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Old 07-10-2008, 08:04 AM   #21
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When you make a turn, the inside wheel (if your turning right, it would be the right wheel) has to rotate less than the outside wheel. In 2wd this is easy because the wheels are spinning freely. In 4x4 both of your front wheels are spinning at the same speed when you try to turn, thus making it harder to turn. This is one of the reasons why your NOT supposed to ever run 4x4 on pavement*.

* Excluding snow
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Old 07-10-2008, 08:07 AM   #22
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so if I have a sr5 4x4 (non trd) what kind of rear differential do I have? I don't have the rear locker so I'm assuming the LSD.
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Old 07-10-2008, 08:08 AM   #23
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Quote:
Originally Posted by 05TacoTRD View Post
When you make a turn, the inside wheel (if your turning right, it would be the right wheel) has to rotate less than the outside wheel. In 2wd this is easy because the wheels are spinning freely. In 4x4 both of your front wheels are spinning at the same speed when you try to turn, thus making it harder to turn. This is one of the reasons why your NOT supposed to ever run 4x4 on pavement*.

* Excluding snow
I guess I don't understand, if both the front wheels are spinning at the same speed when turning, wouldn't that make it a front locker?
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Old 07-10-2008, 08:11 AM   #24
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Quote:
Originally Posted by das56170 View Post
so if I have a sr5 4x4 (non trd) what kind of rear differential do I have? I don't have the rear locker so I'm assuming the LSD.
non-trd, u prolly have an open. if u have an lsd, u should have a sticker on the diff that says that
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Old 07-10-2008, 08:24 AM   #25
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I had a Wrangler with front and rear lockers and the difference is night and day as to how it worked compared to a non locked diffs.
Locked is what you need for offroading in more seriouse areas.
Locked rocks for rock ,mud and pretty much anything offroad.
Locked will mess with you on dry hard surfaces.
4X4 is is really more like left front and right rear if you are on slippery surface.
Still better than two wheel drive but not as good as a posi diff or locked diff's w/4X4.
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Old 07-10-2008, 08:56 AM   #26
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Good info here.

One question. On a TRD PreRunner, will the locker engage automatically if the rear wheels start slipping, or will it have to be manually engaged?
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Old 07-10-2008, 09:02 AM   #27
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Quote:
Originally Posted by bambooshoots View Post
Good info here.

One question. On a TRD PreRunner, will the locker engage automatically if the rear wheels start slipping, or will it have to be manually engaged?
an LSD will if u have the sport....if u have an OR, then u have to hit the button. and only do that at low/no speeds
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Old 07-12-2008, 07:11 AM   #28
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Quote:
Originally Posted by jhodge83 View Post
non-trd, u prolly have an open. if u have an lsd, u should have a sticker on the diff that says that
Just checked. I have the lsd. Its funny...when I bought the truck I didn't even think about these options. I just wanted to make sure I had 4X4
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Old 07-12-2008, 07:56 AM   #29
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Quote:
Originally Posted by 05TacoTRD View Post
When you make a turn, the inside wheel (if your turning right, it would be the right wheel) has to rotate less than the outside wheel. In 2wd this is easy because the wheels are spinning freely. In 4x4 both of your front wheels are spinning at the same speed when you try to turn, thus making it harder to turn. This is one of the reasons why your NOT supposed to ever run 4x4 on pavement*.

* Excluding snow
Actually, the front wheels each turn at different speeds when turning, as they follw a different arc than the rear. When turning each of the 4 tires are turning at different speeds. In 4x4 and in a turn, since the front is recieveing the same rpm as the rear, yet tuning at a different speed, the drivetrain binds............I know this is what you meant to say, but Im bored so I thought I would add some more detail.
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Old 07-12-2008, 08:12 AM   #30
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Quote:
Originally Posted by klown View Post
I guess I don't understand, if both the front wheels are spinning at the same speed when turning, wouldn't that make it a front locker?
They'll never be turning at the same speed or distance while turning. The inside wheel will always be turning less and cover less distance than the outside wheel. That's why the differential is OPEN because its designed to allow each wheel to spin freely at its own rate especially for turning.

Majority of the reason why you have such a hard time turning while in 4WD is mostly due to the CV joints at each front wheel. In 2wd, the CV joints are *going along for the ride* with no torque being applied to them. In 4WD - the CV joints are 'driven' and thus experiencing torque.

Imagine these swivel sockets as your CV joints. When they are perfectly straight (up/down), they're easier to spin without a lot of pressure. But if you bend them (as seen in the picture) and try to spin them, they won't spin as easily. Same scenario with the CV joints.


Although - on a side note - you'd think the OPEN differential would prevent this CV joint bind-up from happening. The front axle shafts themselves never transfer that bind-up pressure to the front differential - so it can't compensate for it.
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Old 07-14-2008, 12:16 AM   #31
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Quote:
Originally Posted by Janster View Post
...I'll try to explain the basics to ya...

There's a few different 'rear differentials' on the tacomas.
1) OPEN differential
2) LSD differential
3) Auto LSD
4) Locking differential

An Open differential (or open CARRIER) is what most cars/trucks have. Hard to explain - but when you make a turn, the rear wheels aren't going at the same speed or distance. Having this variance - the carrier needs to adjust for it allowing one wheel to stop turning (or slip). For example: If one wheel is in the air - all the power will go to the wheel with least resistance (tire in the air). Thus, the tire on the ground is sitting there motionless. That means, you're not moving at all.

