\

Alot of those points go for the 2005 5 speed tranny as well, like the Teflon coated shifter cables and short throw. I drove 2 03 EVOs and they did not feel anywhere near as smooth as my tranny. Also, remember 5 speed 2005s have the better TC's too.... probably why I havent had any problems yet!

On another note, I always told myself in the event that my tranny did take a poop, that I would maybe go for an MR 6speed one. However, would my swap be more direct since I have an 2005 EVO8?

 

Listen stupid mo fo, shut the $uck up. I haven't insulted no one until you insulted me.
Back to the subject, NO ONE has been able to bring some prrof that the 5 speed is stronger that the 6 speed

 

Who is the dude that you are talking about?

 

Not at all. I am not any guru. However I can put a case well together. Yeah, you are correct, I haven't even seen a EVO tranny opened, I don't know of many tranny rebuilders, but for the last 48 hours I am defending the unfounded comments that someone made saying the 6 speed tranny is weaker than the 5 speed.

If you pay attention to the original topic you will find out that because of the vast majority of EVO owners drive the 5 speed they feel that the 5 speed is good enough for them (I agree) the problem is when someone brought the topic saying that the 6 speed is weaker(basicly talking smack without proof)

 

I'm just saying, why argue against gears. I'm very certain he knows his transmission and what he says is true. After all, he does sell the swap. But saying he doesn't know his transmission is like telling garrett they don't know their turbos.

 

You can bet your life on anything the Jon (TRE) or John (Sheppard) says about evo transmissions. They probably know more about the trans than the engineers that designed them

 

alright pal, you really need to grow up and get over this.. you've wasted this thread with your ranting & raving.

mods.. please lock this thread soon as you can all see it's going nowhere.

 

"GEARS" works on DSM and EVO transmissions for A LIVING! He makes his own damn gears and modified parts for the trannies, why are you questioning him so much? I think he knows a tad more than you! Comeon man!

 

If you are doing tight course work such as rally or just want to shift gears like crazy just to get anywhere, sure the 4.89 gears would do the trick.

I personally think the EVO is geared too short in the first place, especially when making more power than stock.

Jon@TRE

 

Yes. Yes. No.

IMHO, I'd take the $2000+ and spend it improving my torque curve before adding gears. Frankly I'd rather have a broad flat torque curve and 4 speeds than more gears to row through with 6 speeds.

 

I totally agree with you. I drove my MR down to Indiana for some fireworks this weekend, taking the back roads for the whole trip, and all I can say is that I felt like I was rowing a boat with every shift. True if I were to scream the engine out to the redline in every shift the gear spacing would've made sense but short shifting the transmission at 4000rpm was a PITA. I felt the only thing worse could be a dump truck with a 2 speed rear-end.


Jon@TRE

 

OK.......................

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

 

just want to clarify something, the five speed is not better than 6 speed and is not STRONGER. In japan, all the evo 8 comes with 6 speed, RS GSR MR only the cheapest RS comes w/ 5 speed. and on the track all the major tuning shop based on the evo Viii use have the 6 speed tranny. it is just a better one, becase on the 5 speed the 4th and 5th gear is too far apart compare to the 6 speed therefore you dont have that strong pull when you put in 5th gear in the 5 speed tranny.

 

That was some useful info! I have a question for you GEARS: Have you ever weighed the 5-speed and the 6-speed? I am curious to know if there is a significant weight difference.

 

In regards to which is stronger, only time will only tell if this is the case. Being that I have a MR, I can only hope that the 6 speed is as capable as the 5 speed.

I agree with the gear spacing between 4th & 5th on the 5 speed, yet there are few tracks in the US that have a long enough straight to use all of 4th and those who want a shorter 5th gear....we have them.

Jon@TRE