how to find axle ratio ram 1500

Daniel Parker

3 min read

·

16-01-2025

1

0

Share

Finding your Ram 1500's axle ratio might seem daunting, but it's simpler than you think. Knowing your axle ratio is crucial for several reasons, including:

• Correct tire size selection: Using the wrong tire size can throw off your speedometer and odometer readings, potentially affecting your fuel economy. It can also affect your transmission's performance.
• Gear ratio calculations: Understanding your axle ratio is essential for calculating the optimal gear ratios for off-roading or towing.
• Performance tuning: Accurate axle ratio information helps you fine-tune your vehicle's performance and handling.
• Troubleshooting issues: An incorrect axle ratio can lead to transmission problems. Knowing the correct ratio aids diagnosis.

This guide provides multiple methods to determine your Ram 1500's axle ratio, catering to various comfort levels with vehicle mechanics.

Method 1: Checking the Driver's Side Door Jamb

The easiest method is often overlooked. Your Ram 1500's axle ratio might be printed on a sticker located on the driver's side doorjamb. This sticker usually contains a wealth of information about your truck, including the tire size, VIN, and often the axle ratio. Check this sticker carefully; the information is often presented as a simple number, like "3.55" or "3.92."

Method 2: Examining the Vehicle Identification Number (VIN) Decoder

The VIN, found on your dashboard and various other places on the vehicle, contains a wealth of coded information about your Ram 1500. You can use online VIN decoders (many are free) to find detailed specifications, including the axle ratio. These websites require only your VIN number. Just be sure to use a reputable decoder.

Method 3: Checking the Build Sheet (If Available)

If you still have the original build sheet for your Ram 1500, it will specify the axle ratio. This is a definitive source. Keep your build sheet with your vehicle's important documents.

Method 4: Physical Inspection (Advanced)

This method requires some mechanical knowledge and involves looking at the axle itself. Safety First: Always use jack stands and follow proper safety procedures when working under your vehicle.

1. Locate the differential: This is the casing that houses the gears. It's usually located at the rear of the vehicle.
2. Identify the ring gear: The ring gear is the larger gear. Count the number of teeth.
3. Identify the pinion gear: This is the smaller gear that meshes with the ring gear. Count its teeth.
4. Calculate the ratio: Divide the number of teeth on the ring gear by the number of teeth on the pinion gear. The resulting number is your axle ratio.

Important Considerations:

• Multiple Axle Ratios: Ram 1500s came with various axle ratios depending on the model year, engine, and trim level. Don't assume your ratio will be the same as another Ram 1500, even if it's the same model year.
• Accuracy: The physical inspection method requires precision. An inaccurate count will lead to an incorrect axle ratio.

Frequently Asked Questions (FAQs)

Q: What does the axle ratio actually mean?

A: The axle ratio represents the relationship between the number of revolutions the driveshaft makes and the number of revolutions the wheels make. A lower ratio (e.g., 3.21) means more speed and less torque, while a higher ratio (e.g., 4.10) means more torque and less speed.

Q: Why is it important to know my Ram 1500's axle ratio?

A: Knowing your axle ratio is crucial for accurate calculations when modifying your vehicle. Incorrect ratios can affect speedometer accuracy, fuel economy, and even transmission health.

By using one or more of the methods outlined above, you should be able to easily determine your Ram 1500's axle ratio. Remember to prioritize safety if you're performing a physical inspection. If you're unsure about any aspect of this process, consult a qualified mechanic.