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Unread 01-05-2010, 02:40 PM   #1
ronjenx
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Tru-Lok Inner Workings

Someone on another forum asked how the Tru-Lok on the JK works.
This is what I posted. Thought some people here might be interested, too.

Reference the picture below.
The Electromagnet causes the Moveable Dog Clutch to engage the square teeth on the side gear.
This locks the side gear to the differential case, making the side gear turn only with the case.
This makes the spider gears unable to spin on their pins.
Since the spider gears can not spin, they drag the other side gear around with the case.
In the JK Tru-Lock differential, there are 4 spider gears, not just two as pictured.

End result: Both axles have to spin with the differential case, all as one unit.



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Unread 01-05-2010, 03:26 PM   #2
MattJK09
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Quote:
Originally Posted by ronjenx View Post
Someone on another forum asked how the Tru-Lok on the JK works.
This is what I posted. Thought some people here might be interested, too.

Reference the picture below.
The Electromagnet causes the Moveable Dog Clutch to engage the square teeth on the side gear.
This locks the side gear to the differential case, making the side gear turn only with the case.
This makes the spider gears unable to spin on their pins.
Since the spider gears can not spin, they drag the other side gear around with the case.
In the JK Tru-Lock differential, there are 4 spider gears, not just two as pictured.

End result: Both axles have to spin with the differential case, all as one unit.


I'm lost, but very informative post!
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Unread 01-05-2010, 06:02 PM   #3
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Here is some more background music....
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Unread 03-12-2015, 03:52 AM   #4
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I've spent a lot of time trying to find information about how the Rubicon locker works and keep coming across this thread.

A couple of years after this thread was made an absolutely fantastic thread was started on this same forum that explains everything really clearly but for some reason this is the thread I keep coming across. I know this thread is now rather old but I thought I'd post a link to the OEM Rubicon Locker Study thread to guide others following the same footsteps as me.

Enjoy: http://www.jeepforum.com/forum/f96/o...study-1476570/
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Unread 03-12-2015, 06:24 AM   #5
LIJeepJC
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Can you engage, or SHOULD you engage the lockers when driving on say a snow covered road? Or is it strictly for low speed crawling?
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Unread 03-12-2015, 07:27 AM   #6
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Without modification the tru-lock can only be engaged in 4lo.
I would not lock my axles in snow and especially not in snow above 30mph. Reason is when locked the rig does not want to turn (rear wheels both turning at same speed wants to understeer, so more steering input is required). Snow ice etc takes away the front traction, no front traction and severe understeer could be very disastrous.
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Unread 03-12-2015, 07:47 AM   #7
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Quote:
Originally Posted by jwmbishop View Post
Without modification the tru-lock can only be engaged in 4lo.
I would not lock my axles in snow and especially not in snow above 30mph. Reason is when locked the rig does not want to turn (rear wheels both turning at same speed wants to understeer, so more steering input is required). Snow ice etc takes away the front traction, no front traction and severe understeer could be very disastrous.
To add to that, lets say you have the rear locked, and the tires lose traction. The rear end can, and probably will, swing to one side, leaving you headed for the ditch, or on-coming traffic.

Unlocked, one tire can spin while the other retains some traction to keep the vehicle straight.
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Unread 03-12-2015, 08:43 AM   #8
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Quote:
Originally Posted by ronjenx View Post
To add to that, lets say you have the rear locked, and the tires lose traction. The rear end can, and probably will, swing to one side, leaving you headed for the ditch, or on-coming traffic.

Unlocked, one tire can spin while the other retains some traction to keep the vehicle straight.
Makes sense... Thanks!
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Unread 03-12-2015, 08:44 AM   #9
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This is always a contentions subject with people's opinions spanning the full range....
If you're in 4wd, we're assuming that conditions are bad and hopefully you're not driving very fast... The faster you're driving, the less you're going to be turning so the locker "shouldn't" rear it's ugly head. The side slip should only manifest in low speed driving like turning at in intersection.
You'll find people that have had auto lockers for decades and swear by them. You'll also find people that say lockers will murder your pets in their sleep....
Personally I put an LSD in the rear of mine and a full locker in the front. So far, it's been invisible.

There are some fantastic older videos on YouTube that show step by step how a differential and locker works..
The guy that invented the Diff was a freaking genius.
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Unread 03-12-2015, 09:30 AM   #10
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Quote:
Originally Posted by paul84043 View Post
You'll find people that have had auto lockers for decades and swear by them. You'll also find people that say lockers will murder your pets in their sleep....
Absolutely. And I think a GOOD "mechanical operator" can support either style.

Its just not an anticipated vehicle reaction set I prefer!

I kinda like your approach... is your front a detroit or selectable? (I tend to lean away from detroits in front - possibly the old front drive drag experience... no other real world experience)
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