1. What is the 700R4 Speedometer Gear Calculation?

The 700R4 speedometer gear calculation determines the correct number of teeth needed on the speedometer drive gear to maintain accurate speedometer readings after changing axle ratios or tire sizes.

2. How Does the Calculator Work?

The calculator uses the following equation:

Where:

• \( Axle\ Ratio \) — Final drive ratio (e.g., 3.73)
• \( Tire\ Diameter \) — Overall tire diameter in inches
• 1001/1000 — Constant for 700R4 transmission

Explanation: The equation accounts for the relationship between axle ratio, tire size, and the required speedometer gear teeth to maintain proper speedometer calibration.

3. Importance of Correct Speedometer Gear

Details: Using the correct speedometer gear ensures accurate speedometer and odometer readings, which is important for vehicle operation, maintenance scheduling, and legal compliance.

4. Using the Calculator

Tips: Enter axle ratio as a decimal (e.g., 3.73 as 3.73) and tire diameter in inches. Measure tire diameter accurately for best results.

5. Frequently Asked Questions (FAQ)

Q1: How do I measure tire diameter?
A: Measure from the ground to the top of the tire while the vehicle is on level ground with normal tire pressure.

Q2: What if my calculated teeth don't match available gears?
A: Choose the closest available gear tooth count. Small differences can often be corrected with speedometer calibration.

Q3: Does this work for other transmissions?
A: No, this calculation is specific to the 700R4 transmission. Other transmissions use different constants.

Q4: What's the typical range for gear teeth?
A: Most 700R4 speedometer gears range from 34 to 45 teeth, depending on application.

Q5: Will this affect my transmission shifting?
A: No, this only affects speedometer accuracy. Transmission shifting is controlled separately.