Toyota Diff Size Questions

[Toyo Truck]

Hi Guys,
I just have a question regarding the hilux diff centres.
now I have heard that they are a G-series diff centre,
which is listed most places as an 8" centre.
All other vehicle info refers to the G-series as being an 8" too.

For example...
I have an MX83 cressida with a G-series diff and apparently these are 8" also?
MX83 Cressida AXLE CODE = A340E G312
A340E = Gearbox?
G = 8" Ring Gear
31 = 3.909 Ratio
2 = 2 Pinion, No LSD.
http://www.geocities.com/MotorCity/Pit/ ... Codes.html <http://www.geocities.com/MotorCity/Pit/ ... Codes.html>

But then I remembered, Isn't the rear hilux G-series got a larger 8.5" or something Centre?
I fitted ARB air lockers to the front and rear of my gen3 hilux
about 2 years ago and the front centre was visually smaller than the rear.
They had different part numbers.
I remember something about the ARB guy saying my model have the
smaller 8" centre in the front diff?
Is there any differences in the front and rear diff setups on hiluxs??
Are there 2 types of G-series? Or is the rear diff in the hiluxs a different series to the one in front?

I checked the ARB website for air-locker applications, and it says there are 2 types of 8" centre for toyota
I presume the 8.9" is the cruiser centre?
http://www.arb.com.au/alac/alsp/0-00.pdf

Is it that the rear diff runs a 50mm carrier bearing and the front runs a 45mm??


Cheers,
Bart

[Mr DJ]

Think you will find the front is 7.5" and the rear is 8".

Well .... mine is anyway

[Toyo Truck]

I thought the IFS models had the 7.5" front?
(It says this on the ARB catalogue)
Don't the solid axles have a bigger front centre
than IFS?

That said, why does the ARB catalogue show
the 7.5" diff for IFS = RD90
an 8" diff for IFS with a 50mm carrier = RD92?
an 8" diff for IFS with a 53mm carrier = RD111?

I presume the two 8" versions must be for the REAR of an IFS hilux?
Perhaps a US model or something??

Any help would be appreciated...

Cheers,
Bart

[boxer]

I got an 89 hilux and im puttin 4.88 ratios in a hilux diff center i got from the wreckers then putting that in the rear. Then with the rear center i've taken out im putting 4.88s in that, then putting it into the front being told this wolud be all good. are you saying this wolud not fit in the front?

[spazbot]

the differance in hilux diffs front to rear is the bearing size, hence the rd01 and rd23 lockers, i think the rear has a 50mm carrier bearing and the front has a 43mm bearing, both diffs are the same size and interchangable just diff bearing sizes, so any 8" hilux diff should fit into your cressida, im not sure on what the go wioth axle splines is but i assume they are the same.

ps the measurments are off the top of my head

[Gribble]

Chill out boxxer, the front and rear diffs in NON-IFS Luxs are the same. So you should not have any dramas. Only the IFS jobbies have 7.5 inch gears.

[boxer]

Chill out boxxer, the front and rear diffs in NON-IFS Luxs are the same. So you should not have any dramas. Only the IFS jobbies have 7.5 inch gears.

Thanks for that Gribble I was shitting myself thinking I just blew my cash !

[Gribble]

Chill out boxxer, the front and rear diffs in NON-IFS Luxs are the same. So you should not have any dramas. Only the IFS jobbies have 7.5 inch gears.

Thanks for that Gribble I was shitting myself thinking I just blew my cash !

Nah, 4.88s is good spending.

[Toyo Truck]

Sweet,
What is the benefit of the 50mm bearing over the 43mm?
Is the 50mm stronger cause its bigger??
Can you run the 50mm bearing diff in the front housing??
Or will it only fit in the front housing with the 43mm bearing??

Why do ARB list an 8" diff with 53mm carrier bearings?
What diff uses these?? Wouldnt these be stronger again??

Spaz,
What size bearing would the cressida diffs and other non 4wd
g-series diffs be? would they run a 50mm or 43mm carrier bearing?
Or would I just bolt my carrier bearings I have on the cressida
diff now and bolt them onto the LSD centre??

Cheers,
Bart

[dumbdunce]

Sweet,
What is the benefit of the 50mm bearing over the 43mm?
Is the 50mm stronger cause its bigger??
Can you run the 50mm bearing diff in the front housing??
Or will it only fit in the front housing with the 43mm bearing??

Why do ARB list an 8" diff with 53mm carrier bearings?
What diff uses these?? Wouldnt these be stronger again??

Spaz,
What size bearing would the cressida diffs and other non 4wd
g-series diffs be? would they run a 50mm or 43mm carrier bearing?
Or would I just bolt my carrier bearings I have on the cressida
diff now and bolt them onto the LSD centre??

