489 diff question

Engine, Trans & Driveline

  1. BAFRAID

    BAFRAID She getting closer. FBBO Gold Member

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    6FC35221-E874-40AA-A1F0-6B4474A54E61.jpeg I’m getting ready to purchase a new third member for my 1969 Super Bee automatic with a 383. I’m ordering through Dr. Diff and I’m at the differential section. I’m not sure which of these I’m supposed to pick. I want a sure grip. I’m thinking the choice would be the 6 helical sure trac 2?
    Advice please. I have been emailing him as it sounds like he is super busy and not able to take phone calls currently.
     
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    • Sahara

      Sahara FBBO Gold Member FBBO Gold Member

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      Personally I wouldn’t use a spool on the street. With a spool you essentially have a solid axel with no differential.
       
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      • BAFRAID

        BAFRAID She getting closer. FBBO Gold Member

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        What would I choose instead?
         
      • Sahara

        Sahara FBBO Gold Member FBBO Gold Member

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        The first one of the three choices shown.
         
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        • Sahara

          Sahara FBBO Gold Member FBBO Gold Member

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          The spool is cheaper in this instance because there is nothing to it; essentially just a solid steel collar that joins both axels together. The sure trac is quite a bit more complicated to make, thus more expensive. I personally have no personal experience with that exact unit, I just know that you need some sort of limited slip differential rather then a spool.
           
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          • Sahara

            Sahara FBBO Gold Member FBBO Gold Member

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            Dr. Diff is awesome in their awesomeness, by the way. I got my 489 case rebuild kit there. Many of the guys on this site buy there.
             
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            • 65-440

              65-440 Well-Known Member

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              Truetrac for sure, I won't run anything else unless I need a locker..... screw clutches! Truetrac and plain Jane 80w90 gear oil, done!
               
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              • 451Mopar

                451Mopar Well-Known Member

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                That looks like options to the base configuration? What differential comes standard? Maybe the maybe the clutch type powr-loc ?
                I would call to see what options there are. On a street car you don't want a spool, but some type of limited slip or the sure-track?
                The helical Sure track can have different torque bias ratios built in. I'm curious what the torque bias ratio of the Dr. Diff Sure-Track is.
                 
              • 65-440

                65-440 Well-Known Member

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                Pretty sure he doesn't do his own truetracs, just sells the Detroit units....at least that's how it was when I bought one of mine through him.
                 
              • justcruisin

                justcruisin Well-Known Member

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                Dr Diff sure-trac is his own unit that he has built in bulk lots. Helical gear, but not the same as the truetrac.
                 
              • 65-440

                65-440 Well-Known Member

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                Just looked it up, that's pretty cool. Might have to try it out on my next diff build!
                 
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