My Cart


Ultimate Ratio Build Service



This is the best helical / synchronized transmission we offer for high power Road Race applications.  This trans is very strong, but friendly in that you can race at the track and drive it to work the next day.  This trans is assembled with the highest quality materials and workmanship possible to assure a unit which works as intended and will live.  It will shift beautifully, and operate quietly.

All machine work and modifications to the trans are performed in-house using state-of-the-art equipment and techniques.  We do not farm anything out and control every part of the rebuild process here.


  • EVO III 1st - 4th Gears with 'Tighter Gear Ratios'
  • Latest Revision All Bronze Synchros (Forward Gears)
  • Unbreakable 3-4 Shift Fork Upgrade
  • New Intermediate & Input Shafts
  • Large Double Synchro 1st & 2nd Gears
  • EVO III Double Synchro 3rd & 4th Gears
  • 11% Taller 1st gear
  • 4 spring 1-2 Hub
  • Transmission Filter Modification
  • Strong Neodymium Magnet
  • Welded, 4-Spider, or 2-Spider Center Diff Options in the menu above

Attention to detail

We also spend a lot of time on synchro timing, alignment and operation to give you the best shift possible.  Click -> Synchro Blueprinting

Includes free high temp case clear coating to extend the 'like new' look.


WPC is a permanent surface treatment that reduces friction while strengthening the part. Its unique micro-dimple formation pattern greatly reduces friction and is unmatched by conventional methods of surface treatment. It is a proven process that has been utilized for many years in the racing and automotive industry and is complimented by utilizing our REM/ISF treatment. WPC can strengthen parts in two ways. First it adds an extremely high level of compressive stress at, and near, the surface. The second, is that the WPC treatment creates a Nano - Crystalline structure at the surface of the metal. Both of these mean that metal fatigue and crack initiation are both noticeably reduced; thus strengthening the gears and shafts inside of the transmission.


REM / ISF is a gentle polish on the gears done by machine that will smooth and remove some stress concentrations uniformly. It also polishes the gears in the area they make contact with other parts, so you have less friction loss which means less heat, better fuel economy, and longer life.

Heavily worn or damaged units

Please note- any additional parts needed which are not listed below and not part of this build will cost extra to replace.  We will email with pictures and detailed information if this is the case.  We know you do not like surprises, so we try to make this process as painless as possible.  If this turns out to be the case, please note that it is due to the fact that we want you to have the highest quality trans possible.  Again, quality is the key here and sometimes it costs more to do this in an aging platform.  It is not worth the risk of using a sub-par part if inspection reveals it is a weak link.

1990 AWD Trans Owners

Please note: 90 AWD trannies will require a replacement 2G style center diff housing which is $300 more.


1-2 Shift Fork combined with our efficient double synchro makes for a very strong and reliable assembly.  You will never have to worry about a broken 1-2 fork again.

Unbreakable 3-4 Shift Fork Upgrade

All Bronze Synchronizer Blocker Ring Upgrade

Jacks Trans machined EVOIII double synchro taller 1st gear upgrade, with removed lip, to allow for longer synchro life.

Jacks Trans machined double synchro 2nd gear upgrade, with removed lip, to allow for longer synchro life. Please note that this gear is NOT the same as the double synchro 2nd found in the 2G. Our gear is designed with more room for synchro wear and a more precise fit.

EVO III Double Synchro 3rd gear
EVO III Double Synchro 4th gear

1-2 Synchronizer Hub
1-2 Synchronizer Slider

Upgraded Unbreakable EVO III 3-4 Hub
Upgraded 3-4 Sleeve

EVO III Input Shaft with Taller 1st Gear

Intermediate Shaft

Tapered roller bearings on each end of the Intermediate and Input Shafts.  It is becoming more common, now that these units are aging, to see intermediate shaft bearing failures.  We replace them in every rebuild to assure reliability.We also reset bearing preloads to our specs for maximum bearing and gear life. 

1-2 Synchronizer Springs (x4)
3-4 Synchronizer Springs (x2)

1-2 Synchronizer Shoes
3-4 Synchronizer Shoes

5th Gear Synchronizer Blocker Ring with Flipped Slider (Excludes Early 90 Style)

Input, Output, and Axle Seals

1-2, 3-4, and 5-R Roll Pins

 Drain Plug / Fill Plug / Reverse Idler / 5-R Rail Detent Washers

Neodymium Trash Magnet

No Additional Cost: 2-Spider Diff with Torrington Bearing Upgrade or Welded Center Diff. The 2-spider center diff is weaker than the welded diff, but is easier to drive on. Welding the center diff makes it the strongest part in the transmission and raises the HP capability.

Want to upgrade to a 4-spider diff for friendlier street use?  Select from the pop-down options above!   

4-Spider Center Diff Upgrade Includes:

Center Diff Upper Torrington Bearing

Center Diff Side Shims

Spider Gear Kit with Pinion Gears

Machined Cross Shaft
Machined Lower Housing

We will also weld scoops to each side of the center diff housing to help with lubrication.  More info HERE

Clean environment and state-of-the-art cleaning equipment

Parts cleaned using industrial parts washers and bead blaster.  Exceptionally clean units is one of the reasons why our transmissions are the highest quality in the business!  We have state-of-the-art cleaning equipment which other trans builders could only dream of.  More info HERE

With the best cleaning equipment, we also have a very clean facility.  All units are built in a spotless environment and using tools, and benches, which are clean and only used for assembly purposes.  In other words, the same tools used to pull your dirty old trans out of your car are NOT the same tools used to rebuild your pristine unit afterward. Take a look at the typical shop and check their tools.  It is shocking how dirty things are in most shops and that dirt will end up in your unit.  That doesn't happen here. 


Your unit is also shipped in a double walled custom made box for Jacks Transmissions.  Your unit will be sitting snugly, and safely, in preformed foam pads to assure trouble free delivery.

Thanks to the Mitsubishi Community

Jacks Transmissions has grown into a company which now services exotic and terribly complex DCT (dual clutch transmissions) used in the GT-R, SST, Porsche PDK, Audi, WV, and many more high end vehicles including the Lambo robotic E-gear.  Due to this exciting change, we have spent a lot of money for the state-of-the-art equipment needed to service these high dollar and expensive units you find in $100k+ vehicles. We have designed and built many of our own parts for these vehicles.

We love the Mitsubishi trans and have not forgotten that it's these units which got us to where we are today.  We will continue to service them as we want to continue to support the community.  This is a great opportunity for the Mitsubishi enthusiast to have a build using the same high-end equipment to service the Mitsubishi trans as we use for the expensive exotic units.  This means that the cleanliness and attention to detail is unmatched! 

All machine work, cleaning and detail work is performed in-house by very talented technicians and engineers.  The quality you get from Jacks Trans at the price we have listed is an unbelievable bargain.  We do not know of anyone else which cleans the trans via a 110gal ultrasonic and Pulse-Jet unit, or employs such talented and expensive people.

The quality and experience you get from Jacks Trans shows with the overwhelming number of high-end vehicles we now service at the shop.  Be a part of the rare opportunity to have one of the cleanest and most experienced shops in the World service your trans! 

Our pricing structure was created to assure only the highest quality materials and workmanship.  Anyone which beats our price is taking short-cuts which you will pay for in the end.  Look into the details of our rebuilds and you will see the additional attention we provide which is unique and can't be duplicated.  We would be honored to keep the DSM tradition alive and service your trans! 

Thank-you for viewing our site and considering us!

Hello You!

Enter your email address for stock alerts, discounts, promotions and more!