Final Drive Discussion - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

JimmyMac · 08-25-2013, 12:05 AM

Hello all,

I know there are one or two threads discussion the Cusco final drive set, but I wanted to open one up for all final drives. Maybe we can offer some tips and tricks to the install as well has what shim kits were used. I'd like to know what the part numbers and brands of the shim kits are. I know a lot have asked and it fell on deaf ears. So maybe we can get it resourced here for everyone.

I hope to soon get one. Just not sure which.

So far we have:

Cusco
4.556

MFactory
4.44
4.67

There are a few other brands, but I have not been able to source them out yet. I've seen maybe a 3.9 and 4.3 in Japanese magazines, I'm just looking for the websites right now. If you know of any, please link them here. Thanks.

Pics would be cool too. Everyone loves pics!

Added: Gear ratios for each gear

1st : 3.626
2nd : 2.188
3rd : 1.541
4th : 1.213
5th : 1.000
6th : 0.767

Gear speed chart calculator: http://pw1.netcom.com/~sgalaba/mph.htm

Dustin · 08-25-2013, 12:19 AM

I too have been trying to find out part numbers on shims and stuff like that. I just ordered a final drive kit that I believe I'll be the first one to test. Before I post too much information I'll guinea pig my car first before posting my review of the kit. But to give a little bit of information, it is another 4.56 final drive gear set.

JimmyMac · 08-25-2013, 12:23 AM

Awesome! I heard a Nissan shim kit will work, but I forgot the part number for it.

Also, I notice a group buy for the MFactory set for cheap. But not many willing to jump in. I'd jump in on it now if I could get it at that price. The Cusco is costly, but I found it for under $900 in USA. I think a lot of USA dealers are over charging for it. I wish JapanParts had it for sale. Mark up on USA dealers seems to be several hundred dollars.

Dustin · 08-25-2013, 12:32 AM

If the money isn't burning a hole in your pocket, wait a bit. The kit I'm getting is priced very well and doesn't require a group buy. I just don't want to jump the gun and tell people to buy it without testing it first. And I wouldn't suggest for you to wait if it was only saving pocket change. The savings will be worth the wait if the product is good.

mtsui · 08-25-2013, 12:38 AM

I'm going to get 4.67 after my coilover, and now doing some research about the shim kit too, it's good to have a thread that talk about this.

JimmyMac · 08-25-2013, 12:52 AM

If you have the Scion FR-S Repair Manual.pdf downloaded from this site (5009 pages), starting on page 241 is where they take apart the rear diff. Link is here:

There is also a BRZ factory service manual floating around too on this site.

FT-86 SpeedFactory · 08-25-2013, 12:55 AM

We run the MFactory 4.67 in our race car. We can also add a shim kit to it which is OEM from Subaru.

Be wary of dealers selling this part who:

1. Don't even own an FR-S or know how this part works.
2. Can't supply a shim kit with it.

That goes for any final drive no matter the brand.

A 4.67 is pretty hefty for a daily driven car.

JimmyMac · 08-25-2013, 12:58 AM

Quote:

Originally Posted by FT-86 SpeedFactory

We run the MFactory 4.67 in our race car. We can also add a shim kit to it which is OEM from Subaru.

Be wary of dealers selling this part who:

1. Don't even own an FR-S or know how this part works.
2. Can't supply a shim kit with it.

That goes for any final drive no matter the brand.

A 4.67 is pretty hefty for a daily driven car.

Do you have a part number for this kit? Also, what exactly do you mean... hefty? I know it might not be "ideal" for interstate highway use. But around town I see no issues.

mtsui · 08-25-2013, 01:29 AM

how high is the rpm when its going 80 mph in 6 gear? the car is my daily drive, but I do track alot with this car as well!

JimmyMac · 08-25-2013, 01:36 AM

I'm looking that up now (rpm at 80 with 4.67), but I found this on Cusco site. Scroll down and you will see shim numbers. It would be nice to have @FT-86 SpeedFactory give shim kit numbers as well... hint hint.

http://www.cusco.co.jp/en/parts_prod...z_rear_di.html

Adeets · 08-25-2013, 02:07 AM

Where's the 3.8/3.9 final drives for us FI folks?

ft_sjo · 08-25-2013, 02:12 AM

Quote:

Originally Posted by Adeets

Where's the 3.8/3.9 final drives for us FI folks?

You can buy one from Toyota today for your car. Or from the Lexus parts bin.

Adeets · 08-25-2013, 02:16 AM

Quote:

Originally Posted by ft_sjo

You can buy one from Toyota today for your car. Or from the Lexus parts bin.

O rly, any idea whic cars they come out of by chance? (As I which cars have our xmission and the 3.8/3.9 final drive?)

JimmyMac · 08-25-2013, 02:56 AM

Quote:

Originally Posted by mtsui

how high is the rpm when its going 80 mph in 6 gear? the car is my daily drive, but I do track alot with this car as well!

Using this site to calculate speeds, http://pw1.netcom.com/~sgalaba/mph.htm

A stock 4.1 final at 80mph will be close to 3500 rpms in 6th gear with stock tire size.
With 4.67 final at 80mph it will be close to 4000 rpms in 6th gear with stock tire size.

So a jump in 500 rpms.

