Drive Train Gearing Bible

[McSumWay]

A properly fitted ARB locker wont have o ring leaks and you wont rip out an airline on the front diff as it is very protected

[rodw]

A properly fitted ARB locker wont have o ring leaks and you wont rip out an airline on the front diff as it is very protected

X2 I hope . Because I have the air tank in the rear, they ran the front air line through the chassis rail to the front diff and it is very well protected naturally. On the rear diff, I got the heavy duty airline kit on the rear (not required on the front) which is heavy and similar to hydraulic hose. ARB use a 5mm diameter air line which is impossible to find elsewhere but I bought a length of it for $12 from ARB. They also sell joiners for $18 each. Might be worth while grabbing these bits as spare parts to toss in the glove box. If you have a front mounted compressor, you'll have plenty of spare airline so you could save $12.

Oh and Bull, the air pressure for lockers has to be between 85-105 PSI so if you ave an ar tank to go with your endless air system, you will need a regulator for the lockers (see my buildup). It was nice to drive all day and only hear the compressor once!

[Shortyzz]

Hey guys ive been trying to get my head around this, so just to clarify a couple of things

I have a 2006 Diesel Manual running 285/75/16, what would be the best option. 4.1 gear set with a prado front carrier, just tossing up options and to get prices and whether to to get them both locked at the same time??

Cheers
Wade

[Hilux Max]

If your gonna get them locked get a front air locker for a prado 120 when you do the 4.1 gear change.

otherwise you'll be removing the front crown gear twice.....

[rodw]

Hey guys ive been trying to get my head around this, so just to clarify a couple of things

I have a 2006 Diesel Manual running 285/75/16, what would be the best option. 4.1 gear set with a prado front carrier, just tossing up options and to get prices and whether to to get them both locked at the same time??

Cheers
Wade

Yup. 4.1 is the best match for 33" tyres on the Diesel Manual.

I agree with Max, it makes sense to add the lockers at the same time otherwise you will pay twice for the job. You could consider just doing the front locker as it is the hardest to disassemble and add the rear locker later on as it is not that big a job to pull the rear diff.

[amitch888]

Hey fella's, Im also looking at throwing 33's on in the coming weeks and playin around with the ratio's, 4.1 is what I hope to be putting in. Just checking the only way to do this is by using toyota parts? So far no luck with the wreckers so im heading in today to find out prices on new stuff off toyota.

Mitch

[Hilux Max]

If your after genuine 4.1 ratio out of a Prado 120 then for the front you'll need part number - 4120180196, Only 1 in the country in Townsville......expect to pay 900 odd dollars for that and for the rear you'll need part number - 4120180179, theres quite a few of them in the country so no problems there. expect to pay the same amount....

Dont forget for the front you'll need a new carrier....about 300 odd bucks for that. so your totalling around 2100 bux without a front locker......and without labour....very expensive....which is why people look for second hand ones.

I see by looking at your shed that your hilux is a manual.....V6 or D4D?

If V6, then your running 3.5:1 ratio so changing to 3.9 prado diffs might be easier and cheaper as they are more readily available then the 4.1's...the 4.1's they only used for a period of about 2 years .

Also, the rear Hilux diffs use the same crown and pinion gears as all the older live axled and IFS hilux's so you may find it easier to find a second hand set for the rear.

hope that helps.

[Steve9R]

are you saying the ratios in the diffs are different between the diesel and auto's max ?

I didnt realise that..

[amitch888]

max my hilux is a diesel manual, does this make much difference weather its petrol or diesel? arent the ratios 3.5 in everything except the diesel auto?

For both 3.9 or 4.1 in front and rear they told me it was roughly $1000 for each of them but they would do them for $850, I told them I would go home and maybe alter my plans somehow. I wouldnt be buying the carrier as I plan to get lockers front and rear, I was always going to get the rear first but this may change my plans a little.

