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Thread: Lockers??

  1. #1
    Chiks=Trouble XJ=:) CrewDawg15/22's Avatar
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    USAF Lockers??

    As you all know I'm pretty new to Jeep's and Wheeling. I have yet to get the XJ out seeing how I have to replace the engine. I see you guys/gals talking about lockers so Im going to go ahead and ask WHAT ARE THEY?? Where do they go and what are they for? I figure I better start learning so I heve some idea as to what I need to do and figure out before I do the trial and error. This way my "error" wont be as costly.
    "If it Turns, Burns, Banks, and Rolls Crew Chiefs made it do it."

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    Administrator korisu56's Avatar
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    Definition on 4wd.com:

    A locking differential or locker is a variation on the standard automotive differential. It provides increased traction compared to a standard, or "open" differential by disallowing wheel speed differentiation between two wheels on the same axle under certain conditions. A locking differential is designed to overcome the chief limitation of a standard open differential by essentially "locking" both wheels on an axle together as if on a common shaft while still allowing them to rotate at different speeds when it is required.

    My terms:

    It makes both wheels spin equally when engaged. When open, wheels like the path of least resistance. These make both suckers work full time.

  3. #3
    Land Squid Jeffb_79's Avatar
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    Lockers are devices that lock up the axles to force both tires on that axle to turn at the same time, thereby giving you twice the traction of a normal differential.

    There's different types...
    Auto: detroit
    Manual: arb, ox

    Manuals are nice since you can shut them off when you're on the street and turn them on when you need them off road. They're expensive.
    Autos work great off road, but can bring down your streetability. They're quite a bit cheaper.

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    Senior Member HillBillE's Avatar
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    Lockers are 'traction aids', a device that 'locks' the left and right axle shafts, so both tires turn, even if one tire has no traction (ie: in the air)

    They install inside the differential, (the big round thing in the middle of the axle, also refered to as a 'pumpkin' or a 'pig')

    There are different types of lockers:

    Automatic- like Aussie, Lock-Rite

    And selectable, like:
    Electronic- Auburn E-locker

    Pnuematic- ARB

    Manual (cable) - OX

    The prices vary, and what you need will depend on your wheeling style, whether the rig is also a DD or strictly a trail rig, etc.

    Some factory axles have lockers, like the Jeep 'Rubicon'

    Some have 'posi-traction' or 'trac-loc', this is a series of plates/discs, that 'bind' together when one wheel spins faster than the other, helping divert power to the wheel with more traction.

    Most vehicles have 'Open' differentials, where the power from the driveshaft turns the carrier, and inside the carrier are 'spider gears'.

    The spider gears allow the vehicle to turn smoothly, becuase they 'diiferentiate' the applied power, and allow the axle on the outside to turn faster than the axle on the inside.

    Nice for a trip to the mall, not so nice in the mud

    The problem with an 'open' diff, is when one tire has little or no traction, thats where the power goes. So if you have a tire in the air, it will spin, while the tire on the ground, will not.

    A locker will force power to both wheels, thereby giving you greater traction.

    Hope this helps! HB


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    Senior Member HillBillE's Avatar
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    Here's a 'carrier' (goes inside the differential) that has an automatic locker installed (this is what's called a 'lunchbox' locker-becuase it uses the factory carrier, some lockers replace the entire carrier)

    The locker is the part inside:



    Here is the carrier and locker (with ring gear) installed in the differential: (the round shaft sticking out is not normal it's what can break using to much throttle):



    As long as the people remain armed,
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  6. #6
    Junior Member rollerpig82's Avatar
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    How effective it a limited slip diff. like the trac loc for example?

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    Quote Originally Posted by rollerpig82 View Post
    How effective it a limited slip diff. like the trac loc for example?
    It all depends on terrain, pavement, etc. The main word in your question is 'Limited'. If you hit a few easy to moderate trails once or twice a year, then a LS should do you fine (sometimes if you get to much wheel spin from a 'hanging' tire, you lightly apply the brakes to fool the LS, and the tire with traction should/will start to rotate). If you hit the trails two to three times a month, I would suggest a locker (of some type at least in the rear).

    LS will help on wet pavement, for the most part.

    Lockers will give the vehicle different handling traits. Some like the difference, and get used to the change in traction, saying that they even forget that a locker was installed. Others do not like the change of attitude in their Jeep, and have them removed.

    Lots of offroaders swear by the Detroit Trac-loc for the front axle with a Detroit soft-locker in the rear.

    I also hear it's not a 4X4 until you lock'em all!

    I hope that helped.

    Later, T.J.

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    Member Marinedawg's Avatar
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    I have selectable lockers. Ox Lockers. Absolutely love them. All your decision and choice. Research research research.
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    The Cow Shall Rise Again theyeti1775's Avatar
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    And do not lock a Dana 35 Rear. Can't believe no one mentioned that since he has a XJ.

    Really though put a selectable locker in your front Dana 30 and you will love it off road and on.
    Yeti

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  10. #10
    Access Army Times Editor Navy-Jeepster's Avatar
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    Quote Originally Posted by theyeti1775 View Post
    And do not lock a Dana 35 Rear. Can't believe no one mentioned that since he has a XJ.
    I would ask why?
    I know they say it is very weak, but one of the guys I wheel with has a super 35 kit in his, and has never broke anything in it.
    And he runs the Hammer trails at least 3 times a year.

    If you can stay off the skinny peddle and keep the tires on the ground at all times, then you will not break things.
    When you get wheel hop and lots of tire spin, things go boom quickly.

    I am about ready to install ARB's front and rear in my stock axles. I will upgrade the axle shafts also during the install.

    Todd
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