1. What is Transfer Case Gear Ratio?

The transfer case gear ratio is the ratio between the input rotation speed (from the transmission) and the output rotation speed (to the driveshafts). It determines how much the torque is multiplied in 4WD and AWD vehicles.

2. How Does the Calculator Work?

The calculator uses the simple ratio formula:

Where:

• Input RPM — Rotation speed from the transmission
• Output RPM — Rotation speed to the driveshafts
• Ratio — Dimensionless value representing the gear reduction

Explanation: A ratio greater than 1 indicates torque multiplication, while a ratio less than 1 indicates overdrive.

3. Importance of Gear Ratio Calculation

Details: Knowing your transfer case ratio is essential for proper vehicle modification, tire size selection, and understanding your vehicle's off-road capabilities.

4. Using the Calculator

Tips: Measure input RPM (typically at the transmission output shaft) and output RPM (at the transfer case output shafts). Both values must be greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical transfer case ratio?
A: Common ratios include 1:1 (high range), 2.72:1, or 4:1 (low range) depending on the vehicle and transfer case model.

Q2: How does ratio affect performance?
A: Higher ratios provide more torque multiplication for off-road crawling but reduce top speed. Lower ratios allow higher speeds but less torque.

Q3: Can I change my transfer case ratio?
A: Yes, through gear swaps, but this requires matching components and may affect vehicle dynamics.

Q4: How does ratio relate to crawl ratio?
A: Crawl ratio is the product of transmission gear ratio, transfer case ratio, and axle ratio - showing overall reduction.

Q5: Why measure RPM instead of counting teeth?
A: RPM measurement is often more practical for field verification, while tooth count gives theoretical ratio.