S2000 rear diff rebuild

[OMG.JAI xD]

Hi Guys,

The rear diff in my s2000 sounds like it's going to go.

Looking to rebuild it, though i'm not to sure exactly what parts i need to rebuild the rear diff. If anyone can advise on what parts i need to rebuild the diff and any recommended workshops in Sydney to go to, to get everything installed that would be great.

Any help on this would be appreciated.

Thanks.

[pilotb777_300]

What symptoms is your diff showing to make you think its about to go ?

As for parts list, it all depends on whats wrong with the diff... could be crown and pinion only or at worst you may need a new housing and LSD unit...

[OMG.JAI xD]

Rear end appears to be making a whirring noise when driving at about 60 k's. Kind of makes a whining noise at about 90 k's and up, only noticeable when the soft top is up.

Could be anything but i was advised that it's the diff?

[pilotb777_300]

Does it whine under load only or when your coasting in neutral as well ?

My diff whines sightly as well only under load at certain load conditions... you cant hear it with the top down but with the top closed u can hear it slightly. It has been like this for close to a year with no problems... hasnt gotten worse or better. I had the car at honda to check if all was OK both a senior service man and the forman took the car for a long drive and coudlnt fault it. They said all S2000's are noisy to some extent.

if it is whining to the point where it is annoying you, it could be the backlash in the diff is out or ur crown/pinion are worn and need replacement. a replacment of the crown wheel and pinion would set u back about 1500-2000 including labour. Not sure who can do it for you though in sydney as I'm based in melb.

First thing I would do though is replace the fluid in ur diff and have a look for any large metal chunks in the old oil. That would be a good sign if things are about to self distruct or not.

[h3nno]

Is it in the centre or to the left or right, Could be a wheel bearing?

[ducbui91]

i think u need to shed some weight jai coz its the only reason thats killing ur diff hahah

[ducbui91]

i think ive got that problem too but i thought it was coz of my 20inch rims

[OMG.JAI xD]

i think ive got that problem too but i thought it was coz of my 20inch rims

Thanks for the qucik response boys.

Duc u fuhnny kunt, j reckons its the wheel bearing but i'm gna start replacing parts of the diff just incase.

Hows the s2k cuzz???

[OMG.JAI xD]

Any further info would be great !!

[JAP-S2K]

If your looking to at changing your final drive ratio, then

Kia 4.777 from Holden/Kia Hornsby approx $500
MT&C Engineers Cryo-treatment of gears(if you want) Approx $100
Hornsby diffs rebuild $450-$600 including a solid pinion collar, fluids, bearings, seals.

That will pretty much solve all your diff issues without being F/I

[pilotb777_300]

If your looking to at changing your final drive ratio, then

Kia 4.777 from Holden/Kia Hornsby approx $500
MT&C Engineers Cryo-treatment of gears(if you want) Approx $100
Hornsby diffs rebuild $450-$600 including a solid pinion collar, fluids, bearings, seals.

That will pretty much solve all your diff issues without being F/I

Just out of curiosity... whats the stock crown and pinion worth to buy from honda ? and if you wana buy the same ratio as stock but in the kia brand whats the price difference ?

[ducbui91]

When ya free let me come c ur car and see whether it's the same noise

[JAP-S2K]

Just out of curiosity... whats the stock crown and pinion worth to buy from honda ? and if you wana buy the same ratio as stock but in the kia brand whats the price difference ?

Expensive. OEM from Honda will vary from approx $1400-$1500 over the counter. Kia doesn't make parts nor does Honda, the parts come from the same parts manufacturer in this case, some Mazda models included, so 4:44's can be had from Mazda too. Kia doesn't sell 4:11's, and only offer 4:77's for there Sportage. So technically your not placing Kia parts in your diff, your placing another option from the same parts manufacturer.

[OMG.JAI xD]

YLD-S2K thanks for the info !!

[tamay_s2k]

i had a similar issue with my diff
and 2 weeks ago i blew it.
the whole thing
half the crown is missing, ring has chips in it
diff casing snapped.
i had a light whirring sound aswell on decel at around 60 kms then it turned into a constant.
snapped wen i was shifting normal around a round about.
i brought 4.44 gears from puddydad on s2ki for 800 delivered
and now im waiting on a kaaz 1.5 way lsd
my full rebuild is costing liek almost 4k including new casing and bearings aswell and labour

[OMG.JAI xD]

Hi Guys,

Taken on board your advice, picking up a kia 4.77 final drive (crown + pinion), brand new oem diff bearings (front, rear), oem crush collar and all seals. Will have all this tomorrow.

