Sure Grip unit feels much better than Eaton TruTrac did..

Transmission and Drivetrain Tech

  1. DoctorDiff

    DoctorDiff Well-Known Member

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    I built Jbc426's True Trac equipped third-member (among approx 100 others) about 5 years ago. At that time, I did not hear any complaints from my customers. See below:

    Eaton Truetrac noise? Doctor Diff? | Moparts Question and Answer | Moparts Forums

    In 2015 I started hearing complaints from a few customers regarding noise associated with the units. See below:

    truetrac noise, finally found it, not sure I can fix it!

    Even though the problem was hit-or-miss, I quit selling True-Tracs for over a year UNTIL that production run was depleated. I recently re-listed True-Tracs because I haven't heard any complaints with the latest production run.

    Again, the problem was a crap-shoot. Read all the reviews on Summit, below:

    Eaton Detroit Truetrac Differentials TT70P52790

    The issue was not exclusive to Mopar 8.75" rears. Quality control on the Ford 8.8" version also suffered.

    BTW, I 'm about to release my own version of the 8.75" True-Trac.
     
    Last edited: Feb 1, 2018
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    • MRGTX

      MRGTX Well-Known Member

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      This is great to hear...and your endorsement is worth a lot in my estimation.

      I think we're lucky in the Mopar world. While we have fewer choices and more expensive parts than the Chevy and Ford guys, the vendors who specialize in Mopar stuff seem to be the good ones.
       
    • MRGTX

      MRGTX Well-Known Member

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      It means a lot that you came here to clarify. Thank you.

      How were you able to identify the affected production run? Is there a serial number range?
       
    • moparmat2000

      moparmat2000 FABO Gold Member FABO Gold Member

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      I think the reason that theres more "good guys" in the Mopar realm is that its such a smaller righter knit community , that bad word gets around a lot quicker to more of your customer base, then you lose most of your business.

      I have had dealings with Cass and everything was great. Bought all my 3rd member parts from him. Gears, bearings, clutch type sure grip, axles w green bearings etc. Everything was as advertised, packed well and shipped in timely manner. I cant ask for much more than that.

      The fact that he is trying to address the problem with faulty units is a testament to his good character. Plus he is coming out with his own true trac type limited slip which will likely be better than the Eaton one.

      Jamie Passon is the same way with the 4 speed transmissions. He saw a need for a direct bolt in 5 speed that fits in place of a 4 speed with NO floor, bellhousing, driveshaft, or crossmember modifications. And named it the A-855. It looks like an evolution of the A-833, and is unbreakable.
       
    • autoxcuda

      autoxcuda Well-Known Member

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      I don't run a true trac. I've got an OE clutch in my Barracuda.

      A Tru Trac WAS on my wish list. That might have just changed.
       
    • 72bluNblu

      72bluNblu FABO Gold Member FABO Gold Member

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      My mistake! I thought you’d already gotten one.
       
    • autoxcuda

      autoxcuda Well-Known Member

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      I heard rumors Cass was considering a 8 3/4 aluminum case. That MP price is rediculous.
       
    • 72bluNblu

      72bluNblu FABO Gold Member FABO Gold Member

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      It would be a great idea if he could put a dent in the Mopar Performance price and still make some money. The MP prices are getting totally out of hand on everything. An aluminum case 3rd member is one of those things I want every time I see one, until I talk myself back to reality. As in, I totally don't need that. I mean, maybe if I were competing or something I might be able to figure out some kind of advantage for the weight loss. But for what I do with my car I've already gone above and beyond what it needs to be for my capabilities.

      Same thing any time I see a Dart Lite or Feather Duster trunk lid. Every time I see one I want one. But then people want a few hundred bucks for one (which isn't completely insane), and then shipping costs a hundred bucks because they're never anywhere near me. And finally I talk myself into how the trunk lid being a few pounds lighter will have no real effect on anything except my wallet and the setting on my trunk torsion springs.

      Great stuff for the "cool" factor, but for it to be actually useful you'd need to be running against a stopwatch and be competitive about it.
       
    • DoctorDiff

      DoctorDiff Well-Known Member

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      I also have an aluminum 489 case in the works.
       
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      • autoxcuda

        autoxcuda Well-Known Member

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        :lol:

        :thankyou:
         
      • gold66cuda

        gold66cuda Well-Known Member

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        I have a 4:30 TruTrac that I purchased from Cass about 5 years ago, works flawless. Sounds like I'm going to be looking into the new lighter unit now. If the aluminum one Cass is developing is at least 20% less than the Mopar ones I would think there will be a market for them. If Cass is involved it will be top quality for sure. Sign me up for one!
         
