Subaru 5 and new 6 speed cable shift info, The new 6 speed split case. Options

[partwerks]

From what I can find online the difference is the final drive.

WRX is 4.11
Forrester is 4.44

With the engine you are building Doug...you definitely don't want the 4.44.

What do those numbers translate to in the final drive?

[partwerks]

Subarugears.com has a lot of good information on Subaru gear ratios and a calculator.
Both the 5-speed and 6-speed split case have been made with 3.90, 4.11 and 4.44 final drive ratios. For me I choose the 3.90.

This is one comparison of the 5 and 6 speed ratios to give you an idea of the difference.
5MT non Turbo 3.45 / 2.06 / 1.45 / 1.09 / 0.78
6MT non Turbo 3.45 / 1.94 / 1.30 / 0.97 / 0.82 / 0.69

So is the MT5, or the 6 speed TY751, the better option?

[partwerks]

I haven't driven a 6-speed yet but my thought is if you already have a 5-speed it's not worth the upgrade but if your just starting a project it's worth considering. One advantage is the cable linkage is built into the transmission and you can use the Subaru shift lever. They are newer and easy to find low mile ones. The information I have found so far is first and second gears are wider and stronger than early 5-speeds, 1-4 is the same ratio, 5th is lower and the added 6th gives you lower RPM's at highway speed.

Do you have pictures of the shifter?
If it doesn't have a speed sensor, is the sensor, and magnet like some setup, another way of doing it?

[partwerks]

From what I can find online the difference is the final drive.

WRX is 4.11
Forrester is 4.44

With the engine you are building Doug...you definitely don't want the 4.44.

Which is better for lower rpm's in the road gear?

[76-914]

From what I can find online the difference is the final drive.

WRX is 4.11
Forrester is 4.44

With the engine you are building Doug...you definitely don't want the 4.44.

Which is better for lower rpm's in the road gear?

Given the 2 choices from above, the 4.11 would be. If your going 5 speed there are several 3.9 final drive transmissions and two 3.6. Here is a shopping list. https://www.rallispec.com/downloads/Transmi...hart_Public.pdf

[partwerks]

From what I can find online the difference is the final drive.

WRX is 4.11
Forrester is 4.44

With the engine you are building Doug...you definitely don't want the 4.44.

Which is better for lower rpm's in the road gear?

Given the 2 choices from above, the 4.11 would be. If your going 5 speed there are several 3.9 final drive transmissions and two 3.6. Here is a shopping list. https://www.rallispec.com/downloads/Transmi...hart_Public.pdf

I don't see any with a FD of 3.6. I only see one 3.7, but that year is a push style.

[partwerks]

From what I can find online the difference is the final drive.

WRX is 4.11
Forrester is 4.44

With the engine you are building Doug...you definitely don't want the 4.44.

Which is better for lower rpm's in the road gear?

Given the 2 choices from above, the 4.11 would be. If your going 5 speed there are several 3.9 final drive transmissions and two 3.6. Here is a shopping list. https://www.rallispec.com/downloads/Transmi...hart_Public.pdf

I didn't see any with the 3.6 final drive?

[76-914]

From what I can find online the difference is the final drive.

WRX is 4.11
Forrester is 4.44

With the engine you are building Doug...you definitely don't want the 4.44.

Which is better for lower rpm's in the road gear?

Given the 2 choices from above, the 4.11 would be. If your going 5 speed there are several 3.9 final drive transmissions and two 3.6. Here is a shopping list. https://www.rallispec.com/downloads/Transmi...hart_Public.pdf

I didn't see any with the 3.6 final drive?

They are 3.7 not 3.6. Probably about 2mph difference at 3300 rpm. There is a calculator on this site that will show you the engine rpm at "X" mph using whatever tire size you are running. I think once you see the minor difference you will not be so concerned with the difference. Which TY model number were you looking at that is a push style rather than the pull style?

[eric914]

How difficult would this be to put behind a type iv or a Porsche 6 ? I think some of the Subaru transmissions have pull clutch levers ,some have push levers. Flywheel,clutch and starter differences. Do people swap out the pedal assembles for hydraulic clutch types?

I had the same thought. I have a 3.2 6 in my car and fear really pushing it. Years ago, I started down the Suby conversion path and still have a 1998 JDM 2L WRX motor with a Kennedy engineered products motor adaptor plate and clutch sitting in the corner of the garage. I wonder if the 914 clutch disk would fit in the Suby clutch assembly?

