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Old 01-16-2005, 09:25 PM   #1
Layman
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Default FXT trans into a GC RS?

Is the FXT 5-speed transmission a drop-in for a GC 2.5 RS?

If I do an engine swap, I'm interested in using the reinforced tranny from an FXT. Does it have the correct ratios and dimensions to use only the tranny and not have to swap the rest of the drivetrain?

Thanks.
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Old 01-16-2005, 11:28 PM   #2
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It'll fit. You'll have to more than likely use the diff off the FXT though unless the final drive on the FXT is the same as the RS. If it's a pull type clutch you'll have to put in the correct clutch as well as change the clutch slave cylinder. While you're in there I would also consider putting in a nice lightened flywheel. It makes it that much better.

Z
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Old 01-17-2005, 12:21 AM   #3
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Cool. I forgot all about the clutch.

I think the final drive is the same. 4.44 on both, right?
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Old 01-17-2005, 12:23 AM   #4
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The RS with a 5MT's final is 4.11, not sure about the FXT.

Z
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Old 01-17-2005, 04:01 AM   #5
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FXT is 4.44.

Ben
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Old 01-17-2005, 05:11 AM   #6
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Quote:
Originally Posted by PHATsuby
FXT is 4.44.

Ben
is it really a 4.444? or are we talking about the auto?
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Old 01-17-2005, 05:37 AM   #7
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it is really 4.44, we are talking about the manual.

Ben
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Old 01-17-2005, 06:23 AM   #8
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so, could it be an STi 5 speed in cognito, i havent heard of a 5 speed with a 4.444 final drive other than STi trannys.

on the original Q, the only problem would be the final drive ratio, as said above.
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Old 01-17-2005, 12:06 PM   #9
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Isn't the RS 4EAT ratio 4.444? If so, you'd be G2G using an FXT 5spd w/RS auto trannied diff.

Jay Storm
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Old 01-17-2005, 12:32 PM   #10
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yes its very likely that it is a v-limited RA tranny in cognito

it is probblay the 3nd most desireable transmission
2nd being a RA w/dccd
1st being a 6 speed
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Old 01-17-2005, 01:00 PM   #11
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Hmmm. So since I have a 4.11 right now, I'd have to swap the rear diff anyhow - unless I wanted to crack open the tranny.

Damn. It's a sweet transmission, but that's a gas-burning ratio!
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Old 01-17-2005, 01:05 PM   #12
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Gas burning? yes, however the forrester still gets half-decent MPG.
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Old 01-17-2005, 02:11 PM   #13
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what is a v-limited RA tranny and how does it differ from the usual STi RA trannies. The forester gets decent gas mileage cause its gear ratios are pretty good, or at least the gas saving one is

Ben
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Old 01-17-2005, 06:31 PM   #14
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FXT still uses tall tires for an overall ratio similar to or lower than an Impreza. At least on the surface it would appear that way.


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Old 01-17-2005, 07:28 PM   #15
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Quote:
Originally Posted by PHATsuby
what is a v-limited RA tranny and how does it differ from the usual STi RA trannies. The forester gets decent gas mileage cause its gear ratios are pretty good, or at least the gas saving one is

Ben
a v-limited RA is a limited edition WRX. it is not an STi version.
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Old 01-17-2005, 07:49 PM   #16
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Quote:
Originally Posted by Hurley 2.5 WRS
a v-limited RA is a limited edition WRX. it is not an STi version.
yes, i am aware of what it is, i was asking about the tranny difference, thanks though.

Ben
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Old 01-18-2005, 01:17 PM   #17
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it's not an STI 5 speed. same wrx gears with a different final drive. that is it...nothing reinforced by it.
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Old 01-18-2005, 02:20 PM   #18
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Quote:
Originally Posted by latinskllz
it's not an STI 5 speed. same wrx gears with a different final drive. that is it...nothing reinforced by it.
Are you talking about the FXT tranny?

If so, that's contrary to both what SOA says and other people's impressions. I'm pretty sure it's reinforced beyond a WRX tranny. Otherwise you'd have a ton of shattered trannys out there.
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Old 01-18-2005, 07:12 PM   #19
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latinskllz is right. Check around in the Tranny Forum because somewhere there was mentioned this stuff. Same tranny as a WRX but different final drive. Hence why a FXT is faster.


Eric
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Old 01-18-2005, 07:18 PM   #20
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besides, a FXT has the same motor as an STi w/ different ECU and turbo. It makes much more power than a WRX, and if it was the same tranny, it would break MUCH more often.
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Old 01-18-2005, 07:21 PM   #21
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doesnt the 4.44FD help keep the tranny from abusorbing all the shock, i forget why but i was reading that somewhere.

what does a FXT tranny go for?
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Old 01-18-2005, 08:09 PM   #22
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Quote:
Originally Posted by tooocool49723
besides, a FXT has the same motor as an STi w/ different ECU and turbo. It makes much more power than a WRX, and if it was the same tranny, it would break MUCH more often.
FXT has an STi motor, yes. It only makes 210 hp though which is less than a WRX but also slightly more torque at 235 ft lbs. It is the same tranny as a WRX but, like I said before, it has a different final drive (4.44 v. 3.90) making the FXT accelerate a lot quicker.

The shorter gearing helps get the power down faster and perhaps "absorbs" the shock better.


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Old 01-18-2005, 08:49 PM   #23
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Okay, so maybe the transmission case was strengthened and redesigned, but I'm pretty sure the ratios are the same as a WRX with a final drive of 4.44
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Old 01-31-2005, 12:09 AM   #24
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Quote:
Originally Posted by tooocool49723
besides, a FXT has the same motor as an STi w/ different ECU and turbo. It makes much more power than a WRX, and if it was the same tranny, it would break MUCH more often.
More power doesn't necessarily break a tranny. It can be: driving habits, how the torque curve is on a car, etc.

the reason why the FXT are not breaking that much is because how linear the torque curve is on the car. With a turbo'd RS with high compression, the torque curve climbs up really fast and that breaks trannies, if not contributes to it.

One nice feature about the fxt tranny i believe is on there is the triple cone synhros on 1st and some of the other gears to ease shifting. Other than that, it is a wrx gear ratio'd box and it appears to be the same box without webbing with the 4.44 final drive.

i have seen one in person and the case doesn't look like it has extra webbing...

Just some food for though.
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