# Gear Design Equations Calculator

Automobile Car Truck Formulas

Solving For Crawl Gear Ratio Inputs:
rear axle differential ratio
unitless
transfer case low range ratio
unitless
transmission low gear ratio
unitless

## Conversions:

rear axle differential ratio
= 0
= 0
transfer case low range ratio
= 0
= 0
transmission low gear ratio
= 0
= 0

crawl ratio
= NOT CALCULATED

## Other Units:

Change Equation
Select to solve for a different unknown
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, transfercase low range and transmission ratios section width = millimeters aspect ratio = unitless

References - Books: See 3 and 4 on reference page

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By Jimmy Raymond Contact: aj@ajdesigner.com