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02-06-2008, 07:40 PM | #1 |
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2008 STI Tranny Specs
There has been some discussion over the PPB about the 08 transmission in
the 08 STI. Here is a look at the tranny parts from each model year. First and Second Driven are new parts, as is 6th Drive. However the other side of 1st, 2nd, and 6th are UNCHANGED. So the ratio's must be the same as 07. And here is a look at the tranny numbers for all of the US Spec WRXs and STIs. Cheers, Jeff
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02-06-2008, 09:33 PM | #2 |
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This is great info!
Would you be able to create a similar list cross-referencing tranny part numbers for WRXs? I'm looking to do a rebuild with new synchros and curious to see what has changed over the years. Thanks! |
02-07-2008, 12:35 AM | #3 |
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02-13-2008, 03:51 PM | #4 |
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Bumping to prevent this thread from slipping through the cracks.
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02-16-2008, 08:13 PM | #5 |
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Thank You!
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02-19-2008, 06:56 PM | #6 |
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great info...
i had heard that although the gearing is the same, the gears, synchros, and oiling system had been revamped for the better. does anyone have any information on this or experience comparing the 08 to earlier models? thanks... edit: comparing info from www.cars101.com which says the 2008 STi gearing is: 2008 STi 6 speed manual 1st 3.636 2nd 2.235 3rd 1.521 4th, 1.137 5th 0.097 6th 0.756 Front final gear ratio: 3.9 Rear final gear ratio: 3.545 and according to the Transmission Gear Ratio thread here on NASIOC which states: 2004-2006 manual transmission gear ratios: 1st - 3.636 2nd - 2.375 3rd - 1.761 4th - 1.346 5th - 0.971 6th - 0.756 reverse - 3.545 final drive ratio - 3.90 2007+ manual transmission gear ratios: 1st: 3.636 2nd: 2.375 3rd: 1.521 4th:1.137 5th:0.971 6th: 0.756 reverse - 3.545 final drive ratio - 3.90 there is some confusion there. i'm thinking that the 2nd gear ratio for the 2007 STi is listed wrong here on NASIOC and thats where the confusion is? Last edited by TROLL; 02-19-2008 at 07:02 PM. |
02-19-2008, 09:10 PM | #7 |
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The 2008 STi trans does not have a oil pump assembly. It now uses oil guides.
Another few notes: They is no longer a dipstick on the 08 trans and the 08 no longer uses the speedometer sensor. I still need to check if I can install a 07-earlier Speedometer driven gear shaft so that the 08 trans can be swapped into an older car and still have the speedo work. 07 and 08 gearing: 1)3.636 2)2.235 3)1.521 4)1.137 5)0.971 6)0.756 Last edited by Nitro Don; 02-19-2008 at 09:17 PM. |
05-18-2008, 05:13 PM | #8 |
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http://forums.nasioc.com/forums/show....php?t=1518667
Here something I'm looking into doing as far as upgrading the stock gears goes Last edited by spoolinsti05; 05-18-2008 at 05:26 PM. |
05-26-2008, 02:04 PM | #9 | |
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Quote:
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11-09-2008, 06:28 PM | #10 |
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does anyone know what mods would need to be done to swap a 5sp for a sti's 6 sp tranny for a 08wrx?
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11-18-2008, 04:45 PM | #11 |
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2008 STi 6 speed manual
1st 3.636 2nd 2.235 3rd 1.521 4th, 1.137 5th 0.097 6th 0.756 Front final gear ratio: 3.9 Rear final gear ratio: 3.545 are you sure about the rear final drive ratio ? if yes we can use 2008 r180 directly with wrx 5mt. |
11-23-2008, 11:25 AM | #12 | |
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Quote:
So what's better oil pump or oil guides? Eliminating oil pump sounds like a downgrade. I found some old material when 6 speed was introduced and the oil pump was mentioned as a big deal to improve oiling over 5 speed trannies. |
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11-23-2008, 12:05 PM | #13 |
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In my opinion, an oil pump in the tranny is over engineering. As the gears spin oil is already lubricating the gears. The 08 STi does not have an oil pump and neither does it have a dipstick. You check oil level by literally opening a bolt on the passanger side of the tranny and filling it up to the specified level.
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11-23-2008, 12:14 PM | #14 | |
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Quote:
Here is what I found about the oil pump: "It has an internal oil pump for pressure lubrication. The change to pressure lubrication assures that local temperatures in the gear box are kept under control, a valid criticism of the 5-speed design under racing conditions. The 3.9 final drive unit has a separate oil galley, isolating possible gear chips and further managing internal thermal loads." http://www.spdusa.com/6-speed_conversion.htm Btw, the dipstick is very convenient. Not only for checking the oil level but also for filling the tranny. Getting under the car to check level is not quite convenient.... |
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11-29-2008, 09:27 PM | #15 |
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in edm cars user manual, the gear ratio seen as
3.636 2.235 1.590 1.137 0.891 0.707 3.90 3.54 maybe there is a diffrence between edm and usdm as usual. |
11-30-2008, 12:10 AM | #16 |
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EDM STI ratios are like USDM LGT SpecB ratios.
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11-30-2008, 01:21 PM | #17 |
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11-30-2008, 01:25 PM | #18 | |
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Quote:
Rallispec told me that they can convert 07+ STI tranny to SpecB ratios by using 5-6th gears from JDM STI Forester tranny. |
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11-30-2008, 01:32 PM | #19 | |
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Quote:
Frank |
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02-05-2009, 02:39 PM | #20 |
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Thanks to a poster over on IWSTI, the following site gave me the part numbers for the EDM taller 5th and 6th gears:
http://opposedforces.com/parts/ 6th drive: 32363AA100 5th drive: 32341AA350 5/6th driven: 32364AA070 at least I believe these are them- I chose "europe, left hand drive" in the menu structure. There was an alternate listed for the 6th drive gear as well, but no alternates for 5th and the driven gearset. Here's the 6th alternate: 32337AA030. Note that it did not call it a supercede. Frank |
03-17-2010, 03:39 PM | #21 |
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There's two versions for the 07 STI trans. Which part # is the one with the pump (the other I presume is splash lubricated)?
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04-29-2010, 01:14 PM | #22 |
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Since the 08 does not have a dip stick anymore there is a female 6 point (allen) bolt on the top. I'm assuming this is the fill location?
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04-29-2010, 01:41 PM | #23 |
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09-26-2011, 03:01 PM | #24 |
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Do 08 STi axles fit/work in other transmissions? If so, which years?
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09-26-2011, 03:18 PM | #25 |
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Nope. 08+ STi axle bars are longer than 07 and earlier STi bars. The outer CV ends, splined end, is also longer than previous years, so they wont work with older hubs/unit-bearings. Havent looked at the inner CV stub, but Im sure its the same as 07 and earlier.
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