Longer Gears - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

trsiidno · 02-01-2015, 03:37 PM

My car is FI but I feel like the gears arent long enough. What option are there for me since I hit 148 pretty often and it starts slowing down drastically there. I will be doing e85 so power isnt gonna be a problem. And if right now I just have 330 hp how much will it affect the speed of the car for the time being not e85.

slicktop · 02-01-2015, 04:04 PM

Grab yourself an M85 differential out of a 02-05 IS300.

3.73 FD as opposed to the stock FT86 being 4.10.

EDIT: Not terribly hard to find, but they aren't plentiful. I bought mine for $575 shipped. It is a *direct* swap. You need to pull the IS300 axle shafts out, and the rest is straight bolt in.

kodyo · 02-01-2015, 04:30 PM

Agree with what slicktop is saying. Pulled my diff out of an IS300, but it was only $250 for mine. If you live in a big city (Houston for me), there are quite a few for sale if you call around.

M98 diff will work as well, but will have a 3.9 FD in it instead of the 3.73 tha the M85 has.

Mike Brz · 02-02-2015, 01:57 AM

What is the stock gear ratio?

Digitalanalog · 02-02-2015, 03:25 AM

Read post #2

cdrazic93 · 02-02-2015, 03:56 AM

@Dipstik-sportech

Dipstik-sportech · 02-02-2015, 06:22 PM

You rang!!! I've done the 3.73 diff swap. For forced induction it's almost a must do. Makes highway pulls a much less frantic experience lol, less shifting and more speed per gear.

trsiidno · 02-03-2015, 07:52 PM

Quote:

Originally Posted by slicktop

Grab yourself an M85 differential out of a 02-05 IS300.

3.73 FD as opposed to the stock FT86 being 4.10.

EDIT: Not terribly hard to find, but they aren't plentiful. I bought mine for $575 shipped. It is a *direct* swap. You need to pull the IS300 axle shafts out, and the rest is straight bolt in.

So to do this install is there a diy what exactly do i need to buy to get this fully swapped.

Dipstik-sportech · 02-03-2015, 07:56 PM

Its 4 bolts and two axles, you want an is300 diff tagged m85

trsiidno · 02-03-2015, 08:02 PM

Quote:

Originally Posted by Dipstik-sportech

Its 4 bolts and two axles, you want an is300 diff tagged m85

Thats all i need? Is just the differential? Whats the normal price for one too

Dipstik-sportech · 02-03-2015, 08:07 PM

I paid $600 for mine. It's a whole differential unit so u just pop the axles, remove the driveshaft and take the 4 mount bolts out and replace it with the is300 one.

trsiidno · 02-03-2015, 08:14 PM

I dont get how any of this works but i have a guy that sells the diff for that car do i just say i need the m85 differntial and thats it?

trsiidno · 02-03-2015, 08:14 PM

Quote:

Originally Posted by Dipstik-sportech

I paid $600 for mine. It's a whole differential unit so u just pop the axles, remove the driveshaft and take the 4 mount bolts out and replace it with the is300 one.

Just checking read the post above

slicktop · 02-03-2015, 08:49 PM

Quote:

Originally Posted by trsiidno

Just checking read the post above

It's literally bolt in. The transfer case/pumpkin is the exact same unit with different gearing inside.

Google "frs differential" and google "m85 differential". They're the same *exact* transfer case. On the M85, you will see the axle stubs where the axles go in. Those litereally pull out and you install it.

I had questions and @Dipstik-sportech helped me out because I couldn't believe it was literally drop in. It was. I don't know how else to put it.

EDIT: Look at my build thread, I have some pics there.

02-01-2015, 03:37 PM	#1
trsiidno Senior Member Join Date: Dec 2014 Drives: . Location: . Posts: 143 Thanks: 4 Thanked 4 Times in 4 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Longer Gears My car is FI but I feel like the gears arent long enough. What option are there for me since I hit 148 pretty often and it starts slowing down drastically there. I will be doing e85 so power isnt gonna be a problem. And if right now I just have 330 hp how much will it affect the speed of the car for the time being not e85.

02-02-2015, 03:56 AM	#6
cdrazic93 Junior Join Date: Aug 2013 Drives: a car Location: Probably at school Posts: 4,341 Thanks: 3,184 Thanked 2,512 Times in 1,502 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	@Dipstik-sportech __________________ "Ah! What music! They could have never imagined, those pioneers who invented the automobile, that it would posses us like this, our imaginations, our dreams. Men love women, but even more than that, men love CARS!"-Lord Hesketh

