quick question people how come if you are running around 350bhp in a classic wrx the gearbox will blow very oftern with hard driving even tho the gearbox in a classic wrx is the same as a classic sti gearbox.but you buy a new age subaru sti 5 speed i know people running 400bhp all day long with out any problems at all, are they stronger box im a little puzzked buy this one people so any help would be much appriciated

 

The gearbox casings may be the same/similar but the internals are hardened on the STI and newage wrx's, they are not on the classic wrx's

Tony

 

if this is the case can i not put a later sti box and diff for my classic then this should be able to take the 350hp that my car is running. what year sti box would i need?

 

anybody

 

i think the newage has the 6 speed gearbox which is stronger

 

mine is a newage 2003 uk sti has 6

 

yes i no most of the hawk eyes are six speed but i was thinking more like wayner845 shape. like he said his is 5 speed so surely that should be a fair bit stronger than the sti classics.i belive the code in wayner845 car would begin with ty754 instead of ty752 as found in the classics.

 

The new age WRX boxes are probably on par with the classic STI boxes, they are OK but not magnificent, if you want strength then its the 6 speeder you want, they are more reliable than the PPG boxes also

Tony

 

i understand that the 6speed boxs are far better than the 5 speed but really cant pay out that much on a 6 speed box, hence why i wanted to know if the new age sti 5 speed would be stronger boxs. but like i said i still cant see how somebody can run 400bhp on a new age sti with no problems and im running 350 on a classic and killing boxs

 

I find that hard to believe?

I cant see the hardening/treatment process being any different between sti & wrx

 

Its easy the classic sti and new age wrx have hardened gear cogs, the classic wrx/uk cars don't have hardened gear gogs, so that's the difference

Tony

 

i dont think that the cogs have gone on the box on there at the min,
and no banging or clanckin like the lasts boxs,
so think its just the gear sync so i belive that the sti boxs must be a little stonger how about the legasy boxs are they stong as when i first bought the car it had a legasy box fitted

 

All gears are hardened, ive never heard of some being more hardend than others?

 

You understand that its the process that hardens them? some are hardened to different levels, the STI and new age ones are hardened to a different level, the normal ones are not hardened to that level and that's the reason they break before the STI ones
So we say that the STI ones are hardened over the wrx ones (which they are )

Tony

 

There are no new age 5 speed sti boxes> there all 6 speed from year 02 onwards in the uk

 

dooby-do,

classic sti boxes aren't any harder than classic wrx ones. the only strength difference is between the ty752 and ty754 and thats it to do with the casings.

I've broken two ty754 boxes, with only 310/310.

the only real option are ppg or modena gearset in a ty754, or 6 speed conversion. The alternative is to drive easy, or stock up on a suply of replacement 5 speeds.

i went 6 speed and its great, should have done it after I broke the first box.

edit: just to be clear, ty752 is early classic, ty754 is later classic, thereafter is 6 speed. did you say you knew of a newage with a 5 speed as standard?

 

The gearsets are stronger on the classic STI, end of, they are not the same as the classic wrx gear sets.
http://www.iwsti.com/forums/drivetra...ts-1499-a.html
Do you need to hold more power put cannot afford the STI 6-speed transmission? Don't want the inconveniences of a dog-box or the price? Looking for a more track friendly gear ratio? Then our STI RA gear-set is the perfect solution for you!
The STI RA V6 gears are a found in the rally-bred Version 6 Impreza STI RA and is designed to be a much beefier swap for your WRX 5-speed transmission. The cryo-treated and thicker gear teeth make for stronger gears and shaft. These makes for a perfect solution for customers looking for gear-sets that will hold more power. For further strengthening, the mainshaft, 1st gear, and 2nd gear are WPC treated.
We recommend these gear-sets for customers looking for gear-sets to hold 275-350 awhp. For higher power levels we would recommend either a STI 6-speed tranny or a synchro-less dog-box.
All gearset kits include STI RA Gears 1-5, main shaft, properly matched speed-o gear, and shifter fork. Please see our bearing and synchro sections for a complete rebuild kit. Rebuild time is generally 5-6 hours of bench time (not including removal & installation) and if your transmission is damaged will usually require new bearings and synchros.
Gear Ratios:
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here's quite a good link for codes;

gearbox codes.

 

here's quite a good link for codes;

gearbox codes.

 

my mate just put a new age wrx box and diff and drive shafts on hes 99 uk 2000 it waz a straight fit and they are 5 speed. when he waz looking at what box to fit he waz told that the new age sti box waz about 7stone heavier he waz told new age wrx boxes are good for 350-400

 

i will look into it i was offered a uk300 5 speed box but it was not a sti box so will prob take a miss on it,the best box that i have had in it that has lasted was a subaru legesy twin turbo box im not sure if these are built to be any stronger but they also start with ty752.the sti box i have fitted at the min was a good box but it was the syncs that have gone this time not the gears,so a new age box would i need to change the diff and drive shafts or could i just change the box

 

I no the classic front drive shafts on a uk 2000 turbo won't fit a new age wrx box we had to use the new age wrx ones and they fit the hubs fine. I can't remember if we had to fit the diff prop and shafts or he just wanted newer ones if you need to know I will ask him but I know they are a straight fit I'm sure a new age wrx box is good for 350-400 bhp I will get the box number off him. I thought all new age Sti boxes were 6 speed and alot heavier

 

Its +30kg for a 6 speed box, there is one (a newage JDM one) up for sale in the for sale section for around 1500 quid (no rear diff/driveshafts though ) but they are pretty damn good

Tony

 

cheers for the guys still have people telling me there is no diffrence between the sti box and wrx box as they are the same..so really needd to make 100% sure that sti boxs are a little stronger inside ill prob go with another sti box get christmas out of the way and then start looking at going to 6 speed