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Old 08-14-2013, 06:41 PM   #501
rymaggi
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Quote:
Originally Posted by BoostHard View Post
Sounds like a case of poor driving. Mine has almost 100k on the clock with a stage 3 clutch and every bolt on including a bigger turbo and I've put well over 100 full out 8-10psi drag launches on it.
Posts like this makes me consider building my motor first and slapping a 20g on it instead of getting a sti transmission first.
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Old 08-14-2013, 06:45 PM   #502
flimflamman
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Quote:
Originally Posted by BoostHard View Post
Sounds like a case of poor driving. Mine has almost 100k on the clock with a stage 3 clutch and every bolt on including a bigger turbo and I've put well over 100 full out 8-10psi drag launches on it.
1st gear is tough. It is second gear and third (for us 06/07 folks) that can snap with to much power and/or abuse/ignorance. In most cases... yes you are probably right.. but they can still only take so much power.

I'm still shifting smooth after 103k *knocking on wood*
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Old 08-14-2013, 07:01 PM   #503
rymaggi
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I'm at 83k stg2.5 vf39 283/323 stock clutch and rip through gears fine.

Only in 4th ill get a slight grind when redlining 3rd. Think it's time for a fluid swap.

I've never launched it or FF shifted.

Currently debating whether to do the V7 swap. Or building the motor with a 20g and e85 and hoping the tranny lasts a year.
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Old 08-14-2013, 09:27 PM   #504
BoostHard
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Quote:
Originally Posted by rymaggi View Post
I'm at 83k stg2.5 vf39 283/323 stock clutch and rip through gears fine.

Only in 4th ill get a slight grind when redlining 3rd. Think it's time for a fluid swap.

I've never launched it or FF shifted.

Currently debating whether to do the V7 swap. Or building the motor with a 20g and e85 and hoping the tranny lasts a year.
I'm on E85 now with more mods. The trans will definitely be tested now. We're going to experiment with limiting tq to help save the trans. But, basically... I use ffs and launch control on 235 wide all seasons. I honestly think the rear subframe diff lockdown helps relieve some shockload, i knocked of 9.5lbs of unsprung weight per wheel too.

Drive it like you want it to last and it'll be fine till you start making power. I shift fast too, and like mentioned by someone else in this thread, I never sidestep the clutch and dump it on a launch. I let it out to the point just before it catches then quickly and softly release. When shifting, make sure the gear is fully engaged before releasing the clutch again... and when you're not racing, drive the car like you're on a mission to save gas lol.
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Old 08-19-2013, 03:42 PM   #505
sexyyrex
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Quote:
Originally Posted by flimflamman View Post
1st gear is tough. It is second gear and third (for us 06/07 folks) that can snap with to much power and/or abuse/ignorance. In most cases... yes you are probably right.. but they can still only take so much power.

I'm still shifting smooth after 103k *knocking on wood*
It's not the gears that are the weak point. The weak point is the stock transmission casing. Under torque load, it flexes, and the gear engagement becomes higher up on the tooth rather then at the base, where the material is the thickest.

The gear engagement changes with case flexing because the drive and driven shaft become farther apart from one another due to the design of the case and where the shafts are affixed on the case.

When gear engagement changes from the base to mid tooth, the amount of gear material in contact is less. Less material with the same amount of stress = failure. This is why the drive gear always shreds the driven gear, because of the amount of stress the drive gear exerts on the driven gear. Mine was going good all the way up until the day I sold it.

3rd gear is in the middle on the shafts, so its no secret that the casing flexes the most at this point, almost always causing a failure in 3rd, either under load or just driving around.

FWIW, the life of your transmission almost always has to do with your driving style and how the casing is shocked. My trans lasted 30+ track passes at 350 ft/lbs with heavy slipping from launch and shifting into each gear. Less shock load = less stress differential and the longer your transmission will last.

Last edited by sexyyrex; 08-20-2013 at 08:53 AM.
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Old 08-19-2013, 04:01 PM   #506
BoostHard
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Quote:
Originally Posted by sexyyrex View Post

It's not the gears that are the weak point. The weak point is the stock transmission casing. Under torque load, it flexes, and the gear engagement becomes higher up on the tooth rather then at the base, where the material is the thickest.