02-02-2015, 06:22 PM	#7
Dipstik-sportech Senior Member Join Date: Oct 2012 Drives: 2013 BRZ satin white pearl sportech Location: Thunder Bay Ontario Canada Posts: 1,813 Thanks: 842 Thanked 911 Times in 576 Posts Mentioned: 43 Post(s) Tagged: 0 Thread(s)	You rang!!! I've done the 3.73 diff swap. For forced induction it's almost a must do. Makes highway pulls a much less frantic experience lol, less shifting and more speed per gear. __________________ 2013 SWP BRZ sportech. 11.11sec@129.01mph, 511whp on e70. FullBlown base kit, FullBlown built 9.5:1 engine, GTX3076R GEN2 turbo, 1700cc Bosch injectors, FullBlown flex fuel kit, FullBlown radiator and oil cooler, FullBlown custom 3" dual exit exhaust, act xtreme clutch, whiteline diff and subframe inserts, BC Racing coilovers, hotchkiss 18mm rear sway, is300 3.73 differential ... Never finished

02-03-2015, 07:56 PM	#9
Dipstik-sportech Senior Member Join Date: Oct 2012 Drives: 2013 BRZ satin white pearl sportech Location: Thunder Bay Ontario Canada Posts: 1,813 Thanks: 842 Thanked 911 Times in 576 Posts Mentioned: 43 Post(s) Tagged: 0 Thread(s)	Its 4 bolts and two axles, you want an is300 diff tagged m85 __________________ 2013 SWP BRZ sportech. 11.11sec@129.01mph, 511whp on e70. FullBlown base kit, FullBlown built 9.5:1 engine, GTX3076R GEN2 turbo, 1700cc Bosch injectors, FullBlown flex fuel kit, FullBlown radiator and oil cooler, FullBlown custom 3" dual exit exhaust, act xtreme clutch, whiteline diff and subframe inserts, BC Racing coilovers, hotchkiss 18mm rear sway, is300 3.73 differential ... Never finished

02-03-2015, 08:07 PM	#11
Dipstik-sportech Senior Member Join Date: Oct 2012 Drives: 2013 BRZ satin white pearl sportech Location: Thunder Bay Ontario Canada Posts: 1,813 Thanks: 842 Thanked 911 Times in 576 Posts Mentioned: 43 Post(s) Tagged: 0 Thread(s)	I paid $600 for mine. It's a whole differential unit so u just pop the axles, remove the driveshaft and take the 4 mount bolts out and replace it with the is300 one. __________________ 2013 SWP BRZ sportech. 11.11sec@129.01mph, 511whp on e70. FullBlown base kit, FullBlown built 9.5:1 engine, GTX3076R GEN2 turbo, 1700cc Bosch injectors, FullBlown flex fuel kit, FullBlown radiator and oil cooler, FullBlown custom 3" dual exit exhaust, act xtreme clutch, whiteline diff and subframe inserts, BC Racing coilovers, hotchkiss 18mm rear sway, is300 3.73 differential ... Never finished

02-01-2015, 04:04 PM	#2
slicktop Senior Member Join Date: Mar 2013 Drives: 2013 Raven FRS 2JZ-GTE/V160 swapped Location: Hampton, VA Posts: 960 Thanks: 376 Thanked 623 Times in 315 Posts Mentioned: 18 Post(s) Tagged: 0 Thread(s)	Grab yourself an M85 differential out of a 02-05 IS300. 3.73 FD as opposed to the stock FT86 being 4.10. EDIT: Not terribly hard to find, but they aren't plentiful. I bought mine for $575 shipped. It is a direct swap. You need to pull the IS300 axle shafts out, and the rest is straight bolt in.

02-01-2015, 04:30 PM	#3
kodyo Senior Member Join Date: Jan 2013 Drives: Scion FR-S Location: Los Angeles Posts: 686 Thanks: 597 Thanked 256 Times in 173 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	Agree with what slicktop is saying. Pulled my diff out of an IS300, but it was only $250 for mine. If you live in a big city (Houston for me), there are quite a few for sale if you call around. M98 diff will work as well, but will have a 3.9 FD in it instead of the 3.73 tha the M85 has.

02-02-2015, 01:57 AM	#4
Mike Brz Senior Member Join Date: Jan 2015 Drives: 2013 BRZ Location: NY Posts: 232 Thanks: 82 Thanked 20 Times in 16 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	What is the stock gear ratio?

02-02-2015, 03:25 AM	#5
Digitalanalog Senior Member Join Date: Mar 2014 Drives: '13 BRZ Limited, '95 BMW M3 Location: Colorado Posts: 104 Thanks: 13 Thanked 67 Times in 25 Posts Mentioned: 0 Post(s) Tagged: 2 Thread(s)	Read post #2

02-03-2015, 08:14 PM	#12
trsiidno Senior Member Join Date: Dec 2014 Drives: . Location: . Posts: 143 Thanks: 4 Thanked 4 Times in 4 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I dont get how any of this works but i have a guy that sells the diff for that car do i just say i need the m85 differntial and thats it?

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