EVO 1,2,3 rear diff's?

[zen4G63]

looking into a change in rear diff what is the difference in the EVO 1,2,3 rear diff.
will they bolt into a VR4 E39A?
might have different diff ratio's?
want to pull 4ws out and thinking about the diff what to do or what to use.
are they all 4 bolt diffs the EVO ones?
thanks

 

[brisvr4]

Talk to Bazeng about this, he's done it.
The Evo 1-3 diff centre will fit into a 3 or 4 bolt diff housing. All you really need to use is your ring and pinion if you want to stay 3.545.
You need to use the Evo stub axles (tulips) and mate them with 4 bolt outer axles.
Apparently you can use 3 bolt outer axles but you need to use the larger cv bearing setup from a 4 bolt. Doing it that way would still leave you with the weaker 3 bolt axles though.

 

[VR-4Squid]

Apparently you can use 3 bolt outer axles but you need to use the larger cv bearing setup from a 4 bolt. Doing it that way would still leave you with the weaker 3 bolt axles though.

Nah, the 3bolt axles break where the splines go into the diff, and your replacing that part with the evo cv cup.

 

[brisvr4]

Nah, the 3bolt axles break where the splines go into the diff, and your replacing that part with the evo cv cup.

So I could use my 3 bolt axles with the Evo tulips and they should live?
Even with Antilag launches?

 

[EVO-00X]

All EVO 1-3 had a 3.909 rear diff ratio. Also, the EVO 1-3 RS/GSR models all had mechanical LSD rear centres, EXCEPT the EVO 1 GSR which had a viscous LSD centre (which you will need the rear axles for it).

1. The EVO 0 VR4 had a rear 3.909 LSD if you can find one.
2. Swapping over the guts of an EVO 1-3 rear mech LSD into a E39A rear diff housing can be done and you can still keep your existing VR4 axles. However, before doing so you will need to use your VR4 (or GSR) 3.545 rear crown wheel and pinion from your existing diff with the EVO mech LSD diff centre before chucking it all back into the VR4 diff housing. This will ensure you will have a 3.545 ear diff ratio so no need to change your VR4 gearbox or transfer case.
3. The changing over of the crown wheel and pinion should be done by a professional as the backlash and tooth contact pattern needs to be setup spot on. Get it wrong and you're screwed.

 

[Liberoz]

the EVO 1-3 RS/GSR models all had mechanical LSD rear centres, EXCEPT the EVO 1 GSR which had a viscous LSD centre (which you will need the rear axles for it).

Rob where the hell did you get this miss-info from :thumbsdown:

4TheRecord: mechanical lsd centres were an option on all gsr's and even RS's also included with this option from factory were Libero GT's with mechanical as an option.

 

[brisvr4]

A


2. Swapping over the guts of an EVO 1-3 rear mech LSD into a E39A rear diff housing can be done and you can still keep your existing VR4 axles.

You still need to use the evo stub axles ( inner axle ) as the diameter is larger than a VR4 3 bolt stub section.
You can use the outer section though and mate it to the Evo inner.
I hope that made a bit of sense

 

[DOUGMO]

Rob where the hell did you get this miss-info from :thumbsdown:

4TheRecord: mechanical lsd centres were an option on all gsr's and even RS's also included with this option from factory were Libero GT's with mechanical as an option.

i find it hard to believe that all evos had to have the box ticked for a mech rear diff. i have seen far more mech lsds than open and/or viscous put together.

 

[EVO-00X]

Aaahhh boys, you will have to refer back to your source of information for EVO I-III's over the years. The viscous LSD rear diff was NOT an option on the EVO I-III... its a load of bullshit. A Viscous rear LSD only came out on the EVO 1 GSR model.

These following models simply came out with a mechanical (clutch type) rear LSD centre as standard:
EVO 1 RS
EVO II RS/GSR
EVO III RS/GSR

Only the FRONT LSD was an option on either the RS or GSR spec EVO's.

If you have been misled over the years into believing there was an option for viscous or mech rear LSD diffs from factory then you have been misinformed. If you come across a genuine EVO 1 RS or EVO II/III RS/GSR with a viscous LSD rear end in it then the rear diff has been swapped out at some time.

