Originally Posted by GEARS

This is what I like to build.

EVO-8/9 RACE prepped transmission.

Stronger, longer 1st gear with a longer 4th gear and a shorter 5th gear. This is the best for road racing or drag.

Originally Posted by dayf

Seems like a very viable mod for a track driver. The pump & cooler I saw were $300.

Originally Posted by dayf

There's a guy on Socalevo.net installing the parts on his rebuilt 6 speed.. as well as Razorlab..mentioned on page 6 in this thread:

https://www.evolutionm.net/forums/sh...1&page=6&pp=15

Tilton pump - TIL-40-524 $180


Fluidyne cooler- FLD-DB-30110 $70-100

Originally Posted by 4TUN8

In fact, Warrtalon's failure occurred while accelerating in 4th - not during a shift.

Originally Posted by TTP Engineering

As did mine.

Originally Posted by dayf

There's a guy on Socalevo.net installing the parts on his rebuilt 6 speed.. as well as Razorlab..mentioned on page 6 in this thread:

https://www.evolutionm.net/forums/sh...1&page=6&pp=15

Tilton pump - TIL-40-524 $180


Fluidyne cooler- FLD-DB-30110 $70-100

Originally Posted by hondafan

i believe razorlab said in another post he's going to try the cooler on his TRE(i think)rebuilt 6-speed, but he probrably hasn't had enough time for definitive results yet.

Originally Posted by Maximum Boost

Here is the best info I can find, I would love to know if the gears are made from the same material though.....


WRXtoEVO, you clearly are looking for answers and just about everyone on this forum can appreciate that. However, you may want to try being a little more diplomatic and lighten your words up by using some humor.

First off, some brief history for those who care to know.

I grew up with a dad who always brought back more junk from the city dump then he took there in the first place. He was always bringing home something that didn't work and would fix it. I was 8 years old when I rebuilt my first lawn mower engine. I vividly remember carrying a Briggs & Stratton engine in for Monday show & tell and having my mom come pick the thing up from the principal’s office. I rebuilt my first transmission when I was 10. My dad brought home a 74 Rupp motorcycle that had a bad shift drum. Anyway I have been rebuilding transmissions for many years, ranging from garden tractors to dirtbikes. In 85 when I got my driver's license I broke teeth off of 2nd gear in my old man's 79 Plymouth Champ and that's when I got hooked on Mitsubishi. How do you break teeth off of 2nd gear? The same way you snap axles and destroy clutches, lots of abusive driving. This kept the garage full and my dad raising hell from the time I was 10 until I left for college. Are you bored yet? Me too.

Now let's talk about the 5 & 6 speed transmissions found in the EVO.

The 5 speed designed & built by Mitsubishi while 6 speed is designed & built by Aisin. You probably already knew that because you own an MR and I'm sure you know the gear ratios so I won't bother you with stuff you already know.

Looking at underside photos of both transmissions one would immediately assume the 6 speed was built like a brick **** house but don’t judge the book by the cover.

Like I said earlier in this thread the shaft center spacing the 5 speed input shaft & output shaft are roughly 10mm further apart than the 6 speed. This may not sound like much but anytime you increase the shaft spacing you greatly reduce the amount of force on the teeth. However the final drive on the 6 speed is a 4.85 whereas the 5 speed is a 4.53 so there is a little more torque multiplication going on there which probably makes up for the shaft center spacing.

Here are the gear width measurements for the 5 speed.

1st = 14mm
2nd = 17mm
3rd = 19mm
4th = 18mm
5th = 18mm

Summary: Be CAREFUL when launching the car. I rarely see any breakage problems with the 5 speed other than 1st gear, it is possible to crack the teeth on the input shaft or lay the teeth over on 1st gear. For some unknown reason people tend to think that manual transmissions are immune to gear breakage from dumping the clutch yet it is common knowledge that you don't rev up an automatic in neutral and put it into Drive. The fact is you will, over time, fatigue a wheelbarrow's worth of drivetrain parts if you launch any car abusively.

Now here are the gear width measurements from the 6 speed.

1st = 19mm
2nd = 19mm
3rd = 16mm
4th = 14mm
5th = 14mm
6th = 14mm

Summary: 1st-3rd are very stout and shouldn't give you much of a problem but I'd be careful in 4th-6th. The tooth profiles on 4th-6th is dainty making for a quiet transmission. For the record the DSM 4th gear is 15mm and it's known to eventually give up the ghost, especially if you are making over 700whp so I'm skeptical about the 6 speed. In this business it's good to be skeptical. It doesn't mean that you don't agree with somone's findings, it only means that you've been doing it long enough to know that most of what you've read on the internet has a signal to noise ratio of an old short wave radio on a hot summer day. In time I will have more data on both of these transmissions and I'll happily share my findings.

As for the final drive gears the 6 speed is incredibly stout yet I rarely see the teeth on the 5 speed have any problems. The fuel economy of the 6 speed can be attributed to the 4% taller 6th gear and the narrow gear teeth yet with the CEL tune of my MR I can barely manage 24mpg on the highway.

The synchronizers on either transmission are pretty good and with a properly adjusted clutch one shouldn't have too much of a problem with them but if you are shifting it fast as you can there will come a day when it may not shift as good as it used to. Contact me if you need help.

As for Teflon cables, thinner transmission oil and the other improvements they will help make for a nicer shifting transmission but this won’t improve the strength of the transmission. If this MR wasn't my first new car I'd have the 6 speed out and the 5 speed with drag gearing and never look back.


Jon@TRE

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Originally Posted by razorlab

I'm earlyapex on socalevo/norcalevo and razorlab on here. One and the same



Got the TRE rebuilt 6spd back this last friday, finally! It's going back in the car today. I will be installing the tranny cooler and tranny temp gauge/probe in the next coming weeks and will be doing a full write-up with photos.