Not 100% sure if it's the diff but i know these things arent the best so imma be on the safe side and replace the diff parts anyway. This is my daily so i can't afford to break down.

Anyway boys will let you know how this all goes.

[vyets]

getting a 4.77 does not make your diff stronger..

[zhong]

^^^ I agree w/vyets that it won't make it stronger, but having a NEW crown/pinion should be better than the 15year old one that is currently in there anyway. May as well do the whole thing while it's open right? + It gives you better acceleration! :D

Do you mind giving us a price break down on your new purchases OMGJAI? Don't forget to purchase the "yellow box" to correct your speedo.

Peace.

[OMG.JAI xD]

hey man,

Whats this yellow box?

No one on this thread has stated that this will make the diff stronger and i did not state that i'm looking to make the diff stronger. I just want to fix the issue with my car that's all.

Anyway, i'm purchasing the lot brand new for 800 bux by the way. :D

[zhong]

I really wanna know how much your getting your Gears for from KIA.

Yellow box is a add in thing for your speedo to re-calibrate the speed calculation since you have changed your gear ratio.. You can purchase this from I forgot what's his name on S2ki but if you google it, you'll find it.

[tamay_s2k]

the only way to strengthen the diff is 2 change ur casing to puddymod or comptech housing and probs the lsd unit itself.
"OMG.JAI" u paid 800 for ur 4.77s?
i paid the exact same price for my 4.44s including cryogenic treatment

[OMG.JAI xD]

Hey man.

Yeah 800 bux was for the 4.77 + oem bearings etc etc etc

whats cryogenic treatment btw ??

[euromandeluxe]

Basically expose the parts to super cold temps. Hardens the steel but also makes it more brittle.

[OMG.JAI xD]

Hi all, thanks for the info everyone has been very helpful here.

Quick questions, changing the final drive to 4.77 how much will my speedo be off by? i.e. if the speedo is showing 60kmph how fast am i acutally going ??

[vyets]

It's abit of a double edge sword.

I don't remember how much mine was off but its off by about 12% so the faster your doing the more the difference will be.

[mocchi]

speedohealer?
black box with yellow sticker? lol. im just guessing.

[zhong]

FYI.

http://www.modifry.com/products/yj/new_yj_.gif

Peace.

[AusS2000]

From Honda it's about $800 for the C&P.

[JAP-S2K]

From Honda it's about $800 for the C&P.

That's reasonable, which dealership is that from?

[OMG.JAI xD]

Hey boys,

Quick question here, what diff oil do you guys recommend using?

[JAP-S2K]

oem oil is fine. If you haven't changed your centre then any good open diff oil is fine as torsen LSD's really aren't sensitive to oil type or viscosity. I've been put onto Motul gear competition 75W140.

[AusS2000]

oem oil is fine. If you haven't changed your centre then any good open diff oil is fine as torsen LSD's really aren't sensitive to oil type or viscosity. I've been put onto Motul gear competition 75W140.

OEM oil is anything but fine.

Honda make a whole range of FWD cars and oils to suit. The S2000 is the only RWD car they made in a quarter of a century. If you got to a Honda dealer and ask them to replace the diff oil with OEM you'll most likely get VTM-4, and a stuffed diff.

The correct lubrication for our diff is 75w90 GL5.

[euromandeluxe]

Sorry Aus, what's wrong with the OEM fluid?

As long as you pick up the proper OEM stuff the manual calls for (API GL5 SAE 90) you should be fine. I picked up a bottle of the stuff from my local honda dealer a couple of days ago.

As far as the dealers not knowing which oil is the proper stuff for the S2000 differential... that's another story.


OEM oil is anything but fine.

Honda make a whole range of FWD cars and oils to suit. The S2000 is the only RWD car they made in a quarter of a century. If you got to a Honda dealer and ask them to replace the diff oil with OEM you'll most likely get VTM-4, and a stuffed diff.

The correct lubrication for our diff is 75w90 GL5.

[AusS2000]

I just mean, if you know what is correct, why would you buy it from Honda. You can get it much cheaper from any auto store.

[euromandeluxe]

I just mean, if you know what is correct, why would you buy it from Honda. You can get it much cheaper from any auto store.

