1. What is Crawl Ratio?

The crawl ratio is a measure of a 4x4 vehicle's low-speed capability in off-road situations. It represents the overall gear reduction from the engine to the wheels when in the lowest available gear combination.

2. How Does the Calculator Work?

The calculator uses the crawl ratio formula:

Where:

• \( \text{Trans Low} \) — Transmission's lowest gear ratio
• \( \text{Tcase Low} \) — Transfer case low-range ratio
• \( \text{Diff Ratio} \) — Differential gear ratio

Explanation: The crawl ratio shows how many engine revolutions are needed to turn the wheels once. Higher numbers mean better low-speed control.

3. Importance of Crawl Ratio

Details: A proper crawl ratio is crucial for off-road performance, allowing precise throttle control on steep inclines, technical terrain, and when rock crawling.

4. Using the Calculator

Tips: Enter your vehicle's transmission low gear ratio, transfer case low range ratio, and differential ratio. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's a good crawl ratio for off-roading?
A: For serious rock crawling, 50:1 or higher is recommended. Moderate off-road use can work with 30:1-50:1.

Q2: How can I improve my crawl ratio?
A: Options include changing differential gears, installing a lower transfer case, or using an underdrive unit.

Q3: Does crawl ratio affect highway driving?
A: Only when in low range. High range performance is unaffected by crawl ratio.

Q4: What's a typical transfer case low range ratio?
A: Most are between 2:1 to 4:1, with some extreme cases going up to 10:1.

Q5: Can I calculate crawl speed with this?
A: Yes, combine crawl ratio with tire size and engine idle RPM to estimate minimum forward speed.