Basic Eaton Posi question

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    Author Topic: Basic Eaton Posi question  (Read 3707 times)

    Offline TinCuda

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    Basic Eaton Posi question
    « on: August 31, 2012 - 01:09:27 AM »
    I have been looking into installing a posi in my 'cuda.  Correct me if this is wrong.

    The Eaton Detroit Locker spins both tires and has clutches to let one tire spin faster while going around a corner.

    The Eaton Trutrac switches power from one tire to the other as needed.

    What does the Auburn do?

    Was the SureGrip an Auburn?

    Which one do you guys prefer?

    This will be used for street cruises and occasional street light romps.

    I am not all that concerned about rebuildability.  I doubt that I will wear out a set of tires anytime soon, let alone a rear end.


    .,
    « Last Edit: August 31, 2012 - 01:58:33 AM by TinCuda »
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    Offline Chryco Psycho

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    Re: Basic Eaton Posi question
    « Reply #1 on: August 31, 2012 - 12:42:05 PM »
    Trutrac is the best , simply genius they use a worm gear so the gear angle lock with power & unlocks with axle feed so it is never sticky in corners & always lock with power , it also uses no clutches so there is nothing to wear out .
    Lockers are notchy , old tech
     Sure grips came in 2 varieties
     Cone & clutch
     Auburn is a cone , as the cone wears it eventually bottoms out bcoming ineffective
     clutch type are far stronger & have replacable clutches on both sides
     Both have to overcome the grip to corner
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    Offline TinCuda

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    Re: Basic Eaton Posi question
    « Reply #2 on: August 31, 2012 - 02:48:19 PM »
    Quote from: Chryco Psycho on August 31, 2012 - 12:42:05 PM
    Trutrac is the best , simply genius they use a worm gear so the gear angle lock with power & unlocks with axle feed so it is never sticky in corners & always lock with power , it also uses no clutches so there is nothing to wear out .
    Lockers are notchy , old tech
     Sure grips came in 2 varieties
     Cone & clutch
     Auburn is a cone , as the cone wears it eventually bottoms out bcoming ineffective
     clutch type are far stronger & have replacable clutches on both sides
     Both have to overcome the grip to corner

    Thanks again Neil!


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    Offline Chryco Psycho

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    Re: Basic Eaton Posi question
    « Reply #3 on: August 31, 2012 - 08:17:00 PM »
     :2thumbs:
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    Offline torredcuda

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    Re: Basic Eaton Posi question
    « Reply #4 on: October 23, 2012 - 09:10:22 AM »
    I am looking at getting a Trutrac also.I heard the locker is too hrash for street use for most guys.
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    Jeff
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    Offline b-bak73

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    Re: Basic Eaton Posi question
    « Reply #5 on: November 06, 2012 - 03:21:53 PM »
    i fitted a trutrac to my challenger and its great,smooth and quiet,some people will tell you that you have to change to the green type axle bearings with this unit ,but this untrue as the trutrac comes with a spacer to set axle backlash. :working:
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    Offline brads70

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    Re: Basic Eaton Posi question
    « Reply #6 on: November 06, 2012 - 10:34:01 PM »
    I ordered a trutrac in my new Dana . Seems great . I'm impressed on how straight it goes even when the tires are spinning!
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    Offline MetalMilitiaSRT

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    Re: Basic Eaton Posi question
    « Reply #7 on: November 07, 2012 - 01:52:36 PM »
    I recently got a new limited slip differential for my SRT-6 and now need one for the Challenger. Choosing the one for the SRT was easy, there is only 1. With the challenger, there are a few different part numbers available, a 30-spline & a 33-spline.  How do I find out which one I need? Do I get one based off my rear end (8¾) & ratio (3.23)? Or do I need other info like carrier numbers, etc...?
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    Offline BS CUDA

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    Re: Basic Eaton Posi question
    « Reply #8 on: November 07, 2012 - 09:25:49 PM »
    Quote from: MetalMilitiaSRT on November 07, 2012 - 01:52:36 PM
    I recently got a new limited slip differential for my SRT-6 and now need one for the Challenger. Choosing the one for the SRT was easy, there is only 1. With the challenger, there are a few different part numbers available, a 30-spline & a 33-spline.  How do I find out which one I need? Do I get one based off my rear end (8¾) & ratio (3.23)? Or do I need other info like carrier numbers, etc...?