The gear engagement changes with case flexing because the drive and driven shaft become farther apart from one another due to the design of the case and where the shafts are affixed on the case.

When gear engagement changes from the base to mid tooth, the amount of gear material in contact is less. Less material with the same amount of stress = failure. This is why the drive gear always shreds the driven gear, because of the amount of stress the drive gear exerts on the driven gear. Was going good all the way up until the day I sold it.

3rd gear is in the middle on the shafts, so its no secret that the casing flexes the most at this point, almost always causing a failure in 3rd, either under load or just driving around.

FWIW, the life of your transmission almost always has to do with your driving style and how the casing is shocked. My trans lasted 30+ track passes at 350 ft/lbs with heavy slipping from launch and shifting into each gear. Less shock load = less stress differential and the longer your transmission will last.
Hammer, meet nail...

That's why i like my southbend dxd clutch. It slips a little on a dig and takes strain off of the trans
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Old 08-22-2013, 11:20 AM   #507
krylon
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OP, do you know if the main shaft plate was changed when they did the 3rd gear rebuild. Chances are that first owner, or someone else did a clutch job and upon reinstalling tranny, unaligned..forced the tranny to bolt up, bending the main shaft plate. That is why you may have that pushing/pulling feeling, especially getting off/on the throttle.
Even a few degrees of bending will really put things into a stressful situation in the case, especially for third gear. Eventually, this leads to 3rd/4th popping out of gear and failure usually occurs. Not many ppl look at this, or even know of the problem, but I'm usually the guy that gets the fix something, that someone already tried to do and find these issues.
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Old 09-08-2013, 07:36 PM   #508
devlin0311
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108,000 on my trans (redline oil) with original clutch and still going strong. I've been at 330 whp 363hp for over a year. I beat on my car daily and I'm starting to have a change of heart with the whole 5 speed is weak s h I t. I understand its not as strong as the 6spd but I loved hitting 60mph in only 2 gears instead of three. I like that my car is a little lighter and has 5 gears. Now I don't launch and give plenty of time for gears to engage so I have piece of mind. Next upgrade is excedy organic or oem. Not sure which one. to get. I must say I don't think my trans would handle 400tq so I must wait and save for a major drive train upgrade
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Old 09-08-2013, 07:48 PM   #509
BoostHard
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Another update.

Car just crossed 100k running more mods on e85 w/ 22psi. Trans is still holding together.
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Old 09-08-2013, 07:58 PM   #510
devlin0311
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What are your tq and hp ? Whats your driving style
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Old 09-08-2013, 08:50 PM   #511
Big-E
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June 2011:
Quote:
Originally Posted by Big-E View Post
*2006 WRX, 49,000 miles
*EFI Logics ProTuned, 230whp/300wtq (my estimated net at the crank: 300/330)
*Four-season daily-driver, with occasional auto-cross for third year now
*No other motorsport events and definitely no street racing. No clutch dumps. Spirited driving: yes
*OEM engine/drivetrain.
*Many chassis and suspension mods
*Fluid is changed every year and has been changed 5-times so-far
*No clutch or transmission problems
July 2013:
Now with 69,000 miles
Now with EBCS and TiC/MAW TGV deletes (and other existing intake/exhaust mods)
EFI Logics retune @ 95-degrees-F and 65% humidity on a Mustang dyno: 232whp/316wtq

Transmission is still going strong
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Old 09-08-2013, 10:53 PM   #512
BoostHard
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Quote:
Originally Posted by devlin0311 View Post
What are your tq and hp ? Whats your driving style
I have no clue, never put it on a dyno. It's on an evo3 16g 8cm, full bolt ons minus header and up, forge mbc, cxracing tmic, cxracing aluminum radiator, p&p intake mani and tb, kinugawa billet adjustable wga, 1250cc injectors, 300lph pump, southbend dxd stage 3 clutch, etc, theres more but i forget.

