So ive been doing research on the 4.77 rear differential gears for the series 1 rx8. I have a 08 GT with the 4.44. i talked to a guy who did a swap with the series 2 diff and put it on his series 1 he said all he needed to do was swap the mounting bracket. F'n awsome called mazda and the race and pinion 991$ and the whole diff is 2000 PLUS. so i did more research and people say that the honda s2K (S2000) will work and some say nahh and i also read certain kia race and pinions will work and mazda makes both honda and kias diffs JAPAN LOVE haha so i havnt been able to find any aftermarket parts and not sure about the kia honda thing i no i can look for someone parting one out but im purchasing this with my tax money so i still got a month of research anybody any ADVISE EXPERIENCE

p.s. if u think i shouldnt swap to 4.77 im not looking to hear why i shouldnt i have my mind set

 

Corksport is up in your area. You should contact them about making the change over. I know a friend that got an exchange rear diff from Mazmart, but shipping charges would be a lot for you.

 

sweet ill give a call never heard of them and im pretty sure i checked mazmart but ill do it up again thanks

 

what's a race and pinion?
Honda and Kia parts don't work.

It may be less expensive to contact corksport or mazmart and get a full 2009+ differential instead of buying the individual parts, labour costs money and it's not a quick job for most mechanics.

 

I ment ring and pinion its the guts of the differential and it's 1000 cheaper to get the guts then to get the whole diff but would e cheaper to get the diff from a part out...mazmart has the pinion and stuff for 800 & 25 for shipping
And ur right not a quick job but I've done a 3.73 swap for my Camaro like 4 years ago it was a pain but well worth it

 

The biggest pain of such a job is setting the clearances right, especially if you can only try a couple of sleeves\bearings at a time. If you can do it then just find the parts and use the workshop manual as a reference!

 

you are not capable of installing the R&P yourself, it will be cheaper to buy a good used 2009+ LSD differential. You can then either try to sell the 4.44 diff or hold onto it and swap it back and sell the 4.77 diff later if you sell the car

 

You can still buy brand new as a genuine assembly for $2K USD, but, not for much longer.

RS08-27-100H 4.777 Complete Diff Assembly (Series 2 MT)

Paul from Mazmart had or has a low mileage complete unit FS...probably gone by now?.

 

Mazda has more than one style of differential, the Rx8 uses the 8" ring gear (P type), which is common to the Rx8, FD and FC turbo cars (except the FC uses a weird long pinion), and maybe the 90's MPV/929 as well.

the Na cars from 1970-1992 use a 7" diff (M type), the Rx2/3/4/5/7, 1990-2005 Miata, etc.

the 90's Kia Sportage uses a 7" diff that is a copy of the Mazda M type, so you can use the Kia's 4.77 in an NA Rx7. Kia licensed the Mazda design, and made it themselves.

the S2000 uses a Mazda diff too, some googling reveals that its also the M type/7" design, which is why its fragile @250hp...

 

Mazmart only has the ring and pinion not the complete set and team rx8 I agree it is a very touchy build and I'm going to get the whole diff and keep my 4.44 as spare thanks everyone for your advice j9fd3s thanks so much for the knowledge

 

If it were me, I would get one from Car-Part.com--Used Auto Parts Market
Search under Carrier, and you will see 4 manual transmission units available.
One for $450, one for $625, one for $750, and the last one for $1500.

But, that's just me.

BC.

 

Mazmart had the complete unit just before Christmas (Nov 28th), for $1000, but he must of sold it as he soft deleted the FS thread ''09-11 4.77 DIff reduced'' ..(thread is still there for Mods to see).

I would be somewhat careful selecting 'what' Diff Assemblies will actually fit in an RX-8, the Diffs are not made by Mazda but by a very long term supplier, who do other RWD applications for other Japanese /other car brands/plants.

The FD RX-7 ,RX-8 and NC Miata use the 4 Stud/Nut Alloy Hanger design on Diff Case then hung by outer two bolts onto rear Sub Frame.

1991-1995 HD 929 also use the same Diff, but mounting it will be an issue.

All these have the same Axle diameter.

Even an NC Miata/MX-5 LSD will fit, but, it is not as heavier duty as the FE and FD, and could also be Prop Shaft length issues.

Yeah, I would stay with FE.

 

Not bad, but for another $575 you can get brand new 4.777

 

most drive train shops will charge several hundred dollars to install it, but unless you are also planning to change the LSD it doesn't make much sense over the cost of a used one, it would be silly to buy a new one from a dealer and you only want to use an actual RX8 assembly. Didn't really address the other fitment idea because it's just BS 1+1=3 internet dumbassery just like the idea the transmission from S2000 etc. will fit blah blah blah. If you ever took one look at the other trans and diffs you can quickly see they are not the same in many ways.


.

 

Most of us who responded passed on the option of using non-RX-8 parts, if you didn't notice.

BC.

 

Last time I read the OP is after a 4.777 complete Diff, this is only available in LSD, and only ever used in S2 6MT.

Yes the 'R type' 4.777 Ring and Pinion only set can be bought new on-line for $780, or a complete KIT with new Bearings, all Seals and CWP new for $900.

BC, IMO trying to find and install any non RX-8 gear is only going to end in crap.

Look it all depends on what is found, but as said previously they may 'look' the same, but can/will the PP Frame connect?, will the prop shaft connect?.

Unless someone knows 100% then it can become and expensive nightmare.

BTW: Mazda lists the actual Diff Carrier as also being different between series 1 and 2, not certain on what the exact differences are.

 

I must not have been clear with my words...

passed on = passed by = ignored = didn't even bother discussing.

BC.

 

Sorry, I got u ..

 

Bump.

Does anyone know if the S1 4.444 diff swap perfectly into a S2? An opportunity has arisen for me to swap diffs with a totaled S2. The S1 diff must be able to fit and work perfectly though.

I'm not sure if the S1 mounting bracket will accommodate an S2 chassis?

 

you need the S2 mounting bracket, then it bolts right in

just for cleaning up this whole silly thread from several years back, the R&P gears mentioned for all those other vehicles are too small. They will fit the Miata and early RX7 differentials, but usually require modification to do so.

The FD3 RX7TT and RX8 have the same larger gear size and the R&Ps and LSDs are interchangeable between them.


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My intension is to buy the 5.1 ring e pinion for my rx8 . Some one who runs with this .... Its happy ? About the fitment .... its neccesary to use something else .... other type of transmission fluid ? Who can give us some more informations .... ?

 

Is your RX8 a competition track car that needs to accelerate strong at 100+ mph? Otherwise why do you think this is a good idea on a street car?

 

in need of one willing to pay for shipping