Gx470 rear locker

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Tech Question: Center Locking Dif on a Lexus GX470

I decided to test out the GX on some easy trails yesterday, when I ran into a 4x4 club with 5 Jeeps. They invited me along, and I quickly found myself on some trails that I never thought were possible in a Lexus.

The Jeeps were all modified with lifts and at least 33" tires; some of them were very modified. My GX is stock other than 2.5" lift and 31" tires (and a few non relevant things (I have a 2006 non KDSS model)).

At the end of the day, they admitted that they were all impressed with how well I drove (for being a 4x4 newb) and how well the Lexus did. They even took turns following me to see how the traction control worked, and they said it was fun to watch a Lexus with the wheels so far in the air. Since most of the people in their club has jeeps, they were used to having much more travel and a shorter wheel base, so the GX was a different animal than what they were used to running trails with.

I had it in 4Lo with the center dif locked and in 1st gear. We were running on trails that had bumps where opposing tires would be in the air (like the weight of the vehicle would be on front driver and rear pax wheels, and the others would be dangling in the air). With a tire in the air, they said that the tire in the air would spin for a split second, and then it would jerk spin-stop-spin-stop a few times a second, where it was obviously also sending power to the wheel on the ground. I could hear and feel this happening, and as long as I had two wheels on the ground, I could move forward. Often times, the front would drop, and I would have three wheels on the ground with just one rear tire in the air, but it would work just as well with two in the air.

So apparently I don't understand how a center locking dif works. The GX has VSC that is disabled when the center dif is locked. My understanding was that locking the center dif would send the same amount of torque to both front and rear (50-50 split) but since I don't have a locking front or rear dif, I thought they would still act as an open dif, where one tire could spin and take all the torque to that axle. This obviously isn't the case because of what I described above.

I am hoping that someone here can help me understand what is going on here. I understand how locking differentials work for a front and rear, but it seems like a center locking dif wouldn't be much help with an open front and rear dif. The Jeep guys decided that it was some type of computerized system that would apply the brakes on the spinning wheel that was in the air, pushing torque to the wheel with traction. I don't think this is right, but I don't have a better theory either. My searching on here and on Google has provided a little info on what it does, but not how, and I am obviously still confused.

 

Sours: https://expeditionportal.com/forum/threads/tech-question-center-locking-dif-on-a-lexus-gx470.124795/

Harrop Rear E Locker to suit Toyota LandCruiser, Prado / LX, GX 150 Series /GX 470 2009 – 2018

Harrop Rear E Locker to suit Toyota LandCruiser, Prado / LX, GX 150 Series /
GX 470 2009 – 2018 – ELOCKER

YOUR ELECTRONIC PUSH BUTTON SOLUTION

In collaboration with Eaton Corporation we have developed the Harrop Eaton ELocker Differential for a range of popular 4WD vehicles. The ELocker’s electromagnetic locking mechanism is the next generation of aftermarket differential technology. The Harrop Eaton ELocker performs as an open differential until you decide that you need more traction, designed expressly for 4-wheel drive systems to give you the ability to lock or unlock the differentials when necessary. When locked the Harrop Eaton ELocker performs as a full locker, capturing 100% of the available torque and sending it equally to both ends of the axle

NO AIRLINES, NO COMPRESSOR – JUST TRACTION

The ELocker is built with precision-forged gears that are designed to mesh perfectly, providing improved strength and durability over a standard cut gear. Its ease of installation, reliability and push button activation make ELocker an absolute must for all traction off-road performance applications.

Sours: https://www.oppositelock.com.au/product/performance/drivetrain/e-locker/harrop-rear-e-locker-to-suit-toyota-landcruiser-prado-lx-gx-150-series-gx-470-2009-2018/
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So my second hand around the shop (lexmedic157) acquired an 08 FJ elocker third complete with the motor for a good deal after I told him I would help with the retrofit. So we finally got around to installing it into his 07 4Runner the other day. Turned out real well and was surprisingly easy to fit into his axle housing.

I started by reading all kinds of threads about doing the retrofit on the older Tacomas and 3rd gen 4Runners to get an idea of what we were in for. Turns out with the 4th gens there's no welding involved. Only took a bit of grinding and drilling/tapping out 4 holes and it was ready to go.

We choose to pull the entire axle out of the truck to make the modifications easier. You could probably do it with the housing still installed if you really wanted to though.

Tools needed once the 3rd is out:

grinder (I used one with a flap disk on it)
17/64 drill bit
M8 x 1.25 tap

Parts needed:
Elocker 3rd
Elocker gasket (used to marking for the modifications)
2 of the long mounting studs


The easiest way to see what needs to be modified is to have an elocker gasket on hand. Lay it down on the axle and trace out the notch for the shift fork and mark the 4 holes that need to be drilled.



Then do your grinding and drill/tap out the holes, just make sure the holes are straight or you'll have a hard time getting the 3rd to drop down over the studs.



If you look close you can see in the above picture where we not only notched the opening for the locker fork and drilled the new holes but we also had to knock down a small little bit at the top right, it was raised up just a touch from the mounting face so I just hit it real quick with the flap disk to bring it down.
Then put everything back together!

Sours: http://www.toyota120.com/forum/showthread.php?t=27306
Install a Locking Rear Diff - The Mostly Correct Guide

Old 12-14-2016, 09:29 PM
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The only 4th Gen 4Runner that came with a rear E-Locker was the extremely rare "Trail Edition", but I believe it only was offered as a V6 anyway.

If you're hung up because lack of a rear locker option, I'd say just find the right platform that was well maintained, fits your budget, is rust free, and ad a locker later:

- FJ E-Locker retrofit into 4th Gen or GX
- There is now an aftermarket company offering E-locker 3rds: Harrop I believe?
- Or just run an ARB air locker - use the required compressor for the locker to also help air up your tires.

