Anyone wanna trade their 3.9 for my 4.56 final drive? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

GrabTheWheel · 11-16-2018, 06:56 PM

I'm really looking for a 3.73 final drive for my LS swap but I'm having some trouble finding one. My 2nd choice would be the 3.9 from an auto 86. Would anyone be interested in trading their 3.9 for my 4.56 from Weir performance?

Mr_Eyo · 11-17-2018, 04:27 AM

ATs come w/ 4.1 stock

Drakiv · 11-17-2018, 05:46 AM

you can see if you can find an is300 M85 manual diff, those can swap in for our cars and come with a 3.73 gear if you are lucky enough to find a used M85. They have been known to handle around 700 WHP reliably.

Soloside · 11-19-2018, 10:24 AM

Quote:

Originally Posted by GrabTheWheel

I'm really looking for a 3.73 final drive for my LS swap but I'm having some trouble finding one. My 2nd choice would be the 3.9 from an auto 86. Would anyone be interested in trading their 3.9 for my 4.56 from Weir performance?

I have a OEM Auto whole pumpkin ready to be shipped if you want to swap.

GrabTheWheel · 11-19-2018, 11:39 AM

Quote:

Originally Posted by Soloside

I have a OEM Auto whole pumpkin ready to be shipped if you want to swap.

Does the auto come with a 3.9? Or just the same 4.1 with a different gear ratio?

Mr_Eyo · 11-19-2018, 05:41 PM

Quote:

Originally Posted by GrabTheWheel

Does the auto come with a 3.9? Or just the same 4.1 with a different gear ratio?

The latter. ATs have 2 overdrive gears and 4.1 FD. 2017+ MTs have 4.3 FD and one overdrive gear.

Spectral Entity · 11-19-2018, 06:01 PM

Quote:

Originally Posted by Mr_Eyo

The latter. ATs have 2 overdrive gears and 4.1 FD. 2017+ MTs have 4.3 FD and one overdrive gear.

What does that mean? I've never raced my car but when I played Forza, one of the things you could change was gear ratio, and I noticed that tweaking certain gears helped the top speed, but I don't know why.

x808drifter · 11-20-2018, 03:59 PM

Quote:

Originally Posted by Mr_Eyo

ATs 4.1 FD.

2017+ MTs have 4.3 FD

Removed all info he doesn't need.

DarkPira7e · 11-20-2018, 04:22 PM

Quote:

Originally Posted by GrabTheWheel

I'm really looking for a 3.73 final drive for my LS swap but I'm having some trouble finding one. My 2nd choice would be the 3.9 from an auto 86. Would anyone be interested in trading their 3.9 for my 4.56 from Weir performance?

I watched Ebay at least 2 days a week for about a year. Finally found an M85 IS300 diff for 350 shipped and nabbed it. They are seriously sought after and hard to get, but be vigilant and your efforts will be rewarded. Maybe someone will trade though, best of luck!

churchx · 11-20-2018, 10:37 PM

Mr_Eyo: are you sure? I thought that 4th is direct drive on our MT gearboxes, with both 5th & 6th being overdrive.

Mr_Eyo · 11-21-2018, 06:24 PM

Quote:

Originally Posted by churchx

Mr_Eyo: are you sure? I thought that 4th is direct drive on our MT gearboxes, with both 5th & 6th being overdrive.

https://www.google.com/url?sa=t&sour...=1542842628181

11-16-2018, 06:56 PM	#1
GrabTheWheel Senior Member Join Date: Feb 2018 Drives: 16' BRZ Location: California Posts: 362 Thanks: 76 Thanked 161 Times in 91 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Anyone wanna trade their 3.9 for my 4.56 final drive? I'm really looking for a 3.73 final drive for my LS swap but I'm having some trouble finding one. My 2nd choice would be the 3.9 from an auto 86. Would anyone be interested in trading their 3.9 for my 4.56 from Weir performance?

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11-17-2018, 04:27 AM	#2
Mr_Eyo Senior Member Join Date: Jul 2018 Drives: 2017 Toyota 86 Location: CA, USA Posts: 231 Thanks: 21 Thanked 33 Times in 29 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	ATs come w/ 4.1 stock

11-20-2018, 10:37 PM	#10
churchx Senior Member Join Date: Mar 2015 Drives: 2014 GT86 Location: Latvia, Riga Posts: 4,333 Thanks: 696 Thanked 2,085 Times in 1,436 Posts Mentioned: 53 Post(s) Tagged: 1 Thread(s)	Mr_Eyo: are you sure? I thought that 4th is direct drive on our MT gearboxes, with both 5th & 6th being overdrive.

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