1. What is the 700r4 Speedometer Gear Equation?

The 700r4 Speedometer Gear Equation calculates the proper speedometer gear teeth count for GM's 700R4 transmission based on axle ratio, tire revolutions per mile, and drive teeth count. This ensures accurate speedometer readings after gear or tire changes.

2. How Does the Calculator Work?

The calculator uses the 700r4 equation:

Where:

• \( Axle \) — Rear axle ratio
• \( Tire\ revs/mile \) — Tire revolutions per mile
• \( Drive\ teeth \) — Number of teeth on drive gear

Explanation: The equation accounts for the relationship between drivetrain components and tire size to determine the correct speedometer gear.

3. Importance of Correct Speedometer Gear

Details: Proper speedometer calibration is crucial for accurate speed readings, odometer function, and transmission shift points in vehicles with electronic controls.

4. Using the Calculator

Tips: Enter axle ratio (e.g., 3.73), tire revolutions per mile (can be calculated from tire size), and drive teeth count (typically 15 for 700R4). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Where can I find my tire revs per mile?
A: Check tire manufacturer specifications or use a tire size calculator. Typical values range from 600-800 revs/mile.

Q2: How do I know my axle ratio?
A: Check vehicle documentation, look for axle code, or count driveshaft vs wheel rotations (with one wheel raised).

Q3: What if my calculated gear isn't a whole number?
A: Round to nearest available gear tooth count (gears typically come in whole tooth increments).

Q4: Does this work for other transmissions?
A: This equation is specific to 700R4/4L60 transmissions. Other transmissions may use different formulas.

Q5: Why is the constant 1001 used?
A: This is a transmission-specific constant that accounts for internal gearing in the 700R4 speedometer drive system.