A727 Torqueflite planetary question (for gurus only lol)

Engine, Trans & Driveline

  1. Lefty71

    Lefty71 FBBO Gold Member FBBO Gold Member

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    Just a point of curiousity, since I know they are'nt a high failure item anyway, but;

    Has anyone ever stacked up rear planetaries from a 70's 727 to compare with the newer four or six pinion planetaries from a later model, like a 46-7RHE or an 48RHE??? Are there physical size, width differences??

    TIA, Lefty71
     
  2. 1 Wild R/T

    1 Wild R/T FBBO Gold Member FBBO Gold Member

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    They have been swapped in before... I don't know the specifics but I know it's been done... I don't have a need, never really had any issues with the three or four pinion units so I haven't really bothered too look.. But I have talked to a buddy that builds trannies all day every day so I know it's doable...
     
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    • 493 Mike

      493 Mike FBBO Gold Member FBBO Gold Member

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      Output shaft front planet splines differ.
      1962-1975 are interchangeable.
      1976-1993 are interchangeable.
      1994 and newer are interchangeable.
      Beware also of planet gear pitch as they also vary.
      Keep thrust washers as well as all other components within their year grouping.
      Mike
       
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      • Lefty71

        Lefty71 FBBO Gold Member FBBO Gold Member

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        Now, this might be the problem.... My thinking was, "keep the rear ring gear with the appropriate vintage output shaft to avoid spline angle issues"...... but then I was wanting to mix and match the rear planetary itself into that particular ring gear, but if the gear pitch itself is indeed different, then no-go..... Thx for your insight.
         
      • oldkimmer

        oldkimmer FBBO Gold Member FBBO Gold Member

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        The rear planet doesn’t fit on the splines. This has been answered on FABO. Kim
         
      • Lefty71

        Lefty71 FBBO Gold Member FBBO Gold Member

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        Thank you Kim, Lefty71
         
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