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Thread: Can anyone tell me what rear end gears i need!!

  1. #1
    Junior Member APPRENTICE
    Join Date
    Mar 2010
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    22

    Can anyone tell me what rear end gears i need!!

    I just built a 383 stroker and have it in a 67 camaro. 10.25 ratio. it has a turbo 400 transmission. Just ran the qtr with it today and topped out around 105 before i got to the end. So I need lower gears but not sure what to go with. 3.73's? 3.55's?

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
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    4,143
    How high are you wanting to rev the engine? Where does the engine make power at? How heavy is the car? How tall are your tires?

    I would run a 4.10 or 4.56 or something in the middle like a 4.30. Depending on the answers to above questions.

  3. #3
    Senior Member RACING JUNKIE
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    Sep 2007
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    orland pk il
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    all above that tod said . also what is the primary use of the car , strip only ? street & strip ? what stall ?
    MIKE

  4. #4
    Senior Member RACING JUNKIE
    Join Date
    Dec 2008
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    Sugar Hill, GA
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    You also need to indicate what gear you have in it now. Dave
    Dave
    http://www.racingjunk.com/profile/343797
    "All that is necessary for the triump of evil is for good men to do nothing" Edmund Burke

  5. #5
    There are 2-3 sites that have the rear end gear ratio calculaters. I am at work and can't post them at the moment, but I am sure you can Google them. I can say this thou, if your happy with your 60 ft. times, and your running short on RPM at the big end something has to give....LOL
    If you real close on the big end, maybe consider useing a taller tire or even a stickier compound. Of course there are a lot of variables. Are you spinning a lot out of the box ? If so how bad ? You may find out a tire change is all thats needed?

  6. #6
    Senior Member RACING JUNKIE fla1976's Avatar
    Join Date
    Aug 2007
    Posts
    1,527
    Here is a simple calculator that may help.

    http://golenengineservice.com/calc/calcrgr.htm


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