8 3/4 Third Member Source

Transmission and Drivetrain Tech

  1. 512Stroker

    512Stroker We are all here because we are not all there.

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    I am looking for a reliable supplier of a complete 8 3/4, 489 third member built up with an with a Eaton Tru-Trac, 3:23 ring and pinion.
    Thanks in advance
     
  2. 72bluNblu

    72bluNblu FABO Gold Member FABO Gold Member

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    @DoctorDiff !!!!

    I have a brand new 489 with 4.30 gears and an Eaton TrueTrac from him. The only thing I would do different is the Eaton. DoctorDiff has his own version that he calls a “sure trac” that has an extra set of helical gears compared to the truetrac, and that’s what I’d get if I had to do it again. The Eatons have had some complaints...
     
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    • kursplat

      kursplat FABO Gold Member FABO Gold Member

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      just installed mine in the valiant. need to do some burnouts next week and try it out, but so far no problems :thumbsup:
      https://www.doctordiff.com/8-3-4-helical-gear-sure-grip-sure-trac.html
       
    • 66fyssh

      66fyssh Don't Stop Believin' FABO Gold Member

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      Sounds like he's looking to buy an entire hog head all ready to bolt in.
       
    • kursplat

      kursplat FABO Gold Member FABO Gold Member

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      like i did. dr diff 3.73's with the sure trac. even comes with a gasket :)
       
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      • 512Stroker

        512Stroker We are all here because we are not all there.

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        Correct complete unit assembled
         
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        • 512Stroker

          512Stroker We are all here because we are not all there.

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          Good info
          I was not aware they were having issues. What's the problem?
          I have a Dr Diff Sure Grip now I want rid of.
           
        • stroked340

          stroked340 FABO Gold Member FABO Gold Member

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          MOSER..
           
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          • 72bluNblu

            72bluNblu FABO Gold Member FABO Gold Member

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            Exactly what I bought. Complete nodular iron 489 style case with the 4:30 gears, TrueTrac, 1350 yoke with bearings and everything assembled.

            The Eaton TrueTrac’s have had issues with vibrations and noise. Some are worse than others, but it’s a result of the 4 gear design IMO. I wasn’t convinced until I started running mine, but there is some additional gear noise from it. Cass even swapped the ring and pinion out for me because he thought it might be the R&P, but I’m pretty convinced at this point it’s the Eaton. I don’t think anything is “wrong” with it, but I would get the 6 gear version if I had it to do over.

            Why do you want rid of the Sure Grip? Other than the need for a friction modifier they’re dead simple and have a good feel.
             
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            • 512Stroker

              512Stroker We are all here because we are not all there.

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              PM inbound
               
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