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Old 09-02-2013, 09:08 PM   #1
Dave W
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Default Dimention diffeerances between the 5 & 6 speed transaxle

I am new to this forum so if this question has been asked and answered before I apologize. I am building a kit car that uses the Subaru engine, 2005 or 2007, and transaxle in a mid engine track car. The car is set up for a 5 speed but I would like to use a STI 6 speed. So I have a couple of questions.
1) What is the overall difference in length between the two transaxle?
2) Is the shift rod in the same location, i.e. distance from the front face of the transaxle to the back end of the shaft?
3) Can the 6 speeds be converted to front wheel drive only the same as the 5 speeds?
4) Are the inner axle joints the same or is the spline count or diameter different?
5) And finally, from what I have read the 6 speed is a more durable that the 5 speed.

Thank in advance for any input.
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Old 09-02-2013, 10:29 PM   #2
scby rex
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aw, MPS 2.34 breaking in

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trans wise the splines are the same count and diameter. The 6mt axles are stronger than the 5mt also and uses a larger stronger cv.
Im assuming your building a FF818?
Thats all I can help you with as I have no idea how much more complicated it is to convert a 6mt to fwd only, btw the 5mt is way lighter.
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Old 09-03-2013, 07:00 PM   #3
Dave W
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Yes, the question relates to the 818. F5 is unclear as to why the 6 speed can't be used. The conversion to FWD only basically requires removing the center diff and connecting the two shafts that go to the center diff together with a splined coupling that they provide. I would rather use a STI drivetrain since it appears to be a little beefier and of course more power is always nice. The shift rod may be farther back on the 6 speed than on the 5 speed. Hopefully someone will have dimensions for both transaxles.
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Old 09-05-2013, 08:28 AM   #4
scby rex
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aw, MPS 2.34 breaking in

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If it was me I'd do a helical cut ppg box with a diff and call it a day. Its a toy anyways right?
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Old 09-05-2013, 11:50 AM   #5
FlatironsTuning.com
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Quote:
Originally Posted by Dave W View Post
Yes, the question relates to the 818. F5 is unclear as to why the 6 speed can't be used.
At a guess, I'd say that it has a lot to do with the different shift pattern between the 5MT and the 6MT. The 6MT has a locked reverse, and you have to push the shift lever beyond where any of the 5MT gates would be. Since you are using a remote linkage in the F5 818, that would most likely be the biggest issue.

The 6MT is also approximately 100 lbs heavier than the 5MT and in a car that light, that will make a difference as well.

I believe that locking out the center diff in the STI transmission may be more complicated as well.
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