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Old 09-27-2012, 03:30 AM   #1
subi400
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Default 4.11 ring and pinion into a 6 speed case?

Ok,

So i have done some searching and haven't been able to find what I am looking for. From what I know, Rallyspec makes a 4.44 front diff I believe for the sti. Get a R160 4.44 from a forester xt and be set. Obviously going with an 04 sti transmission would be better because of the 1:1 transfer case for the center diff. Any way, I know about the nissan 4.11 R180 ring and pinion that can be swapped over to the sti rear R180. However, is there also a way to take the same 4.11 ring and pinion from the nissan R180 and swap that in place of the 3.9 ring and pinion in the sti front diff?

This is the 6 spd I want to have built by combing these two gear sets from RalliSpec Albins 6 Gear Subaru 6MT Helical Synchro Set $6100
(Ratios -- 3.36 / 2.46 / 1.88 / 1.50 / 1.24 / 1.04) and RST-F145kit High Speed 2nd-6th Ratio Conversion W/ REM ISF $1325 (Ratios -- STD / 2.235 / 1.521 / 1.137 / 0.891 / 0.707)

to get this --> (ratios-- 3.36 / 2.235 / 1.521 / 1.137 / 0.891 / 0.707

Would be a sweet setup if possible
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Old 09-29-2012, 04:02 AM   #2
subi400
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Bumping this up...

Anyone with some ideas?
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Old 09-29-2012, 12:13 PM   #3
FuJi K
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What did you want to use from each gear set? What are you trying to shoot for?

We run the regular Legacy Spec B gear set and it works just fine.
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Old 09-29-2012, 12:23 PM   #4
Ioku
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In short no, you can not swap the ring and pinion from a r180 rear diff in place of the front diff in the case the pinion gear is part of the secondary gear shaft.
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Old 10-06-2012, 01:58 AM   #5
subi400
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Quote:
Originally Posted by FuJi K View Post
What did you want to use from each gear set? What are you trying to shoot for?

We run the regular Legacy Spec B gear set and it works just fine.
I combine those two first gear sets to get this: (ratios-- 3.36 / 2.235 / 1.521 / 1.137 / 0.891 / 0.707


Quote:
Originally Posted by Ioku View Post
In short no, you can not swap the ring and pinion from a r180 rear diff in place of the front diff in the case the pinion gear is part of the secondary gear shaft.
I understand that Is there a way to have a 4.11 ring and pinion made or fitted to the 6 spd front diff? I believe the 6 spd main shaft is slightly larger than the 5 spd main shaft so the rs 4.11 front diff ring and pinion is out. Or is it?
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Old 10-06-2012, 02:18 AM   #6
STIll inspired
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I personally looked into this previously. I wanted dccd and utilize 4.11 fd. I intended to use a jdm 5spd. with a 4.11 fd sporting the earlier dccd. I wanted to use the r180 for strengthening purposes as I have heard of r160 getting thrashed to bits at moderate power levels. As for the six speed the front diff would have to be a custom part which you may be able to have made, but I am not sure. Unfortunately, I changed my own course of action before attempting to piece together a 4.11 r180 for the subaru so i don't know how the ring and pinion would compare nissan to subaru; this was due to the strength of the 6spd and gas mileage that would have resulted from the short gearing (i opted for a standard 6spd and standard gear ratio). I personally don't know what your application for this drivetrain is, but it will be super short but lots of fun. i can tell you the front diff is for sure different then the 5spd version.
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Old 10-06-2012, 08:12 PM   #7
FuJi K
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Quote:
Originally Posted by subi400

I combine those two first gear sets to get this: (ratios-- 3.36 / 2.235 / 1.521 / 1.137 / 0.891 / 0.707
You have 3.900 or 4.444. Choose one.

What's your application? Revving high?
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Old 10-06-2012, 10:46 PM   #8
subi400
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Quote:
Originally Posted by STIll inspired View Post
I personally looked into this previously. I wanted dccd and utilize 4.11 fd. I intended to use a jdm 5spd. with a 4.11 fd sporting the earlier dccd. I wanted to use the r180 for strengthening purposes as I have heard of r160 getting thrashed to bits at moderate power levels. As for the six speed the front diff would have to be a custom part which you may be able to have made, but I am not sure. Unfortunately, I changed my own course of action before attempting to piece together a 4.11 r180 for the subaru so i don't know how the ring and pinion would compare nissan to subaru; this was due to the strength of the 6spd and gas mileage that would have resulted from the short gearing (i opted for a standard 6spd and standard gear ratio). I personally don't know what your application for this drivetrain is, but it will be super short but lots of fun. i can tell you the front diff is for sure different then the 5spd version.
Thanks for your comments The 4.11 ring and pinion from a nissan R180 does fit in a subaru sti R180 rear diff as there is a guy on here selling a nissan 4.11 R180 rear diff and said it does work. I plan on having an NA eg33 built, revving to 8500 or so and putting out around 400-425 at the crank. Putting this engine in my 98 impreza will already kill some of the gas mileage this I know... I just want something middle of the road like the 4.11 even if I have to have a custom front 4.11 ring and pinion made for the sti 6 spd. And if I find someone to make one then I'll give it a try.

Quote:
Originally Posted by FuJi K View Post
You have 3.900 or 4.444. Choose one.

What's your application? Revving high?
3.9 is fine, but why not do something different for a 6 spd?? If I can get the custom 4.11 ring and pinion for the sti front diff I'll try it. If at the end I can't do the 4.11 I'll just do the standard 3.9 then The car will be driven some dd but more so for spirited and the occasional drag strip run.

Last edited by subi400; 10-06-2012 at 10:52 PM.
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