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Old 07-20-2018, 11:22 PM
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Special edition with factory rear locker

I have a Big Bear with a factory locker and know that the rear d44 for a rubicon is different from other models. I have been seeing lots of threads regarding axle shafts lately and noted there are rubicon and nonrubicon shafts for the rear axle despite both being d44 and it got me wondering, if/when I need to replace or upgrade parts in the future would I need rubicon or nonrubicon parts? I am assuming all differences are directly related to the locker and second assumption would be that Jeep didn’t engineer a third rear axle for a few special additions.

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Old 07-21-2018, 12:22 AM   #2
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I am pretty sure you wouldn't have a rubi e locker in the back. (I could be wrong) but every special edition I looked at were basically just limited slips in the back, 3.73 gears and additional styling. Pm me your vin and I can review the build sheet.

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Old 07-21-2018, 12:29 AM   #3
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Worst case, if in doubt, pull a rear shaft and count the splines next time you change the rear diff gear oil.
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Old 07-21-2018, 08:04 AM
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Originally Posted by fuzzylogic_y2k View Post
I am pretty sure you wouldn't have a rubi e locker in the back. (I could be wrong) but every special edition I looked at were basically just limited slips in the back, 3.73 gears and additional styling. Pm me your vin and I can review the build sheet.
Definitely have a rear locker. I was going to include this pic so you guys don’t assune its lsd but I got distracted.
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Old 07-21-2018, 08:13 AM   #5
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Special edition with factory rear locker

Yep. OP is correct. His big bear has a rear locker as an option. (Probably the rarest of JKs)

Sources
https://cars.usnews.com/cars-trucks/...d-avail-390279

https://www.wranglerforum.com/f274/b...topics/1960874



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Old 07-21-2018, 12:13 PM   #6
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I ordered my 2016 75th Anniversary with the rear locker... it's the same Dana 44HD unit as the Rubicon but 3.73 gears...
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Old 07-21-2018, 01:38 PM   #7
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I ordered my 2016 75th Anniversary with the rear locker... it's the same Dana 44HD unit as the Rubicon but 3.73 gears...
Beyond,
Just for your info, don't know if you know it or not but, JK Rubi's came with either 3.73s or 4.10s, depending on trans type and who ordered it.
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Old 07-21-2018, 03:17 PM   #8
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Beyond,
Just for your info, don't know if you know it or not but, JK Rubi's came with either 3.73s or 4.10s, depending on trans type and who ordered it.
Scott
Ah yes... I've never seen a 3.73 Rubi in Canada... but I'm sure they are around...
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Old 07-21-2018, 09:41 PM   #9
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Definitely have a rear locker. I was going to include this pic so you guys don’t assune its lsd but I got distracted.
Wow, I stand corrected. Toss a lunchbox locker in the front and you are all set!!
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Old 07-23-2018, 02:30 PM   #10
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Wow, I stand corrected. Toss a lunchbox locker in the front and you are all set!!
While very cheap in comparison to any quality SELECTIBLE locker, a lunchbox locker will work but, the pitfalls of them are something to be considered. Primarily, once you put your Jeep in 4WD with a lunchbox locker in front, you're gonna have a rough time steering it, for every inch of any trail you're on. Since they're NOT SELECTABLE, that is, you can't turn them on or off, they're always ON, the front wheels will want to turn the same amount of revolutions in any and all situations. As you (and all of us know) that, in a turn, the inside wheel turns (rotates, not turns as in turning the steering wheel) much less than the outside wheel so, that means different speeds of rotation. Lunchbox lockers, unless you learn to MAKE them disconnect, will fight you on this. I've own a few lunchbox lockers and, it takes a bit to be able to out think them.

And second, not every inch of every trail/rut/ugly road/etc., needs for differentials to be locked. Locking a diff is for when it's REALLY NEEDED. Other than that, to run around on a locked diff when it's not needed is real tough on drive trains.

Many Jeepers cannot afford selectable lockers, no matter what type/kind they are so, lunchbox lockers is the next best thing. But, as stated, they have their issues. Sorry for the long retort but, just wanted to help folks understand some of the issues of certain lockers.
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Old 07-23-2018, 03:18 PM   #11
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Yeah I was brief on that one and lacked the disclaimer of what environments you would not want to even consider having them in. Like snow. Or any transfer case that allows full time 4wd. My cheap wheeling xj experience is showing lol.