This is common knowledge in NZ by people who work on EVO's for a living. Look up and read the UK EVO buyers guide and you will also find this out. Look up CAPS and you will see there is only one part number for CE9A rear diffs. Look in the EVO III pdf parts listing and you will only see mention of the mechanical plate type rear LSD.

 

[DOUGMO]

agreed rob

 

[BMGTZ]

rob that was my understanding too.

 

[Liberoz]

funny that after 15 odd years working on evo's 90% have had viscous units not mechanical lsd

 

[VR-4Squid]

Aaahhh boys, you will have to refer back to your source of information for EVO I-III's over the years. The viscous LSD rear diff was NOT an option on the EVO I-III... its a load of bullshit. A Viscous rear LSD only came out on the EVO 1 GSR model.

These following models simply came out with a mechanical (clutch type) rear LSD centre as standard:
EVO 1 RS
EVO II RS/GSR
EVO III RS/GSR

Only the FRONT LSD was an option on either the RS or GSR spec EVO's.

If you have been misled over the years into believing there was an option for viscous or mech rear LSD diffs from factory then you have been misinformed. If you come across a genuine EVO 1 RS or EVO II/III RS/GSR with a viscous LSD rear end in it then the rear diff has been swapped out at some time.

This is common knowledge in NZ by people who work on EVO's for a living. Look up and read the UK EVO buyers guide and you will also find this out. Look up CAPS and you will see there is only one part number for CE9A rear diffs. Look in the EVO III pdf parts listing and you will only see mention of the mechanical plate type rear LSD.

QFT

perhaps someones confused by all the gsr's with 4G63's and evo kits getting around the place.

 

[EVO-00X]

Squid, I had to search the net to find out that 'QFT' meant "Quoted For Truth" lol :lol:

 

[runuts]

From all mitsi documentation as well as cars I've worked on, all evo 2/3's had mechanical rear diffs, and e1's had viscous. I find it hard to believe that every one I've worked on, had an optional rear diff.

 

[DOUGMO]

you wouldnt see any though todd as liberoz is working on all of the cars with viscous rear diffs.

 

[mrcyborg]

i have worked at a jap wrecker for a while now. have decent amount of evo diffs to, probably over ten left at the moment. all cd9a diffs are viscous besides one which is mechanical(quite possible a rs) all ce9a diffs are mech lsd. have only found one so far which is not a factory fitment.

 

[EVO-00X]

Yep thats understandable and a reasonable explanation lays within the availablity ex Japan. There will be more CD9A EVO 1 GSR rear diffs and parts getting imported than CD9A EVO 1 RS parts because the EVO 1 RS wrecks and parts get snapped up ex Japan by other countries first, or for competition duties for top dollar that our importers cannot compete with. Reason: The EVO 1 RS is lighter than the GSR model and saves stripping down, has the mech rear LSD, and has slightly different and highly sorted gearbox ratios than the other EVO's.

Thats probably why most the CD9A rear diffs you have at your work would be viscous as they're not a popular upgrade and not as highly sort after compared to the mech LSD as far as EVO's are concerned. That and Australia usually gets the cheap left overs after the UK and US vultures have already swept in and grabbed the all good bits lol :w00t: Dont get me wrong, these (complete) viscous LSD rear diff's can be considered an upgrade to an Aussie open rear diff GSR and thats probably why importers grab them at cheap prices - i.e. there's a market for GSR's over here.

 

[mrcyborg]

yes all true, but there is a bigger picture when buying cars in japan, we dont buy them just for diff, or boxes or running gear, it is the whole car, so while people will pay bigger dollar for the RS specs becuase or rally and race reasons. we buy GSR versions and high specs where we can, becuase its a better $ value for the extra electrics and gear we can sell. simple things line window regs and climate controls fetch much more money being electric rather than manual.

 

[EVOCPE]

Yes... reason why i bought my CD9A cut... mostly coz it had all the electrics oh and a bonus when i found that the box had LSD