rx8 rearend gears - Page 2

01-14-2008, 03:18 PM

#26

staticlag

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Quote:

Originally Posted by savedsol

It's got a new trans too and nobody knows the ratios. They are probably changed to match the diff. No way Mazda is going to take a bigger hit from the EPA.

True, I went from 19mpg in city to 17mpg in city after my final drive swap.

Whatever the case it will definitely give the rx8 the advantage in autocross where the "swap parts between model years" are hazy

Meaning we could run 4.77 gears and get away with it legally.

Autox really is the best place for 4.77 and 5.12 gears on this car.

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01-14-2008, 03:46 PM

#27

Mikeluvs8

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Quote:

Originally Posted by staticlag

Cause in the mustang the differential pumpkin is easily accessible from the rear of the car, unscrew one cover and you can take out the final drive gear.

On the rx8 the rear suspension must be completely disassembled and the differential physically taken out of the car.

Apparently Knightsports is making a 4.77 also but its the same thing as the FEED.

and theres always the Mazdaspeed 5.12 gear but its like $1200 or something.

ANYONE HAVE THE 5.12 MAZDASPEED GEARS INSTALLED????

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03-16-2014, 05:11 PM

#28

KillTym420

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Want diff gears need to bring this thread to life with new info please bump

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03-17-2014, 03:13 PM

#29

reddozen

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There is no new info...
S1 RX8 - 4.44
S2 RX8 - 4.77
Mazda Speed gears - 5.12

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08-12-2019, 01:54 PM

#30

DaBourg

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Does anyone have a good source for a 5.12 rear diff? I am replacing my 4.77 and would like to have a reliable unit to install.

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08-12-2019, 02:48 PM

#31

TeamRX8

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after they sold out there wasn’t enough demand to justify running another batch

some people call it 5.11 or 5.1, but it was actually 5.125. You’re just going to have to constantly keep searching the web and hope you can get to the rare one that pops up once in a long while before someone else does.

.

Last edited by TeamRX8; 08-12-2019 at 02:50 PM.

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08-12-2019, 03:00 PM

#32

TeamRX8

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Have no idea about this company or whether the in stock listing is accurate, you’ll just have to ask them:

Mazda RX8 - Transmission - Gearsets - The Mazda Zoom Zoom Store

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08-12-2019, 04:06 PM

#33

reddozen

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Took me a while to find mine. You're going to be running 80mph at like 5k RPM. top end and cruising will suffer, but it's nice in really twisty mountain roads. Honestly not the greatest for a street car, and pretty rare.

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08-12-2019, 09:24 PM

#34

TeamRX8

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Nice, practicing early for the reality of 20B gas mileage, lol

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08-14-2019, 11:01 AM

#35

reddozen

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Quote:

Originally Posted by TeamRX8

Nice, practicing early for the reality of 20B gas mileage, lol

hahah no kidding. I'm not sure what finial drive I want to run with the 20b. I can go pretty low having 750WHP. It'll have a 370z trans in the car.

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08-14-2019, 05:49 PM

#36

TeamRX8

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Build it first, then I will co ... oh, you get the idea

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11-05-2019, 11:37 AM

#37

Diyman25

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I have 4.777 install with S1 Transmission
Greart stuff until u are cruising on highway !!!

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03-12-2020, 10:10 AM

#38

DaBourg

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Thanks for the help with the 5.11 diff locate. I installed it over the winter and will race with it this year.

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03-12-2020, 09:23 PM

#39

TeamRX8

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On eBay a user named “nodlaww” in Australia sells new 5.375 and 5.8 ring & pinion gears for $800 AUD. For another $100 AUD you can get the 5.1 gear set and then it’s another $103 AUD to ship. That’s like $600-$700 USD shipped.

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