The other issue is the power distribution when off camber. A normal locker is 50/50. Lunchbox is close to 100% to the wheel with traction and that can break a shaft.
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Old 07-25-2018, 02:33 PM   #12
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The last of the Willy’s could also be ordered with a rear locker. Nice upgrade for sure!!
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Old 07-25-2018, 06:11 PM   #13
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The last of the Willy’s could also be ordered with a rear locker. Nice upgrade for sure!!
Yes, I always found it odd how few dealers ordered that option.
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Old 07-28-2018, 12:54 PM   #14
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Yeah I was brief on that one and lacked the disclaimer of what environments you would not want to even consider having them in. Like snow. Or any transfer case that allows full time 4wd. My cheap wheeling xj experience is showing lol.

The other issue is the power distribution when off camber. A normal locker is 50/50. Lunchbox is close to 100% to the wheel with traction and that can break a shaft.
fuzzy,
ANY selectable locker, when locked, exhibits the same EXACT performance as any lunch box locker. I'm sure you know this but, locked means LOCKED, no matter what kind it is. So, to me, your description of the percentage of power to the wheels might be off just a tad. The good part about any locker, be it a lunch box or even selectable, is that, when in 4WD, and one wheel in the front has little or no traction and, the same condition exists for the rear axle, (as in highly rutted roads or trails) the wheels WITH the traction, will continued to do what they can, to propel the vehicle forward, to the point of loss of traction.

As long as there's traction, they vehicle will keep moving. And as stated way earlier, I most certainly understand the high cost of a selectable locker for sure. But, if I were setting up a jeep, and know I'll quite possibly end up in situations where a locker is highly needed, I'd bite the bullet and, spring for a selectable one.

I've never experienced an electric one, only ARBs factory TJ Rubi lockers and JK Rubi lockers. But, the setup for an aftermarket one like an E-locker, is much less complicated than setting up an air one. A switch on the dash, a wire to the diff, DONE.
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Old 07-28-2018, 01:02 PM   #15
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Originally Posted by bbortko View Post
I have a Big Bear with a factory locker and know that the rear d44 for a rubicon is different from other models. I have been seeing lots of threads regarding axle shafts lately and noted there are rubicon and nonrubicon shafts for the rear axle despite both being d44 and it got me wondering, if/when I need to replace or upgrade parts in the future would I need rubicon or nonrubicon parts? I am assuming all differences are directly related to the locker and second assumption would be that Jeep didn’t engineer a third rear axle for a few special additions.


To answer your question. It’s a Rubicon locker. So you’d need Rubicon shafts. The shafts are 32 spline. You can always check with the dealer just in case.


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Old 07-28-2018, 02:04 PM   #16
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The last of the Willy’s could also be ordered with a rear locker. Nice upgrade for sure!!
Yes, I always found it odd how few dealers ordered that option.
Correct, my Willy's w has the rear locker.
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Old 07-28-2018, 02:56 PM   #17
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fuzzy,
ANY selectable locker, when locked, exhibits the same EXACT performance as any lunch box locker. I'm sure you know this but, locked means LOCKED, no matter what kind it is. So, to me, your description of the percentage of power to the wheels might be off just a tad. The good part about any locker, be it a lunch box or even selectable, is that, when in 4WD, and one wheel in the front has little or no traction and, the same condition exists for the rear axle, (as in highly rutted roads or trails) the wheels WITH the traction, will continued to do what they can, to propel the vehicle forward, to the point of loss of traction.

As long as there's traction, they vehicle will keep moving. And as stated way earlier, I most certainly understand the high cost of a selectable locker for sure. But, if I were setting up a jeep, and know I'll quite possibly end up in situations where a locker is highly needed, I'd bite the bullet and, spring for a selectable one.

I've never experienced an electric one, only ARBs factory TJ Rubi lockers and JK Rubi lockers. But, the setup for an aftermarket one like an E-locker, is much less complicated than setting up an air one. A switch on the dash, a wire to the diff, DONE.
Scott
Sorry, you are correct and my explanation was not clear and rereading it totally missed the point I was trying to convey. Locked is locked. Allow me to try explaining this one more time.
In an off camber situation both a ratcheting and selectable locker will be applying power to an axle shaft that is carrying nearly 100% of the load for that section of the vehicle. That is the shaft of the wheel with traction(less the power to turn the wheel in the air). If the wheel in the air happens to already be spinning then the ratcheting action will kick in and there is no load to overcome. A locker forces both shafts to turn equally, that does not actually mean it splits power/force 50/50. Power/force is only applied where there is a load. You will never strip the shaft of the wheel spinning in the air.

An ratcheting locker can be installed with no shaft upgrade, ARB requires new shafts with more splines. More splines = more surface area to distribute force without stripping. With the above description and the installation requirements you would be less likely to strip the splines with an ARB setup than a ratcheting locker.

Personally, I do not care for elockers, air lockers are good. But in terms of reliability and simplicity of operation I will take a cable locker any day!!!

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