1. moparsquid

    moparsquid FBBO Gold Member FBBO Gold Member

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    I would like to know what gears folks on here are running , I'm currently using a low ratio 4;30-1 gear is anyone lower I have a 5;13-1 ???
     
  2. 66Satellite47

    66Satellite47 FBBO Gold Member FBBO Gold Member

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    Depends on your driving. If a drag racing car with 31" or 32" a 5.13 might work well. But my experience is that the high rpm is really hard on parts. A 4.30 is pretty safe.
     
  3. 69 GTX

    69 GTX FBBO Gold Member FBBO Gold Member

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    For street or strip? I used to run 5.33s for 1/8 mile racing. 3.23 for street car with 727 3 speed auto. My current project will have 3.73 with gear vendor overdrive.
     
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    • moparsquid

      moparsquid FBBO Gold Member FBBO Gold Member

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      the local track is 1/8 mile my other concerns are if I run a lower gear do I need to up the stall on my converter
       
    • 69 GTX

      69 GTX FBBO Gold Member FBBO Gold Member

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      Depends on your cam.
       
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      • moparsquid

        moparsquid FBBO Gold Member FBBO Gold Member

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        580 solid
         
      • dvw

        dvw Well-Known Member

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        More gear can lower the flash stall slightly. It also may induce tire spin. As long as the finish line RPM is in range once it's sorted out it will be quicker with more gear. However depending on the combo the pick up can be a little, or a lot. The more the torque, the lighter the car, the less the gain.
        Doug
         
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        • biomedtechguy

          biomedtechguy Accelerati Rapidus Maximus FBBO Gold Member

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          Went from a 3.54 to a 4.10 when I installed my Passon Performance 5 speed. I was worried about making it through the 1/4 mile in 4th. It makes it in the one full run I've done since I put in the 4.10. 17" wheels, appx tire diameter is 25.6"
           
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