were great in their day.
Fast forward to today, these same transmissions are worn out are in need of replacement.
The answer is a Tremec T5 five-speed with an overdrive.  This allows the Mustang to travel comfortably at highway speed in the mid-2,000 rpm range.
Installing a T5 into a classic Mustang is easy. 

Using most of the three-speed parts like the bellhousing, flywheel, and clutch linkage, all that is needed is a new conversion clutch, adapter plate, T5, crossmember, and a few other supporting parts.
No tunnel modifications are needed and the shifter location is retained.

If there are 2 starter bolts this means the flywheel is a 136 tooth with a 9″.  MDL has the T5 adapter plate that to make this conversion easy.

OK, your classic Mustang is equipped with an automatic.
MDL has a complete 69-70 Mustang 5 & 6 Speed Conversions to make this easy.
Our T5 conversion kit includes hard-to-find items like a new inline six-cylinder flywheel, conversion clutch, reproduction easy to install clutch pedal to the correct slip yoke for ready to bolt in the driveshaft, and everything in between.

V8 Conversions

Manual to Five Speed

Six bolt 289/302/5.0L equipped

Mid-year 1966 Mustangs were equipped with six-bolt blocks that carried through 302 and 5.0L HO of the ’90s.  With this change comes the wide pattern “Toploader” four-speed.
Modern Driveline’s adapter  MD-401-2102 bolts to the bellhousing to allow the Fox-body T5 to bolt right up using all the stock clutch linkage.   Another option to installing a T5 behind a six-bolt block is the fox body T-5 bellhousing.  With this bellhousing you don’t need an adapter plated and you can use a 157-tooth flywheel from the 3 or 4-speed.

With a T5 bellhousing you have three choices in the clutch linkage. Stock mechanical linkage, cable, or hydraulic.

The TKX will fit in a 69 Mach1 with Mild modifications. a slight trim of the top of the tunnel ring will do the trick

Mechanical linkage:

T5 bellhousing is designed for cable release and is deeper.  To install a mechanical fork, a  fulcrum kit is required to mount the fork.  The kit has a spacer to keep the fork in the same location.  MDL can pre-drill the mounting holes for you with our fixture to ensure the mounting hole location is current.

Cable clutch release:

Since T5 bellhousing is designed for a cable release, a matching fork is required. It is important to know the 3 or 4-speed mechanical release clutch can no longer be used as it will be too tall.
Modern DriveLine offers cable release clutches for the 10″ long pattern and the 10.4″ Metric bolt patterns.  The pressure plate lever height is lower and the release is faster.
Using the stock clutch pedal, MDL engineered a cable kit that bolts to the 69-70 Mustang pedal and comes complete with a firewall plate, and custom double adjustable cable. The cable is routed around the exhaust system down along the oil pan to the clutch fork.

Click here for more info on this

Hydraulic release:

We have developed a complete line of hydraulic clutch release systems we call our LF (Light Foot) Series.  The master cylinder mounts on the firewall using the mechanical linkage that connects to the stock clutch pedal.  The linkage provides proper leverage and control while providing design flexibility.  Using the T5 and cable fork, our external slave cylinder mounts the back of the bellhousing pushing the fork forward. Our hydraulic system provides the most exhaust clearance while providing the softest pedal effect.



Click here for more Hydraulic clutch info

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


If you are undecided as to which clutch release system is right for you, we can help you through the process of what’s right for you. 208-453-9800



TKX Five Speed Single Overdrive Conversion up to 750hp

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

Rated for 600lb/ft of torque, will support shifting up to 8000rpm
thanks to triple cone hybrid sintered synchronizers that 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.

The TKX will fit in a 69 Mach1 with Mild modifications. a slight trim of the top of the tunnel ring will do the trick

From the still photos below, you can see the clearance you can expect with a stock cross-member & mount.



To Shop TKX click here



The TKX offers a little more adjustment approx. 5/8″ at the tail shaft vertically for the driveline angle. Perfect for Pro-Streeters who love to tuck the rear suspension up into their ride.
This can be done by removing the factory spot welds and relocating the support back.
A great addition to the installation is the MDL Crossmember item# MD-6773M-CMTKO and a new mount, this will maintain the transmission angle as well as provide superior clearance for exhaust and a locating arm for your emergency brack cable.


To learn more about the new TKX click this link.

TKX Five Speed Single Overdrive Conversion

The big brother Five Speed.  Perfect for those of you running a high-powered small block or big block.
Tremec developed the TKX to be as much of a direct bolt-in replacement for the wide pattern Ford Toploader and input shaft features.
For early Mustang is best to keep the standard length TKX input shaft to keep the shifter back in the tunnel shift hole.  We do this by using a 3 or 4-speed bellhousing to TKX spacer or switch to a TKX bellhousings.

Modern Driveline Exclusive Solutions:

MDL offers a wide range of bellhousings for SBF, FE, 429 series blocks.  Tremec TKX’s are offered in two gear ratio gear sets.
The TKX comes with a wide-ratio 3.27:1 first gear with a .72:1 OD. OR a close ratio with a 2.87:1 first gear with a .68:1 or .81:1 OD.

For small blocks, the TKX will fit in the transmission tunnels with the use of an MDL TKX crossmember and standard top covers.
Since big blocks fit differently, it is best to use our low-profile top covers and low-profile cross member for additional clearance.

T56 Magnum Six-Speed Double Overdrive Conversion

Tremec’s Magnum Six-speed is the top of the heap when it comes to manual overdrive transmission with its brute strength of 700ft/lbs. tq and two overdrive ratios.
In order to fit a Magnum in a 69-70 Mustang the tunnel has to be enlarged, once this is accomplished, the sky is the limit.
The T-56 Magnum can be bolted behind just about any power plant you can dream up.  From an SBF to a Big block or Module Coyote, the Magnum Six-speed with handle high loads down the strip or just pro-touring the open road.
Our 1969-70 Mustang 5 & 6 Speed Conversions package is very complete with many choices to custom tailor the six-speed to meet your needs.  With the Six-speed we highly recommend our LF series hydraulic clutch release for a light soft-pedal that provides lots of header clearance.  In just 15-20 Minutes we can build you a detailed custom quote for you to review


Automatic or full conversion packages

Modern Driveline has perfected the automatic to five-speed conversion.  When you contact us we will ask you a shortlist of questions to better understand your needs and wants.
Using our complete line of products, we can offer you everything you need to remove an automatic or completely replace the stock 3 or 4-speed gearbox.
If your project demands everything from scratch, we’ve got you covered.

When removing an automatic, nothing remains.  Our automatic kit provides everything from the block to the second u-joint.  It is important to know which balance crank is installed in your motor.  289/302 up to 1980 from the factory were 28 oz imbalanced.


All 5.0L from 81-95 are 50 oz imbalanced unless the crank has been changed.  Today there are many that are building zero-balanced SBF like Ford Racing.
Let us know what you are planning to run.  We will suggest the right clutch to run based on your horsepower and driving style.
In most cases, we can have a detailed quote prepared for you in under 15-20 minutes.


Converting from Auto to 5-speed or If you just want more driveability from your manual transmission Mustang or want to make it more modern with a 5 or 6-speed we can help with that too.

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

TREMEC 5 or 6-Speed Transmission with Shifter









1969-70 Mustang 5 & 6 Speed Conversions offered by MDL 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, quality & after the order service.

Components are IN STOCK

Click or call for a customized quote for your requirements.

Check out our HOW TO page,
just click this link


We also Have OIL COOLERS
click this link to find out more




Here’s a customer video of his installation on a 1969 Coupe.





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