samuel

Hello,

I need to replace the rear diff on my STi V4 Type R and need to know if it is possible to just change the internal components? I would also like to lower the final drive from 4.4 (i think) to 3.9, i understand that Prodrive carried out this mod (amongst others) to the Jap spec 22b's to change them to UK spec.As 22B's used the same gearbox and rear diff(correct me if i am wrong) as V4 Type R's it therfore may be possible.

Any information would be greatly appreciated.

Cheers

Sam

MorayMackenzie

You would have to change the final drive in the gearbox as well as the diff, so it could be expensive...

MorayMackenzie

Oh, and you could take advantage of the situation and replace the aggressive type R clutch diff with a more road-car friendly unit, such as the Quaife ATB, which will probably cost less than the STI item to.

The diff unit can be removed from the crownwheel and replaced by competent gearbox specialist, such as GearTech.

MorayMackenzie

No probs.

samuel

Thank you for your help and i understand what u r saying about changing the gearbox drive as well and yes it could get very expensive. It would reduce it's awesome
acceleration slightly anyway in a trade of for marginally better fuel economy i suppose, but with the price of SUL rising it could pay for itself as a future project.

I shall look into the Quaife Diff. option and let you know how i get on.

Thanks again.

Sam

Clarey

Just a quick question, how do you know you need to change the rear diff? Do they go completely? or are their symptoms of it being on its way out?

Thanks
Phil.
Version 3 TypeR with 137,000Km's under her belt

samuel

Hello Phil,

Noticed a slight clunk when taking up drive from standstill or walking pace and had it checked out at a specialist garage and while up on the ramps we noticed that if you turn the rear wheels back and forth a clunking could be heard coming from the rear diff.

Initial thoughts were for adjustment of the backlash spacers however Type R diffs do not have this adjustment so a replacement diff is required.

Sam

MorayMackenzie

Could this clunk not simply be the normal operation of the clutch type Type R diff? Has the garage tried this rotate the rear wheels test on another Type R before, or is this the only one they have looked at? Just sounds like the sort of noise that may be normal for this type of diff if it's operated in the way you mentioned.

samuel

Hello,

Well the garage was Scoobysport but this obviously doesn't mean that they will have checked another Type R before.


Are there any other Type R owners with similar noises from the rear diff?

MorayMackenzie

It was just a thought...

mutant_matt

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:<HR>Originally posted by samuel:
<B>Well the garage was Scoobysport but this obviously doesn't mean that they will have checked another Type R before. [/quote]

Well Pete does have his own RA (unless it's actually been sold yet..) so you'd expect him to know.....

Matt.

samuel

Sorry didn't know he had his own and pretty sure Scoobysport has worked on more than it's fair share of Type R's, just got a bit carried away with the thought of not having to replace the diff.

Sam

MorayMackenzie

Samuel,

Don't loose hope!

There could be a fairly good chance to avoid having to replace the diff... I'll contact you offline shortly, when I've confirmed something.

Moray

kevinburn

I have a 98R sti4 type R. When caning its ****, ie changing up through the gears quick there is a pretty loud clunk from the rear in every gear, just sounds like the diff taking up the slack, i would'nt say it sounded unhealthy.
i will only panic if the gearbox decides to pack in and needs replacing.

:d

happy motoring !! kev

ACA

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:<HR>Originally posted by kevinburn:
<B>I have a 98R sti4 type R. When caning its ****, ie changing up through the gears quick there is a pretty loud clunk from the rear in every gear, just sounds like the diff taking up the slack, i would'nt say it sounded unhealthy.
i will only panic if the gearbox decides to pack in and needs replacing.

:d

happy motoring !! kev

[/quote]

Mine does EXACTLY the same thing. I would be interested to hear more about a softer rear diff though, time to trawl the archives!

Adam M

Mine doesnt make any of these noises at all.

Just to check is tehre no way the noise could be coming from the centre diff. Just wondered if you had all been accelerating hard with the diff lock latched a touch forward.

Aside from this, a softer rear diff sounds like a great idea to me.

Would consider a nice progressive quaife front and rear, but dont want to be the first to do it.

Any takers?

MorayMackenzie

Adam,

Well, I've done the front, so you can do that safely... I suspect it makes more difference than the rear one would... but I also suspect the rear would make an improvement on your fat arsed pimpmobile, sorry, 22b.

Moray

Adam M

At least my car has an engine that runs

[This message has been edited by Adam M (edited 11 April 2001).]

American Jeff

If you are looking to get rid of a clutch type diff email me, and I might buy it from you. I dont know if they are swapable, but I have a VC type rear diff, and it is much softer than the clutch type. What to trade?

uxg

I have also recently purchased a Type R and also noticed the bump from the rear when accelerating hard and doing quick power shifts (i.e. slamming in the gears and using minimum clutch travel). This also had me very worried at first but have found that with a slight adjustment to the way you use your clutch (just need to hold it in for a fraction longer before disengaging and applying power) and being slightly softer with the gear change you can elimanate the bump and get much smoother accelaration to boot.

I have spoken to a friend of mine who owns a Celica GT4 and he has reported the same problem which suggests to me it might be a characteristic of the diffs used in some 4WD cars. Then again I may just be talking b*****k as I am not too sharp on mechanical matters. Either way I would like to know the answer to whether this is normal or not. Any knowledgeble bods out there now about this one?

Rocket

I had a similar problem with my 22b recently - on and off the power at any speed caused a clunk/click in the rear diff area. This even happened when reversing out of the garage at very slow speeds.

To cut a long story short (but I did not remove the diff) a conversation with a friend who has a Type R revealed he had had a similar problem. His was caused by the nearside rear hub locking nut backing off less than 1/8". Checked mine and it had also backed off, you could see how the original pink paint they use to mark them had moved about 1/16". Once tightned up again the noise completely dissapeard.

Off course this may not be the problem you have but for the time it takes you to check it could save a lot of money

Ron


[Edited by Rocket - 7/16/2002 7:12:12 PM]

5 Type R

My STI5 Type R has exactly the same cluncking on take up.

ChristianR

iTrader: (1)

i can get you a 3.9 r180 diff - drop me an email.

MorayMackenzie

Adam,

"At least my car has an engine that runs"
I beg to differ!

Moray

Dave R

Mine does it too, but felt like worn/loose gearbox cross member bushes, but could be wrong...

Only done 28000 so not too worried.

Cheers
Daver

johnfelstead

all you guys wanting soft rear diffs are puffs, whats up with you lot, these are proper cars that need driving!

uxg

I don't want a softer rear diff. Just want to know if the clunk on upchange is a problem or wether it is supposed to do that becuase of the way it works. If it is ok I am more than happy with my diff :-)

Adam M

It is not supposed to happen, no question.

I have been in enough type rs to know it doesnt happen.

Only clunk I get is on tight locks with the diff not in the full back position.

I think the suggestion posted by rocket earlier in this thread is worth looking into.


John, fyi, I have decided to leave the centre diff as is and learn to drive it as it should be driven. but saying that, I dont know if I will be able to drive it regardless of diff due to some of the mods.

johnfelstead

we are talking about the rear diff here adam, not the centre diff. It is normal to get clunking from the centre diff when you have it in the orange indicator band, thats why its coloured orange, to warn you that you may get some transmition shudder on slow manouveurs. Read my post in the centre diff thread from yesterday, it has a full translation of the DCCD, better than the one in the translated manuals.

Adam M

lol,

I was being thick. thinking about the centre diff as I typed about the rear one.

I suppose I could ahve said, the only clicking I get from the transmission is from the centre diff when on high lock.

I still think the suggestion about the rear hubs is a good one though.