[76-914]

How difficult would this be to put behind a type iv or a Porsche 6 ? I think some of the Subaru transmissions have pull clutch levers ,some have push levers. Flywheel,clutch and starter differences. Do people swap out the pedal assembles for hydraulic clutch types?

I had the same thought. I have a 3.2 6 in my car and fear really pushing it. Years ago, I started down the Suby conversion path and still have a 1998 JDM 2L WRX motor with a Kennedy engineered products motor adaptor plate and clutch sitting in the corner of the garage. I wonder if the 914 clutch disk would fit in the Suby clutch assembly?

Some people do switch out pedal assemblies but it isn't necessary. You can easily convert your 914 pedal cluster to hydraulic. You will use the old clutch tube as the conduit for the AN-3 hydraulic hose. Conversely you can convert the old cable system to work with a Subaru transmission. I don't recommend this as it is more difficult than converting to hydraulic and you are left with the problematic cable or clutch tube weld failing. (IMG:style_emoticons/default/beerchug.gif)

[kerensky]

I have a 3.2 6 in my car and fear really pushing it. Years ago, I started down the Suby conversion path and still have a 1998 JDM 2L WRX motor with a Kennedy engineered products motor adaptor plate and clutch sitting in the corner of the garage. I wonder if the 914 clutch disk would fit in the Suby clutch assembly?

Dibs on your 3.2? (IMG:style_emoticons/default/biggrin.gif)

[partwerks]

From what I can find online the difference is the final drive.

WRX is 4.11
Forrester is 4.44

With the engine you are building Doug...you definitely don't want the 4.44.

Which is better for lower rpm's in the road gear?

Given the 2 choices from above, the 4.11 would be. If your going 5 speed there are several 3.9 final drive transmissions and two 3.6. Here is a shopping list. https://www.rallispec.com/downloads/Transmi...hart_Public.pdf

I didn't see any with the 3.6 final drive?

They are 3.7 not 3.6. Probably about 2mph difference at 3300 rpm. There is a calculator on this site that will show you the engine rpm at "X" mph using whatever tire size you are running. I think once you see the minor difference you will not be so concerned with the difference. Which TY model number were you looking at that is a push style rather than the pull style?

Sounds like they only made the one I wanted for two years, but is the push style, and not the pull.
https://www.pmpautogroup.com/product-p/ty754vw7aa.htm

Is it possible to put a 3.7 FD, into a trans that has a 3.9?

[partwerks]

For example: Would this one work? Non-STI 6sp from 2015

https://www.ebay.com/itm/402674382802?epid=1039500073

That should work, it is a split case. I found no difference in the WRX Non STI to the Forester other than the price is a lot more than the Forester. I have yet to find gear ratios for these boxes and they maybe different between the Forester and WRX.

For reference here is a picture of the conversion parts I have from Subaru Gears out of Australia.

One more picture

So all Subaru transmissions are AWD, or do they make a FWD?
These parts convert the AWD?

[914Subaru]

Now there is a kit to use the STI transmission.
The STI transmission is the ultimate when it comes to Subaru boxes. There has been someone in this group that has made their own kit that requires some welding and advanced talent for sure. Now being easier I would consider this kit if I was to do another. Although a new engine transmission cradle would need designed.

[Chris914n6]

Sounds like they only made the one I wanted for two years, but is the push style, and not the pull.
https://www.pmpautogroup.com/product-p/ty754vw7aa.htm

Is it possible to put a 3.7 FD, into a trans that has a 3.9?

I was looking into that too. But it's really only 200 rpm at 90 mph in 5th and a few mph difference at redline in each gear. 10 mph at top speed. Not worth the trouble.
3.9 vs 4.4 that's a different story.

[ahycaramba]

From what I can find online the difference is the final drive.

WRX is 4.11
Forrester is 4.44

With the engine you are building Doug...you definitely don't want the 4.44.

I'm really confused (IMG:style_emoticons/default/confused24.gif) I been using the calculator on subarugears website. According to my calculations on a 5 speed manual trans why would you want a final drive of 4.44 or 4.11 that tops out early at 113 mph or so in 5th gear @ 5000 rpm but when you have a final drive of 3.54 or 3.9 that will get you a top speed of around 130 mph at 5000 rpm.
Am I missing something? STI and WRX run F/D of 4.11 or 4.44 and cost much more than 3.54 or 3.90. Shifting points on a F/D 3.90 or 3.54 seem to be more desirable than the 4.11 or 4.44.
am I wrong and would I be losing power / torque due to taller gears?