Ah fair enough. I guess noobs like me like to try the OEM stuff for the first change before switching to other brands later.

[pilotb777_300]

The honda rear diff fluid has been up on the shelf of just about every honda dealer I have been to. its called honda Hypoid gear oil... the spec on it is a GL-5 SAE90
The honda dealer I go to, sells it for about 16 bucks for 1L which is all you need. I think thats a very reasonable price actually compared to what is on the market. I have never had an issue with this fluid and funnily enough my diff seems to run the quietest with it. I went through a bit of a phase a few month ago of trying to use all synthetic fluid in my car from engine to diff. I tried everything in the diff from Redline synthetics to motul and mobile 1. For some reason and maybe someone can explain this to me, I seemed to get more whine from the diff using some of the synthetic stuff mobile 1 being the loudest. The mineral honda OEM fluid almost got rid of all noise in the rear diff.

[JAP-S2K]

OEM oil is anything but fine.

Honda make a whole range of FWD cars and oils to suit. The S2000 is the only RWD car they made in a quarter of a century. If you got to a Honda dealer and ask them to replace the diff oil with OEM you'll most likely get VTM-4, and a stuffed diff.

The correct lubrication for our diff is 75w90 GL5.

What's wrong with the factory "S2000" diff oil bought by Honda? i'm curious to know, agree'd that most dealership's are useless. But the genuine oil is fine.

[Clio]

+1 from what I've read on s2ki the oem diff oil is great and its price is reasonable too

[greek_rambos2k]

i got quoted $2500 for a new diff for my s2k from Honda and thats for a refurbished one not brand new

[AusS2000]

My spare diff will be for sale shortly. Having my diff rebuilt and reinforced and once it's ready my current diff will be spare. It is in fine condition and runs nicely.

[trex101]

The honda rear diff fluid has been up on the shelf of just about every honda dealer I have been to. its called honda Hypoid gear oil... the spec on it is a GL-5 SAE90
The honda dealer I go to, sells it for about 16 bucks for 1L which is all you need. I think thats a very reasonable price actually compared to what is on the market. I have never had an issue with this fluid and funnily enough my diff seems to run the quietest with it. I went through a bit of a phase a few month ago of trying to use all synthetic fluid in my car from engine to diff. I tried everything in the diff from Redline synthetics to motul and mobile 1. For some reason and maybe someone can explain this to me, I seemed to get more whine from the diff using some of the synthetic stuff mobile 1 being the loudest. The mineral honda OEM fluid almost got rid of all noise in the rear diff.

If you are using fully Synthetic, Redline Light weight shock proof or Heavy weight shock proof should be the correct fluid. Honda rear diff are too weak and the normal 75w90 GL-5 doesn't provide enough protection under heavy launch. Should choose a heavier weight gear oil for the diff.

http://performancelub.com/Redline/Shockproof.jpg

[tamay_s2k]

i just finished my diff build 2 weeks ago
cost me almost $4000
$500 for new casing
$800 for 4.44 final drive
$1200 for kaaz 1.5way LSD
$300 j's racing crush collar
$220 for bearings
$800 for labour and build including balance and backlash adjustment
the car feels insane now with the kaaz lsd and reacts very differently around corners.
definantly a mod i highly recommend
the oil im using is a 90w-140 full synthetic
very thick but protects the diff like you wouldnt believe. car felt very very harsh on the standard kaaz 'wear in' oil which was i think from memory also a 75w based oil.

[trex101]

i just finished my diff build 2 weeks ago
cost me almost $4000
$500 for new casing
$800 for 4.44 final drive
$1200 for kaaz 1.5way LSD
$300 j's racing crush collar
$220 for bearings
$800 for labour and build including balance and backlash adjustment
the car feels insane now with the kaaz lsd and reacts very differently around corners.
definantly a mod i highly recommend
the oil im using is a 90w-140 full synthetic
very thick but protects the diff like you wouldnt believe. car felt very very harsh on the standard kaaz 'wear in' oil which was i think from memory also a 75w based oil.

Damn, 4k is alot of $..... thicker gear oil is definably the ticket for longer diff life span. look for the number behind the w, 90w140, 140 is the viscosity when it is hot, the number before the w is winter rating, the lower the better.

Next time you change diff oil, try the Redline smurf oil (LWSP 75w140) or the HWSP 75w250, you wouldn't regret it.

[TONTON]

I got a diff from an AP1 good working condition - $500