Cheers,
Bart

the two bearing sizes for hilux diff spigots are 50mm ID and 45.24mm ID. RD01 is 45.24mm and RD23 is 50.00mm. RD01 is discontinued as 50mmID/80mm OD bearings are redily available (eg 80 series rear diff carrier). RD23 will fit front and back of any non IFS hilux

the letter designation of toyota diffs refers ONLY to the diameter of the ring gear and there is a whole world of variation beyond that - if the cressida is an IRS diff there is every possibility that none of the bits are any good for a lux diff. pull them both apart and try it.

[Toyo Truck]

Thats what I was worried someone was gonna say.
Is there any other placards or documentation with the vehicle
which might tell me more information like the Axle code did?

Just for my knowledge,
Are there any benefits other than availability on the 50mm ID bearings?
And I'm still curious about the 53mm listing for an 8" diff???
What luxie has these fitted??

Cheers,
Bart

[dumbdunce]

Thats what I was worried someone was gonna say.
Is there any other placards or documentation with the vehicle
which might tell me more information like the Axle code did?

Just for my knowledge,
Are there any benefits other than availability on the 50mm ID bearings?
And I'm still curious about the 53mm listing for an 8" diff???
What luxie has these fitted??

Cheers,
Bart

not really, the code only gives you diameter, ratio and spider/limited slip info. the only way to get more info is google, find someone else who has already pulled it apart, or pull it apart yourself.

50 and 45.23mm bearings both equally available, 50mm obviously stronger. the 53mm ID bearing is ONLY in the 2003-on IFS lux front diff - it does not exist in any live axle front or rear. not sure on the OD of this one but it is *probably* 83.00mm like a prado 8" rear diff carrier bearing, (which has 50.00mm ID).

cheers

Brian

[Toyo Truck]

thanks Brian,

You are the man when it comes to Toyota stuff!
I have heard off a few people that the g-series from a hilux
works in a cressida housing, but as you say, I won't know till it is
out of the car completely

What would it cost me roughly to get the centres swapped at a
shop? Could I do it myself??
I am fairly mechanically minded person, and have changed alot of CVs
and uni-joints and stuff, just never a diff centre.


Cheers,
Bart

[dumbdunce]

thanks Brian,

You are the man when it comes to Toyota stuff!
I have heard off a few people that the g-series from a hilux
works in a cressida housing, but as you say, I won't know till it is
out of the car completely

What would it cost me roughly to get the centres swapped at a
shop? Could I do it myself??
I am fairly mechanically minded person, and have changed alot of CVs
and uni-joints and stuff, just never a diff centre.


Cheers,
Bart

it isn't difficult but you need some special tools (low range torque wrench or spring scale, dial gauge, pin wrench, press) and it is time consuming, and you are likely to need a shim set if moving gears from one housing to another. to have gears swapped by a shop should be around $200.

[Toyo Truck]

Thanks again Brian,

I have never rebuilt a diff, and don't have those tools you listed,
I would like to learn how to do this one day, but have never had the
opportunity.

How hard is it to get the centre out of the housing??
Would it be cheaper if I take the centre out and take that with the luxie LSD to the shop and say swap these please, then Once I get the gears and everything swapped over, I'll put the shimmed up LSD centre back into the cressida?
Or should I just get them to remove it, change it and refit it all at the
same place?

Cheers,
Bart

[dumbdunce]

Thanks again Brian,

I have never rebuilt a diff, and don't have those tools you listed,
I would like to learn how to do this one day, but have never had the
opportunity.

How hard is it to get the centre out of the housing??
Would it be cheaper if I take the centre out and take that with the luxie LSD to the shop and say swap these please, then Once I get the gears and everything swapped over, I'll put the shimmed up LSD centre back into the cressida?
Or should I just get them to remove it, change it and refit it all at the
same place?

Cheers,
Bart

pulling them apart is easy. just pull them apart and take the bits you want put together to someone who knnows what they're doing.

what exactly are you trying to achieve? LSD into cressida? WHY??

[Toyo Truck]

I am gonna put a 1JZ-GTE in there and the single spinner has
trouble putting 145KW to the ground, imagine 230-odd!
My mate has just done this conversion and now we are gonna do
the same to mine. But I have a few other ideas on how its gonna go.

I'm obviously swapping the LSD centre in,
I will lower it 2" and throw some good/new shocks in it,
bigger sway bars and ford ventilated rotors and skyline R32 calipers up
front to help slow the thing down (currently a problem with my mates car).

I originally got the idea of a bloke in St.Marys who had a wicked 12.5 sec
quarter 1JZ MX83. These things have loads of potential and they are the
ultimate sleeper.

Cheers,
Bart

[Gribble]

I am gonna put a 1JZ-GTE in there and the single spinner has
trouble putting 145KW to the ground, imagine 230-odd!
My mate has just done this conversion and now we are gonna do
the same to mine. But I have a few other ideas on how its gonna go.

I'm obviously swapping the LSD centre in,
I will lower it 2" and throw some good/new shocks in it,
bigger sway bars and ford ventilated rotors and skyline R32 calipers up
front to help slow the thing down (currently a problem with my mates car).

