Drive Train Gearing Bible

[Noidea]

Thanks heaps, now to go splash some cash

[Noidea]

Just another annoying question guys, found an 06 prado 120 series, 1KZ turbo diesel with 45000k's front diff from a wrecker in Sydney for $770. Just wondering what anyone else has paid for a used front diff???
Oh and it has the 4.1's I need

Cheers, Josh

[VMN]

Just another annoying question guys, found an 06 prado 120 series, 1KZ turbo diesel with 45000k's front diff from a wrecker in Sydney for $770. Just wondering what anyone else has paid for a used front diff???
Oh and it has the 4.1's I need

Cheers, Josh

Grab it mate that's what I paid and it is dirt cheap at that. Very hard to find under $1k

[Noidea]

Just another annoying question guys, found an 06 prado 120 series, 1KZ turbo diesel with 45000k's front diff from a wrecker in Sydney for $770. Just wondering what anyone else has paid for a used front diff???
Oh and it has the 4.1's I need

Cheers, Josh

Grab it mate that's what I paid and it is dirt cheap at that. Very hard to find under $1k

Done, the prado front diff is sitting in my garage. Thanks for the advice. Be heading to ARB at artarmon in the next few weeks to get the rear gears and lockers put in

Josh

[rodw]

Done, the prado front diff is sitting in my garage. Thanks for the advice. Be heading to ARB at artarmon in the next few weeks to get the rear gears and lockers put in

Josh

Great stuff mate,What are you doing for the rear gears? VMN can help out with an aftermarket rear gear set. They just organised to fit it into my truck to replace the one I broke. It is about half the price of the Toyota Crownwheel and pinion which sells for $1020. I'll give him an hour or so to have dinner and then get onto him to post up some details. But here is my diff with brand new 4.1's ready to be fitted tomorrow:

[Noidea]

Done, the prado front diff is sitting in my garage. Thanks for the advice. Be heading to ARB at artarmon in the next few weeks to get the rear gears and lockers put in

Josh

Great stuff mate,What are you doing for the rear gears? VMN can help out with an aftermarket rear gear set. They just organised to fit it into my truck to replace the one I broke. It is about half the price of the Toyota Crownwheel and pinion which sells for $1020. I'll give him an hour or so to have dinner and then get onto him to post up some details. But here is my diff with brand new 4.1's ready to be fitted tomorrow:

Not sure what im doing yet Rod, ARB have told me they can supply a terrain tamer 4.1 rear set for about $560 or so but I have no idea if they are any good or not. Quick question though, should I get a new bearing set as well? Again arb have said that I may need a new one as its hard to get the old gears out without destroying the bearings. Now does this apply to both the front and the rear? Because they only mentioned that to me about the rear gears??

I have been looking at the VMN rear set just a minute or so ago and it really looks the goods. and is cheaper than what I have been quoted.

Thanks for your help mate.

Josh

[VMN]

Josh,

I think ARB are right, my installer said I would need new bearings as he reckoned the same thing about the bearings. The pinion bearings are pressed in so it's probably not a good idea to pull off and reuse even if they aren't damaged in the process. At the very least you will need a new pinion seal and a crush tube for the Terrain Tamer diff but it will be required with the VMN Nitro gears to correct the pinion spline difference.

It is not an issue for the front diff you purchased as it is all assembled but remember to reuse the Hilux axle tube as the Prado one is a different part number.

[Surfseeker]

Fantastic thread guys.....
Just seeking final clarification before choosing a new set of tyres so I know where the "Tipping point" lies between needing a re-gear or not..
From this thread it seems clear that a re-gear is a good idea when running tyres of 32 inches or above.
Most of you seem to run 265/75R16's. Correct me If I am wrong but that size is actually more like 31.5 inches than 32. Why am I splitting hairs? Because I currently run 265/65R17 tryes which works out at 30.5 inches. These seem OK and as this is the same size as the 2010 update (which I believe shares the same gearing as the earlier models fitted with 29's from the factory???) gearing should be acceptable if not ideal. At least the speedo is 100% accurate!!!!
The next size up (which was what I was considering) is 265/70R17. These are 1 inch bigger so 31.5 inches. Initially I thought that would be OK without a re-gear as it was below 32 inches.
However on closer examination it appears to be exactly the same diameter as the 265/75R16's most of you run! So there lies my dilema...when is a 32 not a 32?
Am I right in saying the "Tipping point" actually is a bit lower than 32 inches and that a re-gear is preferable with 31.5's.

Cheers

Scott

[Noidea]

Fantastic thread guys.....
Just seeking final clarification before choosing a new set of tyres so I know where the "Tipping point" lies between needing a re-gear or not..
From this thread it seems clear that a re-gear is a good idea when running tyres of 32 inches or above.
Most of you seem to run 265/75R16's. Correct me If I am wrong but that size is actually more like 31.5 inches than 32. Why am I splitting hairs? Because I currently run 265/65R17 tryes which works out at 30.5 inches. These seem OK and as this is the same size as the 2010 update (which I believe shares the same gearing as the earlier models fitted with 29's from the factory???) gearing should be acceptable if not ideal. At least the speedo is 100% accurate!!!!
The next size up (which was what I was considering) is 265/70R17. These are 1 inch bigger so 31.5 inches. Initially I thought that would be OK without a re-gear as it was below 32 inches.
However on closer examination it appears to be exactly the same diameter as the 265/75R16's most of you run! So there lies my dilema...when is a 32 not a 32?
Am I right in saying the "Tipping point" actually is a bit lower than 32 inches and that a re-gear is preferable with 31.5's.

Cheers

Scott

Mate i run 31's now and mines not regeared yet (in the process) because ill be running 33's very shortly so i personally wouldnt bother with 31's (even if its 31.5). If you did re gear and decided to go bigger tyres again then you may want to re gear again and thats just a waste of money. But hey if you got the cash to splash and you dont think you will run bigger tyres then go for it but IMHO i wouldnt bother.