    Stock differential will be 30 spline. The Auburn, True Trac and Eaton LSD fit all 8 3/4 carriers. Quite a few members here like the True Trac - I run the Auburn and love it but may also try a True Trac in the future. I sell them all and they are all great units - slight differences with them all including construction and operation.
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    Offline MetalMilitiaSRT

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    Re: Basic Eaton Posi question
    « Reply #9 on: November 08, 2012 - 04:05:15 PM »
    Quote from: BS CUDA on November 07, 2012 - 09:25:49 PM
    Stock differential will be 30 spline. The Auburn, True Trac and Eaton LSD fit all 8 3/4 carriers. Quite a few members here like the True Trac - I run the Auburn and love it but may also try a True Trac in the future. I sell them all and they are all great units - slight differences with them all including construction and operation.

    Pardon my ignorance, but where does the 33 spline come into play? Can I find out without opening the diff? The engine is not original to the car so there is a slight chance the rest of the drivetrain is not either.

    You sell them, huh. You may be hearing from me soon...  ;)
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    Offline BS CUDA

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    Re: Basic Eaton Posi question
    « Reply #10 on: November 08, 2012 - 09:23:11 PM »
    Quote from: MetalMilitiaSRT on November 08, 2012 - 04:05:15 PM
    Pardon my ignorance, but where does the 33 spline come into play? Can I find out without opening the diff? The engine is not original to the car so there is a slight chance the rest of the drivetrain is not either.

    You sell them, huh. You may be hearing from me soon...  ;)
    33 spline will require custom axles built - like Moser or Strange. Very unlikely you would have them although I have been wrong before. You will have to pull an axle shaft and count the splines to find out. I am in Canada so shipping would probably kill the deal  :bigsmile:. Jegs and Summit price them well. I have no problem answering questions  and I have been known to share a few opinions.
    « Last Edit: November 08, 2012 - 09:26:24 PM by BS CUDA »
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    Offline MetalMilitiaSRT

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    Re: Basic Eaton Posi question
    « Reply #11 on: November 09, 2012 - 11:45:32 AM »
    Quote from: BS CUDA on November 08, 2012 - 09:23:11 PM
    33 spline will require custom axles built - like Moser or Strange. Very unlikely you would have them although I have been wrong before. You will have to pull an axle shaft and count the splines to find out. I am in Canada so shipping would probably kill the deal  :bigsmile:. Jegs and Summit price them well. I have no problem answering questions  and I have been known to share a few opinions.

    Cool! Thanks for the info. I'm considering the purchase of some new 3-piece forged race wheels, 9 or 9.5" on the rear and I'll want the diff to supplement the added traction. :)
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    Offline shadango

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    Re: Basic Eaton Posi question
    « Reply #12 on: November 26, 2012 - 01:52:15 PM »
    I got my TruTrac setup when I bought my 3.55 rear chunk....

    I have had a few (modern) vehicles with posi/sure grip...got it from Dr Diff  (AWESOME vendor by the way!!!!!) .....and the difference is noticeable to me.....the tires "stick" much better when taking off, even in conditions where traction is uneven left to right.....

    Hard for me to describe.  Just feels "different".  I like it.

    My smallblock is not pumping out gobs of torque, so burnouts are not all that common, but when I do them, the rear end locks up and GRABS quickly when I want it to......it will still "fishtail" some though......just a little.

    I cant speak to how it will handle under large HP use.....
    « Last Edit: November 26, 2012 - 01:57:45 PM by shadango »
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