I have a few ideas running around in my mind at the moment. If I put off doing my ratio's for a while and get lockers, since it is an RD132 ( I think) that goes with all these ratio's for the rear, is there any reason I cant fit a locker in the rear to my standard ratio and fit my 3.9 or 4.1 ratio's later on and maybe do the front locker then? And is there anyway of making the standard hilux front arb locker fit the new ratio's? Hope that makes sense......

[rodw]

are you saying the ratios in the diffs are different between the diesel and auto's max ?

I didnt realise that..

Yep, McSumWay uses 3.9 diffs on his manual and I went for 4.1's on my auto and the final drive is the same with both of us running 265/75 80 R16

max my hilux is a diesel manual, does this make much difference weather its petrol or diesel? arent the ratios 3.5 in everything except the diesel auto?

The auto has a 3.7 Diff. 3.9 is probably a better fit for your manual unless you go big tyres. YOu should at least try and add the front ARB locker when you do this as that takes the place of the Prado Carrier. The ARB manual tells you what part number for the front locker to order based on the dif ratio you are fitting.

[amitch888]

I have a few ideas running around in my mind at the moment. If I put off doing my ratio's for a while and get lockers, since it is an RD132 ( I think) that goes with all these ratio's for the rear, is there any reason I cant fit a locker in the rear to my standard ratio and fit my 3.9 or 4.1 ratio's later on and maybe do the front locker then? And is there anyway of making the standard hilux front arb locker fit the new ratio's? ......

Will that work?

Just trying to decide which way to go about things, it all costs money and my money tree out the back doesnt grow very well

[McSumWay]

If you fit just the rear locker you can go back and change the ratio. It is the front that changes when going over 3.7 gearing. It just means you are paying twice for the labour to remove and refit the centre and cw&p

And yes the manuals run 3.5 as std - the autos run 3.7 std. This is why the best ratio fits when running 32's are 3.9 for manual and 4.1 for auto if you are looking for a return to std gearing.

[Buster85]

I have auto deisel and was wanting to no if I change the rear ratio from 3.7 to 4.1 will I need to change the front. What will happen If the ratios are different. Running 31 coopers and not concerned with price as my dad owns a differential shop. He's got the 4.1 to try but diddnt want to bang them in. aNd stuff something. I'm just trying to improve fuel economy and the auto won't change properly. It kicks into top
gear at bout 130 unless I take foot of accelerator at 80 km then it kicks in and can put my foot back down it shits me so any idvice would be appreciated. Cheers Alex

[amitch888]

Definately do both I would have thought or it just wont work. Could do the rear to see how you like it but I certainly would NOT stick it in 4wd until you have done both. Best speak to ya old man if he is a diff pro....

[Buster85]

Cheers mate. He told me to do both but just wanted to do the rear first to see if it helps. I didn't want to stuff my gearbox so as long as I don't go 4wd it should be fine to try

[Hilux Max]

edited: now confirmed that 4.3 landcruiser 100 diff gears are not compatible.

[rodw]

Max, this was a good find but I think more research is required. If you go back to the first post, there is a link to the ARB Air Locker Application chart and while it confirms the Hungie has an 8" clamshell diff, the part number for the ARB locker is different. Certainly for those who want to go past 32's, the 4.3 would be a better match.

100 series ARB RD 132
Hilux 150/Prado 120 (3.91 and up) ARB RD 111

The link in this bible to the ARB chart was broken, and I have edited the first post to correct this error. Here it is repeated again below:
http://www.arb.com.au/media/products/ai ... _chart.pdf

[Hilux Max]

Rod,

that was my thinking initially too......that the 100 series front end was different which spurned me into action and following this up with LockdUp...like they said, they will confirm this with their diff bloke and get back to me and I'll post responses back up here.

[cory]

So running 32's would require 3.95 gears for a manual d4d? Where can I sorce these for front and back? Are they prado standard gears? Will they go straight in to hilux diff? Does this change the arb locker model required for my lux?
RODW I've heard u have this setup?? Any info appreciated...

[Hilux Max]

Cory, what you ask is in this bible.....go through the 4 or 5 pages and your questions will be answered in plain english.