      • Marcohotrod

        Marcohotrod Well-Known Member

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        what do we like for rear gear lube? conventional, semi synthetic, full synthetic? I run walmart 80-90 semi
         
      • fratzog lover

        fratzog lover Well-Known Member

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        The G80 auto locker stopped locking in my 06 Sierra, so I just had an Eaton Truetrac installed. My initial impressions are very good (but very limited at this moment). It seems very smooth and both wheels hook up when needed.

        I read through this earlier thread regarding fluid recommendations. Though the thread is somewhat old, the recommendations are still valid for the most part.

        Here's what Eaton says today in the documents currently on their website:

        Detroit Truetrac
        A quality petroleum (mineral) based oil is recommended. Synthetic oils and friction modifiers should not be used, as they will decrease overall performance.

        Detroit Truetrac®
        What kind of oil should I use? Can I use synthetic?
        Do I need friction additive/modifier?
        Truetrac units perform best when using GL5 mineral /
        petroleum based gear oil. Synthetic lubes are
        discouraged. Do NOT use friction modifier additives or
        lubes formulated with friction modifiers. See the
        “Lubrication” section of this product manual for further
        details and specifications.

        Lubrication Specifications
        Detroit Truetrac®
        High quality mineral or synthetic gear lubes are
        required for use in Detroit Truetrac differentials.
        Regardless of the lube type, always use a GL5 rated
        lube with the least amount of friction modifier. Mineral
        lubes lacking friction modifiers (limited-slip additives)
        were historically recommended for all Truetrac
        applications because friction modifiers can slightly
        reduce the bias ratio (limited-slip aggressiveness) of
        Truetrac differentials. However, to address the
        continually increasing power outputs of modern
        powertrains, many vehicle manufacturers have
        switched to synthetic lubricants as a counter measure
        for increased axle temperatures and prolonged service
        intervals. In general, consult the vehicle owner's
        manual for the manufacturer's recommendations for
        lubrication type, weight and fill volume. This will ensure
        lube compatibility with the seal materials and bearings
        used in the axle. Eaton Performance technical support
        is available for any concerns in lube selection.

        I was told that mine was filled with Mobil 1 when they did the install. I'm planning an oil change in a month or so, and I plan to install a conventional mineral oil without limited slip additive at that time. Unfortunately it appears most of the "majors" now include LS additives in all of their gear oils now. It appears that many of the "store brand" gear oils still lack the LS additive, so I'll probably choose one from among them.

        Top
        book.gif Re: Eaton Gear Oil Recommendations for the Truetrac [Re: Brian Barnhart]
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        Registered: 10/04/07
        Posts: 1606
        Loc: Oahu, Hawaii
        It's probably saying syn is not recommended because most of them come with an LS additive that can affect the performance of the truetrac. There are a couple of syn gear oils without the LS additive such as Redline 75W90NS or Eneos 75W90.

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        • Mrpatel

          Mrpatel 512Dart

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          When I purchased my truetrac, I called them about the limited slip additive and told them I had put valvoline gear oil in. They told me that I needed to drain the valvoline out and use Lucas oil (no additive) or Shell in order to avoid any issues. I followed their recommendations and all seams good & would build another one if needed. Andrew
           
        • MRGTX

          MRGTX Well-Known Member

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          So here's a thing.

          First, I have a few hundred miles on the TrueTrac now. There seems to be a minor vibration going on but I also changed the whole suspension and driveshaft at the same time and I'll be sorting things out on that for a while yet...not ready to blame the Truetrac yet. Plus, I have yet to go over 70mph or so...so who knows.

          What I have noticed is that when turning right, I hear a scraping noise coming from the right rear. There's no noticeable noise from either side when turning left. I checked to make sure that the pads (disk brakes) weren't floating around, made sure everything was tight, it all looked ok. The noise has gradually become somewhat less pronounced but it's still there.

          Any guesses?
           
        • A408Cuda

          A408Cuda Well-Known Member

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          Can anybody tell me if the Trutrac's are all good now? I was getting ready to buy one and came across this thread. I run a narrowed 8 3/4" with green bearings.
           
        • Mrpatel

          Mrpatel 512Dart

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          Mine is fine. They only want you to use Lucas oil. Andrew
           
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          • A408Cuda

            A408Cuda Well-Known Member

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            Update, I emailed Dr. diff with my set up and asked for recommendations. Cass got back to me right away.
            He said the Tru trac is still hit and miss and he recommended the Sure-Trac. I ordered it this morning
            Thanks Cass!
             
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