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Tremec Tire Ratio Formula:
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The Tremec Tire Ratio Calculator determines the speedometer ratio for Tremec transmissions using tire diameter, gear ratio, and axle ratio. This calculation helps ensure accurate speedometer readings after transmission or tire modifications.
The calculator uses the Tremec ratio formula:
Where:
Explanation: This formula calculates the correct speedometer drive ratio needed to maintain accurate speed readings after changing tire size, gear ratios, or axle ratios.
Details: Accurate speedometer calibration is essential for vehicle safety, compliance with traffic laws, and proper transmission operation. Incorrect speedometer readings can lead to speeding tickets and improper shift points.
Tips: Enter tire diameter in inches, gear ratio as a decimal value, and axle ratio as a decimal value. All values must be positive numbers greater than zero for accurate calculation.
Q1: Why is the constant 336 used in the formula?
A: The constant 336 is derived from unit conversions that account for inches, miles, hours, and revolutions to provide accurate speedometer calibration.
Q2: How do I measure tire diameter accurately?
A: Measure from the ground to the top of the tire while properly inflated and under load, or use manufacturer specifications for your specific tire size.
Q3: What if I have multiple gear ratios?
A: Use the gear ratio for the specific gear you want to calibrate (typically the 1:1 ratio gear, which is usually 4th gear in 4-speed transmissions).
Q4: Can this calculator be used for automatic transmissions?
A: While primarily designed for Tremec manual transmissions, the formula can be applied to automatic transmissions with appropriate gear ratio data.
Q5: How accurate is this calculation?
A: The calculation provides a theoretical ratio that should be verified with actual road testing for precise speedometer calibration.