An LSD differential has a different carrier that allows for some traction in certain situations. It uses clutches in the differential, that force both wheels to be driven together up to a certain torque load when the clutches release and you have an OPEN diff. An LSD differential is better than an OPEN diff for traction offroad. The LSD is automatic and works at all times without you knowing it.

3) An AUTO LSD (on trucks with VSC stuff) has an OPEN diff/carrier but uses the brakes to prevent any rear wheel to stop spinning. This is supposed to aid in tractin also...but I personally don't have any experience in how that all works.

4) The Tacoma locking differential is selectable. That means, you can turn it on or off at anytime (Prerunners only). When the locker is OFF - you have an OPEN differential. When the locker is ON - the two rear wheels are LOCKED in. Both wheels will spin at the same rate all the time. If you have one wheel off the ground - the power will continue to drive both wheels.
On the 4X4 models - you have to be in 4Lo range to turn the locker on.


There's a heated debate on the capabilities of the locked 4x2 versus a 4x4.
For ultimate offroading capabilities - you'll wanna get a 4x4 with the TRD Offroad package (rear locker).
If you drive in any snow - I'd highly recommend the 4x4 with the LSD.
In a 4x2 and have the locker - you should avoid using the locker for daily driving (unless you're in snow and need it).
you dont have to have it in 4 lo nemore to lock the rear.its about a 5 minute fix and u can lock it in in 4hi 4lo and 2wheel.just look it up on google and shows u how to do it
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Old 07-14-2008, 04:01 AM   #32
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Quote:
Originally Posted by mark155490 View Post
you dont have to have it in 4 lo nemore to lock the rear.its about a 5 minute fix and u can lock it in in 4hi 4lo and 2wheel.just look it up on google and shows u how to do it
I already knew that. From the factory - you can't use the locker in 4hi.

The reason I didn't mention this modification, is because if you break something while in 4hi using the locker - you might have a hard time getting things replaced under warrantee.

The 4X4 is still more capable than the 4X2 in more extreme offroading situations. The 4X4 can be modified even more to make it spank the 4X2.
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Old 07-15-2008, 07:42 AM   #33
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Originally Posted by jhodge83 View Post
damn...i wanted to get a 4x4 sport, but u guys might be making me change my mind...lol
get the offroad and color match everythning later. and forget the scooped hood. looks cool but is non functional and gets in the way on trails.
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Old 07-16-2008, 09:04 AM   #34
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how difficult would it be to install a locking rear diff in my 08 reg cab prerunner?
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Old 07-16-2008, 10:59 AM   #35
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Quote:
Originally Posted by Janster View Post
They'll never be turning at the same speed or distance while turning. The inside wheel will always be turning less and cover less distance than the outside wheel. That's why the differential is OPEN because its designed to allow each wheel to spin freely at its own rate especially for turning.

Majority of the reason why you have such a hard time turning while in 4WD is mostly due to the CV joints at each front wheel. In 2wd, the CV joints are *going along for the ride* with no torque being applied to them. In 4WD - the CV joints are 'driven' and thus experiencing torque.

Imagine these swivel sockets as your CV joints. When they are perfectly straight (up/down), they're easier to spin without a lot of pressure. But if you bend them (as seen in the picture) and try to spin them, they won't spin as easily. Same scenario with the CV joints.


Although - on a side note - you'd think the OPEN differential would prevent this CV joint bind-up from happening. The front axle shafts themselves never transfer that bind-up pressure to the front differential - so it can't compensate for it.
you're like a truck scientist....
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Old 07-16-2008, 02:40 PM   #36
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Exactly how long is the Locking Rear Diff light supposed to be blinking?

So, I pressed the button and the ABS light comes on and the rear lock symbol starts flashing, but continues to flash for a long time. After a minute I got tired of waiting and turned it off.

Is something wrong with the rear locker on my PreRunner?
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Old 07-16-2008, 03:47 PM   #37
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Quote:
Originally Posted by joedart View Post
how difficult would it be to install a locking rear diff in my 08 reg cab prerunner?
Depends ... There are lots of different types of lockers available. Some are cheaper while others can be expensive. The cheaper variety tends to have funky street manners while the expensive ones (selectable) you don't even know they're there....

The cheaper spider gear replacement lockers are easy to install for the do-it-yourselfer. While the more expensive carrier replacement lockers involve gear setup and more professional installation. (in a nutshell)

It's a whole new world to research..... You need to find out what size differencial you have and research what's available to you. Not all diffs are the same.
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Old 07-17-2008, 04:51 AM   #39
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Well, with the locking diff light still blinking, I slowly eased forward and soon it clicked into play.

I guess it just hadn't been used in so long.

I have a question: how exactly is the locking rear diff supposed to act? I tried again today; pressed the button and the diff lock symbol blinked continuously until after 30 seconds I eased forward the the blinking light become solid. However when I stopped and hit the button to deactivate the locker, the light stayed on for quite a while; I started to move the vehicle again after about 30 seconds of waiting and the locker stayed locked, then deactivated after I traveled a few yards.

Is this normal for the locker? Or should it be deactivating/activating completely when you push the button and before moving?
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Old 07-17-2008, 04:13 PM   #40
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Quote:
Originally Posted by timmer View Post
D'oh you almost always have to move forward or backward some before it will engage or disengage.

I have had some luck getting mine to both engage and disengage while creeping forward very slowly.

I have a manual transmission.
Allright, that's good to know.

The way the manuals states, I was under the impression that it had to be fully engaged/disengaged before you should start moving.
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