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Old 09-21-2009, 02:12 AM   #1
970subaru
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Default 3.9:1 vs. 4.11:1 cable clutch trans into legacy turbo wagon

got a line on a 3.9 cable trans. not sure what it is out of originally because it was swapped into a 93 ej22e legacy. now i am putting it into an ej22t car. I have seen that people are putting 300bhp through the impreza NA trans with ok results. but what about this trans into a 3300lb station wagon? the motor is stock at the moment but i will probably take the car to ~220whp shortly. i won't be banging gears or sidestepping the clutch or anything, but I do like to shift hard sometimes.

is there an appreciable difference in strength between a cable clutch trans with a 3.9 diff and one with a 4.11 diff? if the gears are the same, wouldnt the 4.11 trans be stronger due to less mechanical advantage on the gears? I know that douglas vincent straight up abused his 4.11 transmissions and only broke one on a WOT missed shift. i wouldnt mind going to a 4.11 trans which i trust for my power but would rather use a 3.9 trans so that i dont have to regear my vlsd diff.

will the exedy stage 1 kit hold the power levels i am looking at, and if not what direction should I go? Spec clutch has some upgraded ones but I like the price of the exedy a lot better and ran one in my 2.5/2.2 frankenmotor for a few years no problem at about 180 bhp.
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Old 09-21-2009, 08:23 AM   #2
Storm
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The only difference (besides the obvious final drive ratio) is in the method the clutch is operated. There are no other differences.

I personally think you'll be okay, provided the trans is in good shape. You don't know the history, so it may be wise to open it up for inspection and freshening prior to installation.

Jay
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Old 09-21-2009, 10:58 AM   #3
Matt Monson
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You'll be fine. There's no difference on the internals between the two gearboxes. The clutch you want to use will hold the power you plan to put down.
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Old 09-21-2009, 02:40 PM   #4
970subaru
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thanks guys.
whats up matt! how ya been?
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Old 09-25-2009, 12:56 PM   #5
Legacy777
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You will need to swap the pedal boxes for the cable actuated clutch pedal.
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