If your not planning to re-gear, a rear e-locker is not terribly expensive to accomplish.

GL!

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Old 12-27-2016, 05:39 PM

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No factory GX came with a locker. If you're familiar with the ATRAC system, you can do wonders without one. Also, EVERY GX has rear air suspension. Certain GX's have KDSS, which is hydraulically adjusted swaybar links to improve off road suspension travel and on road manners.

My opinion on the best years? 03-04. No VVT-i, no secondary air systems. Also, try and find one without navigation, because the HVAC is integrated into the display and there are 0 aftermarket options.

Pull the running boards, put on a good set of AT tires, and you'll be shocked where a GX will take you.

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Old 12-28-2016, 12:55 PM
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Quote:

Originally Posted by BlackCat914View Post

No factory GX came with a locker. If you're familiar with the ATRAC system, you can do wonders without one. Also, EVERY GX has rear air suspension. Certain GX's have KDSS, which is hydraulically adjusted swaybar links to improve off road suspension travel and on road manners.

My opinion on the best years? 03-04. No VVT-i, no secondary air systems. Also, try and find one without navigation, because the HVAC is integrated into the display and there are 0 aftermarket options.

Pull the running boards, put on a good set of AT tires, and you'll be shocked where a GX will take you.

I can't speak to the GX470's, but GX460's all have KDSS, while some have rear air suspension (higher trim models).

Rear locking differentials was not a factory option for the US market, but was/are available on the the 150 Prado's overseas.

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Old 12-28-2016, 10:54 PM

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Quote:

Originally Posted by BumboView Post

I have a 4th Gen 4Runner in v6 and really sad to see they took away the v8 option on the 5th Gens so here I am... v8 is the only thing I feel like I wish I had (at times) but the extra room under my current truck made for a nice dual battery setup.

It looks like if you still want a Torsen center transfer case you need to get a Limited or a GX as well.

I really want a rear locking diff in addition to a locking torsen center... do any of the GX trims include that or am I missing something?

I really like to enjoy these trucks as off-road / adventure tools and which would be the best trim to start building on?

I understand the highest level trim comes with air suspension, which I would actually end up deleting in due time for some larger body spring/shock/coilover setup.

Let me know if you ever get a gx and pull the RAS. I love the rear air ride and would love to have some cheap spare parts
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Old 01-18-2017, 04:25 PM

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I'm almost 99.9% sure a FJC rear end bilt right up!

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Old 01-18-2017, 10:18 PM

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I have a family of 5 and it it's used as a kid hauler. Add groceries, luggage or in laws and things get heavy. But the reason air suspension always keeps things level. I love it.

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Old 01-20-2017, 11:37 PM

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Quote:

Originally Posted by Jaysen4runnerView Post

I'm almost 99.9% sure a FJC rear end bilt right up!

Hmmm. Anything to support this? That would be sweet. I should have kept the ARB from the 4Runner...dangit.

Quote:

Originally Posted by BumboView Post

Just curious but what do you like about it and what type of driving do you do?

If I was towing with that truck I would probably opt to keep it for load leveling but I wasn't sure of its performance off-road.

Load leveling is awesome. Hooking up to the boat is awesome with the ability to raise/lower + back up cam (literally everything else about having the factory nav sucks, though).

Quote:

Originally Posted by MorphyneView Post

I have a family of 5 and it it's used as a kid hauler. Add groceries, luggage or in laws and things get heavy. But the reason air suspension always keeps things level. I love it.

Agreed. When you put a whole pile of people/gear in there, it's nice that it just clicks on and pumps you back up to where it rides nice. Although, if I didn't still have 3 years/50k left on the warranty, I'd think long and hard about switching over to traditional setup.

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Old 01-20-2017, 11:51 PM

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I'm almost 99.9% sure, 4runner,gx470 and fjc share the same rear end 8' diff and all same link brackets. Everything should be swap in and out 100% bolt in, if anything maybe the abs but almost sure it's all the same also. I'm not new to the Toyota world of trucks, I do rock crawling for years and most crap are swappable and interchangeable. I would consider a fjc diamond rear end in a gx470 due to the weight and the v8 engine.

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Old 01-21-2017, 12:00 AM

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Gotcha. Thanks! I don't think I could justify a diamond. Don't even know if I can justify ARB at this point lol too many hobbies, and the GX does fine for my purposes right now. But one day...

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Old 01-25-2017, 01:22 AM
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@DeathCougar has a locking rear axle from an FJ for sale.

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Old 01-25-2017, 02:31 AM
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Quote:

Originally Posted by Jaysen4runnerView Post

I'm almost 99.9% sure, 4runner,gx470 and fjc share the same rear end 8' diff and all same link brackets. Everything should be swap in and out 100% bolt in, if anything maybe the abs but almost sure it's all the same also. I'm not new to the Toyota world of trucks, I do rock crawling for years and most crap are swappable and interchangeable. I would consider a fjc diamond rear end in a gx470 due to the weight and the v8 engine.

GX470 has air suspension I believe, so that might make a difference. Toyota says they have different part numbers

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Old 01-25-2017, 09:59 AM

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Quote:

Originally Posted by DeathCougarView Post

GX470 has air suspension I believe, so that might make a difference. Toyota says they have different part numbers

That true, but if it's just a matter of cutting off the mounts and welding the air suspension mounts, it could be something that someone is able to do? lol

The FJ is the same width?

Just curious...how much are you selling for?

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Old 01-25-2017, 06:01 PM

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Everything bolts up just the air bag part but metal tech conversion and your set. I don't think it's that hard at all.

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