TRE builds the best transmissions for your high power Mitsubishi EVO. Our transmissions are proven, durable, and shift well in the fastest EVOs being Drag Raced, Road Raced, or in Time Attack. We are your last stop before a dogbox AND your first stop for a dogbox.
Every Transmission we build receives the following services as standard:
Drivetrain items are carefully disassembled and inspection reports are filed. When it comes to upgrades and services we will assist by explaining all the options and the pro’s & con’s, so you yourself can easily make the wise choice when it comes to what you really need and not just what we can sell you.
Final inspection & assembly
With a thorough understanding of what needs to be done to improve durability backed by army of machines and specialized tooling are experts in the arena of inspecting gear contact patterns and making corrections to both the transmission case and gearsets to insure a proper and full uniform tooth contact for maximum durability.
TRE builds the best transmissions for your high power Mitsubishi EVO. Our transmissions are proven, durable, and shift well in the fastest EVOs being Drag Raced, Road Raced, or in Time Attack. We are your last stop before a dogbox.
To be more transparent about what goes into a build, we no longer advertise “Stages” of our builds.
All transmissions receive the following new parts:
New 1-5th & Reverse synchros
TRE has been modifying synchronizers for over 25 years. This is our expertise yet we don’t care to brag about the old news of widening the stops to increase the blocking action of a synchronizer. The bottom line is that if you’re needing it to shift fast and last send your transmission to TRE.
New 1st/2nd sleeve
Updated part with improved synchro spring detents and clearanced for better synchronization. Sleeve is trimmed to eliminate damage to 2nd gear during fast shifting.
New 3rd/4th sleeve
Updated part with improved synchro spring detents, biased teeth for better synchronization, and modified to eliminate 3rd/4th shift fork wear. A road racer’s delight.
New 5th/Reverse sleeve
TSB revised part with improved synchro spring detents and biased teeth for improved 5th gear shift quality.
New 3rd/4th shift fork
The 3rd/4th shift fork is prone to wearing out if the vehicle is making serious power or has been running the wrong oil. A worn shift fork will cause sloppy shifting into 3rd & 4th gears and leads to incomplete shifts that tend to grind during engagement.
New Input shaft bearings
Make no mistake, these are the proper bearings to deal with the high radial thrust load that 1st gear develops in the EVO-4/9 transmissions. Understand that by using tapered roller bearings in place of the intended ball bearings will create additional transmission case will flex, leading to 1st gear wearing out prematurely.
New output shaft bearings
Bearings are designed to have a certain amount of preload or clearance on them for long service life. TRE uses Genuine Mitsubishi bearings, making sure they are set right on the money, through proper techniques that provide the longest bearing life while holding the gearsets tight.
New bearing sleeves
Damaged & worn bearing sleeves are replaced with new ones making for a quiet running transmission.
New needle bearings
Damaged & worn needle bearings are replaced with new ones making for a quiet running transmission.
New synchro springs
Synchro springs are always replaced because they lose tension as the shift sleeve’s detent teeth rub against the spring. Synchro springs are considered a NR part, (not reusable).
New snap rings
There are certain items that other shops will reuse in a pinch or when trying to do a cheaper rebuild. This isn’t wise or something we practice. Snap rings are considered a NR part, (not reusable).
New double roll pins
High tension double roll pins are employed to hold the shift fork secure eliminating the need for wire ties. Roll pins are considered a NR part, (not resusable).
New oil seals
Designed with a large dust shielding lip to keep debris from damaging the primary seal, the OEM Mitsubishi seals are the best available for your transmission. Oil seals are considered a NR part, (not reusable).
New 5th gear thrust plates
The thrust plates hold 5th gear onto the input shaft. They are meant to fit tightly so that 5th gear can’t moved and wear out the splines between the input shaft and 5th gear.
New thrust plate stopper.
AKA the “Thrust Plate Retainer”, this part is responsible for holding the thrust plates in place for 5th gear and is considered a NR part, (not reusable).
New bearing shims
Bearing shims are serve the important job of holding bearings at their prescribed preload/clearance.
New Magnetic drain plug
New drain plug and crush washer come standard in our rebuilds. We don’t like rounded off heads on these anymore than you.
Transmission case oiling upgrade
We enlarge the oil passageways to provide additional oil flow to keep parts from overheating when the EVO is used for endurance racing.
New Neodymium magnet
We add a strong Neodymium magnet inside oil reservoir to keep metal from getting into the output shaft and wearing out a lot of parts. The transmission case is CNC machined so that the cover can be removed and the magnet serviced.
Glass beading of transmission case
TRE glass beads the aluminum transmission case at a low pressure at high volume, making for a nice looking transmission because the glass beads don’t impinge the case. While we dislike paints and coatings, we can send your transmission case out for powder coating for a fee. Many colors are available.