Added: Gear ratios for each gear

1st : 3.626
2nd : 2.188
3rd : 1.541
4th : 1.213
5th : 1.000
6th : 0.767

08-25-2013, 12:05 AM	#1
JimmyMac Senior Member Join Date: Aug 2012 Drives: 2013 FR-S, 2016 Miata Club Location: NC Posts: 785 Thanks: 183 Thanked 258 Times in 171 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	Final Drive Discussion Hello all, I know there are one or two threads discussion the Cusco final drive set, but I wanted to open one up for all final drives. Maybe we can offer some tips and tricks to the install as well has what shim kits were used. I'd like to know what the part numbers and brands of the shim kits are. I know a lot have asked and it fell on deaf ears. So maybe we can get it resourced here for everyone. I hope to soon get one. Just not sure which. So far we have: Cusco 4.556 MFactory 4.44 4.67 There are a few other brands, but I have not been able to source them out yet. I've seen maybe a 3.9 and 4.3 in Japanese magazines, I'm just looking for the websites right now. If you know of any, please link them here. Thanks. Pics would be cool too. Everyone loves pics! Added: Gear ratios for each gear 1st : 3.626 2nd : 2.188 3rd : 1.541 4th : 1.213 5th : 1.000 6th : 0.767 Gear speed chart calculator: http://pw1.netcom.com/~sgalaba/mph.htm Last edited by JimmyMac; 08-25-2013 at 03:02 AM. Reason: Added gear ratios for each gear

08-25-2013, 12:19 AM	#2
Dustin Twin Screw You Join Date: Nov 2012 Drives: 2013 Supercharged Whiteout FR-S Location: Burleson, Texas Posts: 1,231 Thanks: 464 Thanked 620 Times in 332 Posts Mentioned: 37 Post(s) Tagged: 0 Thread(s)	I too have been trying to find out part numbers on shims and stuff like that. I just ordered a final drive kit that I believe I'll be the first one to test. Before I post too much information I'll guinea pig my car first before posting my review of the kit. But to give a little bit of information, it is another 4.56 final drive gear set. __________________ My 86 Differential and Ring & Pinion DIY

08-25-2013, 12:32 AM	#4
Dustin Twin Screw You Join Date: Nov 2012 Drives: 2013 Supercharged Whiteout FR-S Location: Burleson, Texas Posts: 1,231 Thanks: 464 Thanked 620 Times in 332 Posts Mentioned: 37 Post(s) Tagged: 0 Thread(s)	If the money isn't burning a hole in your pocket, wait a bit. The kit I'm getting is priced very well and doesn't require a group buy. I just don't want to jump the gun and tell people to buy it without testing it first. And I wouldn't suggest for you to wait if it was only saving pocket change. The savings will be worth the wait if the product is good. __________________ My 86 Differential and Ring & Pinion DIY

08-25-2013, 02:07 AM	#11
Adeets OEDC Join Date: Oct 2012 Drives: Vortech 8.5psi 274WHP 2013 BRZ Location: Pa Posts: 619 Thanks: 117 Thanked 263 Times in 159 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	Where's the 3.8/3.9 final drives for us FI folks? __________________ My BRZ FI Build Visconti is like a Tick that sucks as much blood(money) as he can before you figure out he's there. please make sure to leave your experiences with visconti on his feedback thread located here: Visconti feedback

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08-25-2013, 12:23 AM	#3
JimmyMac Senior Member Join Date: Aug 2012 Drives: 2013 FR-S, 2016 Miata Club Location: NC Posts: 785 Thanks: 183 Thanked 258 Times in 171 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	Awesome! I heard a Nissan shim kit will work, but I forgot the part number for it. Also, I notice a group buy for the MFactory set for cheap. But not many willing to jump in. I'd jump in on it now if I could get it at that price. The Cusco is costly, but I found it for under $900 in USA. I think a lot of USA dealers are over charging for it. I wish JapanParts had it for sale. Mark up on USA dealers seems to be several hundred dollars.

08-25-2013, 12:38 AM	#5
mtsui Senior Member Join Date: Feb 2013 Drives: 135i Location: walnut Posts: 304 Thanks: 22 Thanked 30 Times in 26 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	I'm going to get 4.67 after my coilover, and now doing some research about the shim kit too, it's good to have a thread that talk about this.

08-25-2013, 12:52 AM	#6
JimmyMac Senior Member Join Date: Aug 2012 Drives: 2013 FR-S, 2016 Miata Club Location: NC Posts: 785 Thanks: 183 Thanked 258 Times in 171 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	If you have the Scion FR-S Repair Manual.pdf downloaded from this site (5009 pages), starting on page 241 is where they take apart the rear diff. Link is here: There is also a BRZ factory service manual floating around too on this site.

08-25-2013, 12:55 AM	#7
FT-86 SpeedFactory Join Date: Jul 2012 Drives: 2013 Scion FR-S Location: Des Moines, IA Posts: 7,694 Thanks: 1,298 Thanked 3,578 Times in 1,253 Posts Mentioned: 341 Post(s) Tagged: 5 Thread(s)	We run the MFactory 4.67 in our race car. We can also add a shim kit to it which is OEM from Subaru. Be wary of dealers selling this part who: 1. Don't even own an FR-S or know how this part works. 2. Can't supply a shim kit with it. That goes for any final drive no matter the brand. A 4.67 is pretty hefty for a daily driven car.

08-25-2013, 01:29 AM	#9
mtsui Senior Member Join Date: Feb 2013 Drives: 135i Location: walnut Posts: 304 Thanks: 22 Thanked 30 Times in 26 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	how high is the rpm when its going 80 mph in 6 gear? the car is my daily drive, but I do track alot with this car as well!

08-25-2013, 01:36 AM	#10
JimmyMac Senior Member Join Date: Aug 2012 Drives: 2013 FR-S, 2016 Miata Club Location: NC Posts: 785 Thanks: 183 Thanked 258 Times in 171 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	I'm looking that up now (rpm at 80 with 4.67), but I found this on Cusco site. Scroll down and you will see shim numbers. It would be nice to have @FT-86 SpeedFactory give shim kit numbers as well... hint hint. http://www.cusco.co.jp/en/parts_prod...z_rear_di.html

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