Ke20 Diff To Ae86 Conversion

[Coolrollin]

Hi all,

 

I've got a late model AE86 T series Kouki, disc brake rear end that I'm trying to fit into my Ke25, and my engineer is tell me that it can't be done.

 

He said the only way to bring it back to ke20 1320mm width would be shorten one side about 60mm (i.e. left side as diff centre is already 20mm off centre to the right.) which will bring diff centre 40mm to left.

 

My issue with this is that I think I'll have drive shaft clearance issues?

 

What are my best options using this diff. I know I can use other diff combinations, but want to stick with what I've got.

 

I've Googled the heck out of my computer for days trying to find a solution.

 

Cheers.

[parrot]

That's pretty rough. I presume you have done a dummy sit on the springs to see what your clearance is like.

 

My non engineer thinking is you would shorten it evenly each side which would also include the drive shafts obviously. That is going to be expensive. Have you been to talk to a diff service to see how they would approach it? If they have some working relationship with the engineer, possibly they can work out an acceptable solution between them.

 

If it helps in any way, I have a TE27 diff housing and axle set sitting here should you require any measurements.

[Coolrollin]

Thanks Pete, yes that was my understanding too, a bit off each side.

 

The diff housing isn't the problem, its the axles as they fall into the category of not been long enough to shorten and to long to use.

 

Apparently you/they can't just cut the axels and re-spline them. But I thought this is what they did to shorten diff's.

 

The guy I got to do the diff is a diff engineer specialist, Geoff England. so I think he knows what his talking about.

 

Admittedly he manly does ford stuff, not much Toyota's.

 

My new way of thinking is maybe getting custom axles made up?

[parrot]

Crikey, I'm sure you never saw that coming.

[Coolrollin]

Nope.

[oh what a nissan feeling!]

what he is saying is correct, axels stay small just after the spline so can't be resplined until you cut enough off them. the usual process is to put the short axel in the long side and then shorten the long axel a fair bit. because your diff is very close to the length required though this wont work either.

my suggestion would be to use the long axel in the short side and have it splined at the length you require. then source the long axel from an r31 or pintara or something else suitable and have it cut and splined and machined to take your bearing ect to suit your diff.

 

i only suggest r31 or pintara because of stud pattern.

[styler]

You need an evenly split diff from driveshaft flange to drum brake face to suit a xE2x last I looked, that's the tunnel position I believe.

The reason you can't respline the same section is that the splines are rolled onto the axle, so they extend above and below the surface level.

You can't replicate that by cutting. So you need to move up the axle to a bigger step and respline that by cutting into it. The problem is the bigger

step is further up the axle and shortens the axle by too much. The solution is to find a longer axle with a thicker diameter and also which has the

same wheel flange and also a conversion bearing that suits the housing and the axle ID and OD. Happy hunting at the wreckers!

[Coolrollin]

Thanks guys for your input.

There's no long or short side, both axles are the same length and I don't want to shorten one side as I can see more problems arising.

Yes you are both right with shortening axles as they need to be cut before the step down to the spline.

And yes styler you maybe right looking for longer axles. but the problem with that is late model Kouki T series diff wheel bearings are huge and the axle hub flange width.

 

I'm currently thinking of shortening the diff and axles to the minimum required and then spacing between the brake disc and axle hub. To hide the spacer as I know there illegal for road cars.

[oh what a nissan feeling!]

if you do that rather than run spacers just get some wheels sorted that have epic dish and minimum backspacing. win win.

 

personally i would be shortening it more than factory length anyway to get some better dish on the rear wheels, but i guess that depends what look you are going for. on my ke30 the new diff is 40mm shorter per side.

Edited April 23, 2016 by oh what a nissan feeling!

[Coolrollin]

Yeah that's the look I'm after. Already running 13x8 -15 deep dish wheels with Trueno metal flares, which I'm trying to keep both. Better to run negative offset than positive in my books. But need to be careful not to hit leaf spring and inner hub.

[styler]

Be careful, you might need the factory diff width for engineering I believe, check the ncop and talk to an mod plate engineer.

They don't like wheel spacers but a set of hub centric bolt on ones might pass, you will have to check. Another option is to sell that diff

to the AE86 crowd and get a zenki T series with drums, a lot cheaper for the diff and easier to convert.

[Coolrollin]

Thanks Styler, yeah I'll get Geoff to check out my TA22 diff and see if that's easier, just need to source a LSD centre and try to convert it to disc brake. But think I might have the same problem with the axles.

[Coolrollin]

And they said it couldn't be Done. T series Kouki LSD, disc brakes diff in my Ke25. After very deep pockets & 4 months of F'n around all nearly done, just need to mount pan-arm bar and tail shaft.

[KEI069]

Only just seen this thread and don't know why they said it can't be done.

I run the same diff with l.s.d But drum brake setup, shortened to suit my KE10.

The work was done about ten years ago. I remember

The diff place having dramas cutting the splines cos it wasn't a common spline count

Can't for the life of me remember what axles were used though!

 

Glad you got it sorted, I reckon keeping the Toyota diff is the right choice, it just looks

Correct installed

[Coolrollin]

Thanks KE1069, yeah I agree trying to keep the same maker. Not much of a fan with putting Datsun shit in Toyota's, if I can avoid it.

The main issue with this diff conversion was the Axles. that's why they said it couldn't be done.

I'd be appreciative if you can find out for me, what axles you used.

Cheers.