8 3/4 diff. ID. And ratio question

Transmission and Drivetrain Tech

  1. A Body 440 WHY NOT

    A Body 440 WHY NOT Well-Known Member

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    Hello all,
    So I pulled out the center section, (489 ) and counted the teeth . It has 9 on the pinion and 43 on the ring. Sounds crazy high. Like 478-1. Diff is in fantastic shape and spins like velvet. Has the springs/post unit. Should I change out the gears, or try to trade it ? I am looking for 355 or 323. Haven't fully decided due to the fact that I haven't picked out wheels n tires yet. I am building a 69 dart with a fresh 440 /727 combo. BIG project.
    Thanks.
     
  2. toolmanmike

    toolmanmike FABO Staff Staff Member FABO Gold Member

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    Count again? 4.56 4.88? Never heard of a 4.78 44 teeth on the ring gear will give you a 4.88 and that's probably what you have. It would be easier to sell/trade your chunk for a 2.23 or 3.55 unit. Somebody would like your steep gear.
     
  3. fishy68

    fishy68 Tyr Fryr's Inc. FABO Gold Member

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    If you haven't set up gears before I can tell you their not easy to get right for a newbie. You need some specialized tools too. Sell it or trade it for what you want
     
  4. Demonracer

    Demonracer 71 Demon 00 Ram 16 Chrysler 300S 05 Caravan FABO Gold Member

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    As fishy68 said if you are not familiar with changing out gears, trade it off, or have a professional change them for you. If you change them out yourself, you are probably going to end up with a non serviceable chunk that is better suited for a door stop.
     
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    • A Body 440 WHY NOT

      A Body 440 WHY NOT Well-Known Member

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      I have set up gears before. Prob missed the count by 1. Looks like 488 gears, posi unit. I will place an ad to trade . Thanks
       
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