Evo 6 Rs transfer case/box continued

jimme18 · Dec 5, 2014

Hi

I have been told that the evo 6rs transfer box is different from the 5/6 gsr or any other evo boxes/cases, is this the case? The owner before me blew the same one and said he couldnt get a transfer box/case that fitted unless it was an evo 6rs one.

Is he right or talking ****?

Chheers

super rover · Dec 5, 2014

456 transfer boxes ALL the same casing wise ,the TME had a differant one but there rare and as a complete unit would stil fit
its the LSD inside that CAN be differant but they all work in either 4,5 or 6

big-al · Dec 5, 2014

Yeah a GSR one will fit the same as an RS or TME. The actuall diff inside of the casing is a different story as the Crown wheel has a different internal dia size. Id try and get a helical style lsd box if poss as they are stronger than the GSR one

jimme18 · Dec 5, 2014

Okay so, its the inside that's different.

If its an rs what will in the transfer box most likely? and if its something rare can I not just replace the broken internals with something aftermarket like a ralliart or cusco front diff?

Is it not just possible to remove the transfer box in its entirety and put a standard gsr transfer box in?

Sorry guys this goes well beyond my expertise.

stu8 · Dec 5, 2014

thing is, these cars are getting on a bit now, so the fact they have been around so long, the diff bolts are a weak point, and even new, there was cross over with models on what transfer box was fitted, you arent really going to know whats in the transfer box casing till you open it up (or at least remove it)

4/5/6 transfer boxes are all interchangeable, so you arent short of options, once its off and opened up, pop some pics on here and people will soon tell you what you have and what options you have

yes, GSR and RS boxes are a straight swap, but there is no guarantee whats what from the model of the car

Stu

big-al · Dec 6, 2014

Simply........buy an RS helical type diff. Strip it and change the diff bolts to 10.9 high tensile ones and you cannot go wrong even up to 500+bhp

The cusco and ralliart diffs are very aggressive and drive horribly in reverse or full lock. Plated diffs clunk and bang not really suited for the road

Clivew · Dec 6, 2014

big-al said:
Simply........buy an RS helical type diff. Strip it and change the diff bolts to 10.9 high tensile ones and you cannot go wrong even up to 500+bhp

Not correct.

10.9 are not high tensile, 12.9 are, and even if you change to these, you'll still have a problem with the bolts coming loose as it's due to an inherent design problem.

I've worked with Rally guys who were breaking 12.9 bolts every 90 stage miles running much less then 500. A design change and modification to the casing was the only way to stop it happening.

big-al · Dec 7, 2014

Like a ****8n witch hunt in here

Clivew · Dec 7, 2014

Eh?

What have facts from a great deal of experience got to do with a witch hunt??

So, shall we all just agree with you, even though your comments are incorrect?

Stating "you cannot go wrong" with fitting 12.9's in a 500+ car is BS I'm afraid.

And that helps no-one.

big-al · Dec 7, 2014

Well im talking real world in my real world 505bhp road going E6 with 12.9 bolts in having done 8k miles without a problem. I guess i must just be plain lucky but eh??

Clivew · Dec 7, 2014

Yes, you've been lucky, and are making assumptions from one case, your car.

I see many, many transfer boxes every year and am talking from experience from these cars, road cars, race cars, rally cars, as well as carrying out an in depth analysis of the problem and what causes it.

It is an inherent design problem with the type of bolt fitted, thus why Mitsubishi changed the design from the TME onwards.

Fitting 12.9's does not resolve the issue, fact.

super rover · Dec 7, 2014

i changed my bolts 7 years ago when i bought my car its never been anything else other than a rally car and ive NEVER had an issue what so ever ,there as good today as the day they where fitted and thats on 12.9s

stu8 · Dec 7, 2014

I have a theory on this: Not educated, but just my thoughts

the bolts, standard or uprated are borderline for doing the job they were intended for, hence, there is no rule as to how long they will last. 10.9 or 12.9, yes, 12.9 maybe a wiser choice, but ultimately its just not possible to get them tight enough. But, fitting larger width tyres, bigger wheels, stickier tyres etc all add to the load on these bolts when cornering, and so they become more problematic. Also I suspect that slow speed tight cornering, like a U turn on a tarmac road is what did mine 2 of the times

The likes of super rover with the rally car will be doing a lot of high speed driving on lower grip surfaces will suffer less than a road car in a city environment. On a similar note, the power of the car isnt really a factor either

As I say, only my theory from my experience and thoughts on it

Stu

T0m · Dec 8, 2014

@clivew
is there a way we can solve the weak bolts issue by ourself ?

or can you create a reinforce DIY kit :naughty:

felix2566 · Dec 19, 2018

Not really a DIY job, machining work needs to be carried out to allow the different style bolts to fit.

Evo 6 Rs transfer case/box continued

Our Vendors

Top Contributors this Month

Recommended Communities