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  1. #1
    JK Super Freak Freewill's Avatar
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    Default Is Trac-Loc A TORSEN Design?

    Like the subject says, does anyone know if Trac-Loc is a TORSEN design limited slip?

    Thanks
    '11 JK Sport hardtop auto, 4.56, air lockers
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  2. #2
    JK Enthusiast c17loadmaster's Avatar
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    The trac loc is a clutch pack style designed by Detroit. The clutch pack is replaceable but you gotta have a pro disassemble it.
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  3. #3
    JK Freak Zombie Hunter's Avatar
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    Don't take this as fact, but I think Torsen uses gears to manage slip and Trac-Loc uses clutches.



    There are currently three types of Torsen differentials.

    1.The original Torsen T-1 (Type A) uses crossed axis helical gears to increase internal friction. The Type I can be designed for higher torque bias ratios than the Type II, but typically has higher backlash and the potential for Noise, Vibration, and Harshness (NVH) issues, and requires a precise setup/installation.
    2.The later Torsen T-2 (Type B) uses a parallel gear arrangement to achieve a similar effect. There is also a specialist application of the T-2, known as the T-2R (RaceMaster).
    3.The latest Torsen T-3 (Type C) is a planetary type differential, in that the nominal torque split is not 50:50. The Type C is available as single or twin version; the Torsen twin C differential has front and center differential in the same unit.



    And a note about Trac-Lok from JP Magazine: ht tp://www.jpmagazine.com/techarticles/drivetrain/154_0910_jeep_locker_overview/viewall.html


    Trac-Lok
    Overview: The Trac-Lok is the OEM limited slip differential offered in many vehicles-from early CJs from the mid-'70s up through XJs and some TJs. It uses stacks of friction discs that hold the spider gears from differentiating until enough torque is generated by the shafts to let them spin.

    Street:
    You'll think you're driving an open diff. The Trac-Lok is largely unnoticeable.

    Off-road:
    You'll think you're driving an open diff. The Trac-Lok is largely unnoticeable. Unless it's new from the factory, don't expect anything but poor performance off-road from a Trac-Lok.

    Good: It probably came in your Jeep from the factory. The unit can be rebuilt at home.

    Bad: They require gear oil with a friction modifier and have wearable clutches inside. If you're planning on adding a lunchbox locker, you'll need to order a special application that will work with the clutch disc recess in the case. The recess inside of the case makes it slightly weaker than a standard open diff case. It's difficult to weld into a spool if that's your thing. Basically, they don't work well, so don't waste your money. You're better off with an open diff.
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  4. #4
    JK Super Freak Freewill's Avatar
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    Quote Originally Posted by Zombie Hunter View Post
    Don't take this as fact, but I think Torsen uses gears to manage slip and Trac-Loc uses clutches.



    There are currently three types of Torsen differentials.

    1.The original Torsen T-1 (Type A) uses crossed axis helical gears to increase internal friction. The Type I can be designed for higher torque bias ratios than the Type II, but typically has higher backlash and the potential for Noise, Vibration, and Harshness (NVH) issues, and requires a precise setup/installation.
    2.The later Torsen T-2 (Type B) uses a parallel gear arrangement to achieve a similar effect. There is also a specialist application of the T-2, known as the T-2R (RaceMaster).
    3.The latest Torsen T-3 (Type C) is a planetary type differential, in that the nominal torque split is not 50:50. The Type C is available as single or twin version; the Torsen twin C differential has front and center differential in the same unit.



    And a note about Trac-Lok from JP Magazine: ht tp://www.jpmagazine.com/techarticles/drivetrain/154_0910_jeep_locker_overview/viewall.html


    Trac-Lok
    Overview: The Trac-Lok is the OEM limited slip differential offered in many vehicles-from early CJs from the mid-'70s up through XJs and some TJs. It uses stacks of friction discs that hold the spider gears from differentiating until enough torque is generated by the shafts to let them spin.

    Street:
    You'll think you're driving an open diff. The Trac-Lok is largely unnoticeable.

    Off-road:
    You'll think you're driving an open diff. The Trac-Lok is largely unnoticeable. Unless it's new from the factory, don't expect anything but poor performance off-road from a Trac-Lok.

    Good: It probably came in your Jeep from the factory. The unit can be rebuilt at home.

    Bad: They require gear oil with a friction modifier and have wearable clutches inside. If you're planning on adding a lunchbox locker, you'll need to order a special application that will work with the clutch disc recess in the case. The recess inside of the case makes it slightly weaker than a standard open diff case. It's difficult to weld into a spool if that's your thing. Basically, they don't work well, so don't waste your money. You're better off with an open diff.
    Thanks for the great reply

    Mine came with Trac-Loc and it has worked well in the loose stuff so far (7000 mi.) Based on my experience with other friction-disc limited slip setups, this one is likely to stay in there only until it begins to fail, then I'll deal with whatever it takes change to a locker.
    '11 JK Sport hardtop auto, 4.56, air lockers
    2.5" spring lift, 32 MT rubber
    Bumper & winch & some other stuff

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