I pull my buddie's fp red e85 08 sti by half a car to 95, he has about 2 1/2 on me by 120. He's only on 18psi tho for now.
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Old 09-10-2013, 09:28 AM   #513
2wickedWRX
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I just swapped to the sti 6 speed, but my 2007 wrx 5mt held up fine for the 36k miles that I had it in the car for. 25/36k miles The car was protuned with a vf43, tgv deletes, STI tmic, and tbe....(basically protuned stock STI at that point) dyno'd 276hp 310lb/ft @ the wheels on a very conservative dyno. Trans held up fine only stalled the car 2 maybe 3 times and never grinded. Used stock fluid for ~26k miles then switched to Motul gear oil for 10k miles.
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Old 09-30-2013, 12:45 AM   #514
devlin0311
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Been pushing 330whp for well over a year and a half at 110,000, miles. Going strong on original clutch and tranny. Kind of pissed I believed all these comments saying i broke my tranny mumbo jumbo. I was scared for a long time. Now I just understand that it really is all about the driver.....
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Old 09-30-2013, 12:39 PM   #515
buckwilly
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Quote:
Originally Posted by devlin0311 View Post
Been pushing 330whp for well over a year and a half at 110,000, miles. Going strong on original clutch and tranny. Kind of pissed I believed all these comments saying i broke my tranny mumbo jumbo. I was scared for a long time. Now I just understand that it really is all about the driver.....

Then push it hard man. Throw some wide 18" wheels and tires under it while you are at it. Its not the horsepower that blows it up, its the torque and the shock created by the gearing. Its inherently weak.

You are talking to many of us who drove their car normal and never dropped a clutch or ground a gear. My mistake was putting 245 width tires on 18" wheels and driving the WRX spirited through the mountains for hours on end. Try driving your car through some extremely twisty roads with significant elevation changes that involve a lot of downshifting. Or just take it to the track....something tells me you will be part of the blown tranny crew. There is a good chance many people will never blow up their 06/07 tranny, especially those that don't push their vehicles via modifications or just driving.

I've had my case cracked open, I've read dozens of threads and articles on the stock gear set. The transmission is flawed straight from the factory. There is a reason why the 2008 and up have a legacy gear set in them. But hats off to you for making it this far. Hopefully you never know what if feels like to have a tranny fail in the middle of no where while your on vacation like me. LOL.

For those who were watching my updates on the STI RA close ratio gear set from Rallispec I installed when I blew my tranny up - I sold my WRX last July and bought a newer STI hatch. The guy I sold it to still stays in contact from time to time and its still running strong for those following this thread. I highly recommend that gear set as long as you don't mind losing about 4 mpg highway due to the close ratio geared 5 speed.
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Old 09-30-2013, 01:01 PM   #516
BoostHard
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I'm currently sitting right around 350-360whp and most likely upwards of 400tq.

Still no issues, the problem lies in poor driving habits and case flex. It isn't the gearset, plenty of people have stripped the teeth off of 2nd or 3rd gear running the ra or lgt gearset. Hell... i watched a stage 2 2012 wrx strip the teeth off of 2nd just a couple of months ago.
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Old 09-30-2013, 02:58 PM   #517
linkubus06
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Never been on a dyno but my stock tranny is still going strong with 75k miles and original clutch. Here are my mods:
-TD06 20G at 19psi on 93oct
-1000cc ID's
-Walbro 255
-TurboXS TMIC

I have been at this level of power for probably 5k miles (and stage 2 for 4k miles before that) and never had any grinds or any problems yet but I also do baby the gears most of the time. I have never launched from a stop and never FFS but I routinely do WOT 2nd-4th gear runs (maybe once every other day to get my fix haha).
That said I am in the process of doing a 6speed swap so I can go E85 and not baby it so much. I have been pretty paranoid so if I am not trying to go fast I drive like a granny.
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Old 08-31-2014, 05:13 PM   #518
devlin0311
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At 134k miles with the original clutch and transmission. Only issues I've had are synchro grind which was cured with redline. Sometimes second can feel notchy, but it's on occasion. I believe that my 5 speed will last another 50k until my Synchro's wear out. I'm about 100 torque over stock and drive like an ass often. Every year, I have a beer to celebrate.
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Old 09-01-2014, 02:14 PM   #519
coalslaw
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125k miles on stock clutch and transmission here.

Stage 2 Cobb map along with TiC holy shift kit and Group N mount since 118k miles. still shifts very flawlessly and pulls good. I do bi-annual gear oil changes with Motul 75w90 and occasional boost sprints. I feel sorry for everyone on here who blew their transmissions. it's clearly from the neglect of care and supplement of abuse.
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