Installing Eaton true trac

Discussion in 'Differential & Driveline' started by GMFORLIFE, Mar 27, 2018.

  1. GMFORLIFE

    GMFORLIFE Full Access Member

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  2. gpmorgan

    gpmorgan Full Access Member

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    I see he was wrong about the factory shims. I've done two of these rear ends and used the factory shims on both and had a lot better looking gear pattern than that.
     
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  3. GMFORLIFE

    GMFORLIFE Full Access Member

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  4. gpmorgan

    gpmorgan Full Access Member

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    I used the tru-trac with the clutches in the ones I did. Both were 10 bolt. I'm really pleased with the way they work.
     
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  5. 87scotty

    87scotty Full Access Member

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    So of one wheels in the air it does give power to the one on the ground correct
     
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  6. 77 K20

    77 K20 Full Access Member

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    No- it doesn't lock completely. There needs to be some traction on a tire before it can transfer it to the other. (anything times zero is still zero).

    However- a light application of your brakes will give the tire in the air "traction" and will cause the other tire on the ground to turn.
     
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  7. 77 K20

    77 K20 Full Access Member

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    This shows brake modulation with a truetrac
     
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  8. rpcraft

    rpcraft Full Access Member

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    So, pardon my lack of knowledge on the lockup specifics, does something like a G80 lock in the same manner with brake modulation?
     
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  9. 77 K20

    77 K20 Full Access Member

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    The G80 has to have one tire spin faster than the other before it "catches" and then will lock them together. So there is no advantage to using your brakes. I've had 3 of them so far- one in a ZR2, one in a GMC Typhoon (I think anyway), and one in my Silverado.
    In the ZR2 I used it quite a bit offroad. In theory it was supposed to engage once one tire does 100 RPM more than the other. There was a few times when it was stuck and leaning heavily to the side where that wheel spin RPM seemed to be a lot higher. And then it engaged with some violence. But it never broke.

    They do all right although some hate them. They can shatter/explode if you have horrible luck/or are a dumbass.

    Here is an old video- but with squares that shows a bit about them.

     
    Last edited: Mar 29, 2018
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  10. 87scotty

    87scotty Full Access Member

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    Neat that's probably better up front and a real locker in the back
     
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  11. 77 K20

    77 K20 Full Access Member

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    That is the setup I have. True trac up front, Detroit locker in the back. There is only once where I had to use the brakes to stop a front tire from spinning and force it to send power to the other tire. Although this wasn't too long after I bought it. They claim that eventhough there isn't a "break in" period after a while the gears wear into their pockets a bit better and performance will improve slightly.

    This was where I had issues:

    [​IMG]

    Doesn't look like much going down it. But on the return trip it was raining heavily. Rocks were wet/slick. There is a series of stair steps coming up out of it. That bottom step is 16"-17" or so. Couldn't get the back tires up over it. One of my front tires was on top of a large wet slick rock and spun while the other tire in some mud just sat there. After a few angles and then using the brakes I made it up.
     
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  12. GMFORLIFE

    GMFORLIFE Full Access Member

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  13. 78c10bigten

    78c10bigten Full Access Member

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    Well now aint that sumpin!! I always wondered why it was called a FF. I like the way you can swap axles in no time at all! Ima just learnded sumfin!!
     
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