Josh

[VMN]

I think there are some variances as the 265/75 R16's I fitted are exactly 32" according to manufacturer. All the specs in this thred are theroetical. But I will say the move to 4.1s saved fuel

[Jack S]

I think there are some variances as the 265/75 R16's I fitted are exactly 32" according to manufacturer. All the specs in this thred are theroetical. But I will say the move to 4.1s saved fuel

Save feul, that's definately the reason why I'll be changing my ratios rod, feeling the effects of the 33's....

[Surfseeker]

So If I have got this right....
It seems then that 30.5 inch tyres will be fine as they are.
32's or above will need to re-gear. This is good to do but probably a bit costly for me....
31's seem to be kind of in "no mans land"....A bit tall for stock gearing, but not tall enough to allow you to regear.
So It seems you basically either stick with 30.5's (which are now the standard size on the SR5) or make the jump to a much taller tyre.

[Hilux Max]

How are 31's too tall for stock gearing?

31's will give you a much more accurate speedo reading via GPS than the factory speedo does.

The FJ Cruiser has the same drivetrain as the hilux V6 and will come with almost 32's as standard.

If I had a manual and 33's I wouldnt bother regearing, if I went bigger than that then maybe.

If you have an auto and 33's then I reccomend a regear as the first gear in the autos is too tall.

32's.....wouldnt even bother with it.

just my 2 cents.

[KTM525EXC]

How are 31's too tall for stock gearing?

31's will give you a much more accurate speedo reading via GPS than the factory speedo does.

The FJ Cruiser has the same drivetrain as the hilux V6 and will come with almost 32's as standard.

If I had a manual and 33's I wouldnt bother regearing, if I went bigger than that then maybe.

If you have an auto and 33's then I reccomend a regear as the first gear in the autos is too tall.

32's.....wouldnt even bother with it.

just my 2 cents.

I would agree 100% here with max, surfseeker I think ya splitting hairs lol in a perfect world yes a regear but for the small gain you would get regearing with 31s it's money better spent else where. For 33's in a manual I think it's worth regearing. I run 32s in a manual with no dramas imho

Cheers Troy

[gavishuge]

Hey guys have a good question for you regarding the regearing process. If i were to purchase the 4.556 front and rear crown wheel and pinion gears from Locktup 4x4 and then purchase the 120 Prado front diff carrier. Would this be a fit and how would my Hilux Diesel Auto run on 33's using this setup?

Regards
Gav

[Hilux Max]

Hey guys have a good question for you regarding the regearing process. If i were to purchase the 4.556 front and rear crown wheel and pinion gears from Locktup 4x4 and then purchase the 120 Prado front diff carrier. Would this be a fit and how would my Hilux Diesel Auto run on 33's using this setup?

Regards
Gav

Gav, refering back to the first page you will find the following quoted by RodW -

Diesel Auto (3.727:1 Diff)

Code: Select all

Tyre    Percent  Required   
Size     Stock      Diff
(in)    Size      ratio
*****   *******    ********
29      100.00%    3.73
30      103.45%    3.86
31      106.90%    3.99
32      110.34%    4.12
33      113.79%    4.24
33.5    115.52%    4.31
34      117.24%    4.37
35      120.69%    4.50

That will give you an idea of how your vehicle will rev with 4.5's installed. 4.5's will bring the performance back to stock on 35" tyres...therefore on 33's, being smaller, you will have greater acceleration than standard and a slower crawl speed in low range. Your vehicle will also rev slightly higher than factory at 100kph.

Now the 4.5 gears that Locked Up stock, VMN also stock on this forum.....they are a thick cut gear and fit into the factory 3.73 and lower ratio'd carrier.....so a Prado carrier is uneccessarry.

That should help.

edit: Take the time when you have it and go through this gearing thread from start to finish....you'll pick things up as you go along and understand it better.

[VMN]

Hey guys have a good question for you regarding the regearing process. If i were to purchase the 4.556 front and rear crown wheel and pinion gears from Locktup 4x4 and then purchase the 120 Prado front diff carrier. Would this be a fit and how would my Hilux Diesel Auto run on 33's using this setup?

Regards
Gav

Max beat me too it but this is what I wrote before he got in.

Gav indeed a good question. The gearset you are referring to is the "thick cut" one referred to in the bible. That means it will fit your existing carrier and you don't need to buy the Prado carrier. You will also need to get the RD121 locker from ARB which will fit your truck now.

This link is a bit hard to read but it sets it out
http://www.vehiclemods.net.au/toyota-hilux-150vigo.html

4.3's which don't exist would be better than 4.5's for the auto but the rpm is not much difference than 31's on stock diffs at 200 RPM error at 100 km/hr. I would say you will definitely be looking to correct your speedo as you'll be showing 130 km/hr on the highway or something silly like that.
VMN can arrange the Locktup diffs for you so send me a PM if you want to go further.

Rod

[gavishuge]

Max and Rod,

Many thanks as always for putting things into perspective. Was thinking of the 4.1 gearset, but dont want to purchase anything from Toyota if possible. I do very little crawling and am not fussed about highway speeds, may just mean i go for a similair tyre setup as Racecam if i do the 4.5 gearset change instead of 33's lol.

Rod, will keep you posted with regards to purchasing those items

Thanks again for the help guys!

Regards
Gav

[Buster85]

Just wanted to no if a front 4.1 diff cw+p out of a 03 ifs hilux will fit my hilux or if anyone has the part number I need for a 4.1 cw + p cheers

[Hilux Max]

the rear will fit but not the front, the front diff is 7.5 " the current hilux is an 8" front diff