Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Gear Ratio Calculation
Example:
| Β | 7. Gear | Final Drive |
|---|---|---|
| Drive gear | ZG1 = 49 | ZA1 = 17 |
| Driven gear | ZG2 = 32 | ZA2 = 71 |
i = Z2 : Z1 (Z1 = Number of teeth on the drive gear, Z2 = number of teeth on the driven gear)
iG = gear ratio = ZG2 : ZG1 = 32 : 49 = 0.653
iA = axle ratio = ZA2 : ZA1 = 71 : 17 = 4.176
itotal = total ratio= iG x iA = 0.653 x 4.176 = 2.730
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.