Automobile Car Truck Formulas

Solving For Crawl Gear Ratio

Inputs:

rear axle differential ratio

= 0

= 0

transfer case low range ratio

= 0

= 0

transmission low gear ratio

= 0

= 0

crawl ratio

= NOT CALCULATED

Select to solve for a different unknown

speed | |

rotation velocity | |

gear ratio | |

tire size - radius | |

effective gear ratio | |

tire size - diameter | |

crawl ratio |

Where

speed | = | MPH - miles per hour |

tire radius, tire diameter, rim diameter | = | inches |

gear ratio | = | if ring and pinion ratio is 4.10:1 use 4.10 |

rotation velocity | = | RPM - revolutions per minute |

effective gear ratio | = | determine new gear ratio after a tire size change |

crawl ratio | = | four wheel drive rear axle differential, transfer |

section width | = | millimeters |

aspect ratio | = | unitless |

References - Books: See 3 and 4 on reference page

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