So if the rx8 4.44 gears fit in the FD rear end and also fit in the s2000. and the front 4.778 gears from a 94-02 kia sportage 4x4 fit in the s2000, they should fit in the FD too right? you can get a new set for 292 right now , I'm gonna pick up a diff from the junkyard to try it out see if they fit in an auto FD diff I have


http://www.rx8club.com/aftermarket-performance-modifications-23/4-778-final-drive-$296-77054/

 

I wouldn't do 4.77's in a daily driver or a car you plan on taking on a highway trip, but yeah that should do the trick.

Later RX-8's had higher R&P's as well, that's another option.

Dale

 

some of that is wrong, the Kia is a 7" ring gear, so it fits the miata/NA rx7, i think the s2000 too.

 

i've heard about the kia R+P into n/a diffs but never into the TII, so no. that doesn't sound right.

 

yeah I have to look into it a bit more see how s2000 guys get the rx8 R & P to work.
I was thinking about it at work tonight , i'll probably just go with the rx8 4.44 or just stock 4.1 depends what i can find for cheap

The R & P are going into my spare FD chassis i'm building into a full track car. I got an auto diff in a trade, im just running nonsequential twins so i need all the mechanical advantage i can get

 

I have 2 sets of 4.10 r & p.

 

I've looked into that swap before - pretty sure it is like the others stated, those are 7" gears and don't fit an FD. That swap is mostly done with 1st Gens IIRC.

 

7" gear set, it will fit on N/A second gens.