I originally got the idea of a bloke in St.Marys who had a wicked 12.5 sec
quarter 1JZ MX83. These things have loads of potential and they are the
ultimate sleeper.

Cheers,
Bart

Im pretty sure the hilux LSD centre has 30 splines and the cressida axles have less than that.

Besides that i cannot see there being much of an advantage running a hilux lsd, i kinda agree with dunce on this one.

I suppose if you can get it in there for cheap it will be somewhat better than an open centre.

[Toyo Truck]

It'll be heaps better,
Especially if I get it shimmed up,
it will slide even better than it does now!

I've owned 2 mx83 cressidas now,
Trust me, drive an mx83 glxi (no LSD) into a corner,
then try it with the grande (with LSD) and you will feel how
much better it is.

Cheers,
Bart

[Gribble]

It'll be heaps better,
Especially if I get it shimmed up,
it will slide even better than it does now!

I've owned 2 mx83 cressidas now,
Trust me, drive an mx83 glxi (no LSD) into a corner,
then try it with the grande (with LSD) and you will feel how
much better it is.

Cheers,
Bart

Screw shimming it, weld it.

[Toyo Truck]

Was gonna do this hey.
Seeing as I got the single spinner now,
but everyone tells me I will definately break axles being IRS and all.
So I gotsta shim, or go lockrite if I want to be sensible about it

[dumbdunce]

It'll be heaps better,
Especially if I get it shimmed up,
it will slide even better than it does now!

I've owned 2 mx83 cressidas now,
Trust me, drive an mx83 glxi (no LSD) into a corner,
then try it with the grande (with LSD) and you will feel how
much better it is.

Cheers,
Bart

Screw shimming it, weld it.

x2

shimming lasts 5000km, welding is forever

[dumbdunce]

Was gonna do this hey.
Seeing as I got the single spinner now,
but everyone tells me I will definately break axles being IRS and all.
So I gotsta shim, or go lockrite if I want to be sensible about it

lockright + lots of power = broken everything. they are very gay for big torque applications.


spool it. I've welded plenty of IRS rears - datsun 1600/200B (same diff), and skyline R180's, the weakest link in both is the ring and pinion, and they are near bulletproof.

[spazbot]

what about a airlocker

[Gribble]

what about a airlocker

Hmm, boring mode and drift mode, i like it.

[Toyo Truck]

DD,
I wanted to weld it, but everyone keeps telling me "ohhhh you'll break
axles soooo easy cause of IRS" and all that. So you reckon it'll be OK?

How hard is it to weld up a G-series single spinner?
How do they drive once welded up...sideways I guess.
Is it really aggressive and hard to drive at all speeds or only if you
pin it?

Can you drive "normally" or is it all or nothing? Which I wouldnt mind
too much I guess

Spaz and Gribs,
Would have put in an air-locker, but too pricey for a little bit of sideways fun. Detroit was the next option, but I thought I could get away with the
hilux LSD centre to save dosh.

Cheers,
Bart

[Gribble]

DD,
I wanted to weld it, but everyone keeps telling me "ohhhh you'll break
axles soooo easy cause of IRS" and all that. So you reckon it'll be OK?

How hard is it to weld up a G-series single spinner?
How do they drive once welded up...sideways I guess.
Is it really aggressive and hard to drive at all speeds or only if you
pin it?

Can you drive "normally" or is it all or nothing? Which I wouldnt mind
too much I guess

Spaz and Gribs,
Would have put in an air-locker, but too pricey for a little bit of sideways fun. Detroit was the next option, but I thought I could get away with the
hilux LSD centre to save dosh.

Cheers,
Bart

It will be easier to break them, but it mostly comes down to how much abuse your going to give the rear end. My old torana had a welded centre in it. I went through about 6 axles, but thats coz i was 17 at the time and did more burnouts than ive had hot dinners.

Welded centres can be somewhat unpredicable at first, they can either send you ploughing (understeer) or send you sideways (oversteer). This is purely because there is not "differential" action happening. The only real traction advantage you have with one is in a straight line.

They can be dangerous in the wet but if your pretty good at countersteer and throttle control it can be kept to a minimum. You just got to get used to it and know when its about to kick out or send you into the magnet-trees.

[Toyo Truck]

Gribble,

Mate is it possible that if I only spun it through corners
every now and then but mostly drove it fairly
gently, would it be OK?

Can you drive a welded diff sedately?
IE if I had my mum or GF in the car, could I drive it without
them really noticing? OR does it ALWAYS slide just to
varying degrees dependant on throttle application ??

Cheers,
Bart

[Gribble]

Gribble,

Mate is it possible that if I only spun it through corners
every now and then but mostly drove it fairly
gently, would it be OK?

Can you drive a welded diff sedately?
IE if I had my mum or GF in the car, could I drive it without
them really noticing? OR does it ALWAYS slide just to
varying degrees dependant on throttle application ??

Cheers,
Bart

Yeh should be ok, just do it, weld it.

[My Lil Lux]

Spool it, see heaps on ebay, there not expensive.