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Old 02-14-2008, 10:34 PM   #1
sonic03rex
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Default 2004 STI 6mt vs 2005 STI 6mt

Just a quick question.. are these two gearboxes the same? I may choose to buy a whole new(used) 6mt if it turns out my 2004 6mt is going to cost too much to repair.

There are quite a few more 2005's listed on car-part, can I use either year without changing anything?

It wasn't until 2006 that the ratios and rear diff changed right?
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Old 02-14-2008, 11:02 PM   #2
neko
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correct. same gear rations. different type of front LSD (i think the general consensus is its a better one) but same gear ratios and compatible with the same rear end.
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Old 02-15-2008, 12:42 AM   #3
Scooter Sube
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well, '05 + have different hubs, so you'll need that ...different hubs w/ different bolt patterns, so you'll need some new wheels...since hubs are bigger you'll need new suspension (correct if wrong)...thats it
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Old 02-15-2008, 01:40 AM   #4
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do you knwo if your 04 tranny has stubs in the tranny? the thing that i have been finding out because of research of 6mt swaps is that the axles on 04 sti and 05 sti are different. one are male axles on the inside and the other are female ended on the inside, such as 04 sti's that have stubs already on the tranny in which the axle slides into the tranny, female axle to male stub. the 05 sti does not have stubs in the tranny and use male axles that insert into the tranny completely. this would require you to get 05+ sti axles in the front, which in turn you would have to do the above post^^^^ because the 05 sti axle will not work with the 04 sti hub(outside). hope this makes sense, please ask questions if you do.
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Old 02-15-2008, 07:44 AM   #5
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the only real difference b/w the two is that the 05 has bigger wheel bearings and more selection of rims. If thats what you want, 6gun racing sells a 04 to 05 hub swap....there is a thread here recently about that...ch-ch-check it
i have a complete 05 drivetrain soon to be for sale?
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Old 02-15-2008, 01:03 PM   #6
sonic03rex
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Default

Hey guys sorry for the delay I've been super busy, and thank you for all the responses. I'm going to have to look into this a little further it seems.

Thank you again for the input! I totally forgot about the hub difference. Scooter, when are you planning on putting your drivetrain up for sale?
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Old 02-15-2008, 02:14 PM   #7
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The early 04 trannys still had stubs on the front transfer case. The front axles had 'female' parts on the inside. Later (and most) of the 04 trannies had axles that plugged into the front transfer case. If you search the boards you will find picks that will show the difference between male and female axles. You can then crawl under your car and figure out what you have. If you have a later MY04 the swap should physically work with your existing axles. All other physical issues are the same (mount points, gear ratios, etc).

I have no idea how the DCCD will swap over or if it is a concern.

The 05 DCCD controller had more inputs, so I would guest a different input harness. I would also bet that the outputs were the same (the wires that actually control the diff) because the center diff is the same. I am not well versed in how the DCCD plugs into things and where various sensors are located so you should find some one who is and ask them if the swap will be direct in an electrical/plug sense.

If for some reason you do need to change axles to 05 (i doubt) you will need to address the change in the outer ABS gear location (located at the outside end of the axle). An 04 knuckle will not place the ABS sensor over the gear on the outside of the 05 axle. Further more 04 hubs will not bolt to 05 knuckles. There are many options you can take here ranging from free to $texas$.

Hope this helps.
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Old 02-17-2008, 02:37 PM   #8
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yup ^ listen to this man. he knows a thing or two. (besides offering the above-mentioned 04-05 knuckle/hub conversions was well).
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Old 02-17-2008, 11:49 PM   #9
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here's a pic of an early 04 STi stub (which would attach to a female 04 STi axle) and below it is an 05+ Male STi axle.


you can definitely use the 05 STi trans, and you can use your current hubs and whichever axles you have. if you have male axles already, then just pop them into your new 05 6MT and thats it. if you have female axles with stubs, you'll need to get new axle seals and install them before inserting the axles/stubs into the tranny.

the other question is the dccd... i'm pretty sure you'll be fine. i know for sure that it will physically plug in without issue, the question is if the wiring or logic is different. the wiring leading to the transmission is a simple 2 wire solenoid that works off of PWM, so thats a pretty universal setup. the only difference could be in the actual dccd box and how it interprets information from various sensors to control the diff.
you would be keeping your original dccd controller, wiring, and sensors, the only thing that would change is the transmission to receive this PWM signal, and i'm fairly confident it will work properly. if it doesnt, you'll know and you can just unplug it until you can find a proper solution, but i honestly dont think you'll have an issue.
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