The Transmission / Differential FAQ

[afgmoto1978]

Don't forget to add the JDM FD3S tranny with the .806 fifth gear. I will be adding an RX-8 4.44 lsd gears to my FD diff. Do you want pictures of the install or any usable info?

[Whizbang]

Originally Posted by afgmoto1978

Don't forget to add the JDM FD3S tranny with the .806 fifth gear. I will be adding an RX-8 4.44 lsd gears to my FD diff. Do you want pictures of the install or any usable info?

sure! make a thread and ill link it into the FAQ to keep clutter down. Can you verify this .806 gear?

[afgmoto1978]

Originally Posted by Gravity Fed

sure! make a thread and ill link it into the FAQ to keep clutter down. Can you verify this .806 gear?

http://www.ooparts-international.co....ion/index.html

FC3S RX-7 [1 - 3rd gear] R5M-D - 2.714 1.742 1.267 - -

FD3S RX-7 [1 - 3rd gear] R15M-D 2.714 1.742 1.267 - -

FC3S RX-7 [1 - 3rd & 5th gear] with Input Shaft R5M-D 2.578 1.772 1.289 1.000 0.821

FD3S RX-7 [1 - 3rd & 5th gear] with Input Shaft R15M-D 2.578 1.772 1.289 1.000 0.821

Stock JDM Gear Ratio Data - - 3.483 2.015 1.391 1.000 0.806

This is the Kouki Gear ratio, Zenki are different still due to the change is rim diameter.

I'm thinking of getting the OS Giken 3 Gear kit as well.

[TitaniumTT]

Originally Posted by afgmoto1978

I'm thinking of getting the OS Giken 3 Gear kit as well.

That's some really good info right there. As opposed to the OS Giken set, have you considered cryo-treating the internals?