Davis Bellew If you own a Subaru vehicle, it is important to know what gear ratio your differential has. The gear ratio is the number of teeth on the ring gear divided by the number of teeth on the pinion gear. It determines the torque and speed of the wheels, which affects the vehicle’s acceleration and fuel efficiency. In this article, we will discuss several methods to help you determine what gear ratio your Subaru diff is.
Key Takeaways
- The gear ratio determines the torque and speed of the wheels.
- You can identify the specific model of your vehicle and check the VIN to determine the gear ratio.
- You can use a gear ratio calculator or inspect the differential case to determine the gear ratio.
- Consulting an expert mechanic is always an option if you’re unsure.
Method 1: Identify the Specific Model of Your Vehicle
The gear ratio of your Subaru diff may depend on the specific model of your vehicle. You can find this information in the owner’s manual or by contacting the dealership. Once you have identified the model, you can research the gear ratios that were available for that model.
Method 2: Check the VIN
The VIN or vehicle identification number is a unique 17-digit code that contains information about your vehicle, including the gear ratio. You can find the VIN on your registration or insurance documents, or on the driver’s side of the dashboard near the windshield.
Use an online VIN decoder to interpret the information in the VIN. The decoder will provide you with the gear ratio and other important details about your Subaru vehicle.
Method 3: Use a Gear Ratio Calculator
Another way to determine the gear ratio of your Subaru diff is to use a gear ratio calculator. This tool requires you to input the number of teeth on the ring gear and pinion gear, and it will calculate the gear ratio for you.
You can find gear ratio calculators online, such as the one provided by Summit Racing. To use this calculator, you’ll need to remove the differential cover and count the number of teeth on the ring gear and pinion gear.
Method 4: Inspect the Differential Case
If you’re comfortable working on your Subaru vehicle, you can inspect the differential case to determine the gear ratio. To do this, you’ll need to remove the differential cover and locate the gear markings on the ring gear and pinion gear.
The gear markings are usually stamped or etched onto the gears and will indicate the number of teeth on each gear. You can then divide the number of teeth on the ring gear by the number of teeth on the pinion gear to determine the gear ratio.
Method 5: Consult an Expert Mechanic
If you’re still unsure about the gear ratio of your Subaru diff, it’s always a good idea to consult an expert mechanic. They have the knowledge and experience to help you determine the gear ratio and can also advise you on any necessary repairs or maintenance.
Tips and Tricks
- Use a multimeter to test the resistance of the differential speed sensor to ensure it is working properly.
- Clean the differential case and gears before inspecting them to make it easier to read the gear markings.
- Use a magnetic oil drain plug to catch any metal shavings that may be present in the differential oil.
FAQ
What is a gear ratio?
A gear ratio is the number of teeth on the ring gear divided by the number of teeth on the pinion gear. It determines the torque and speed of the wheels in a vehicle.
Why do I need to know my Subaru diff gear ratio?
Knowing your Subaru diff gear ratio is important because it affects the acceleration and fuel efficiency of your vehicle. It can also determine the type of differential that is installed.
How do I find the VIN on my Subaru vehicle?
The VIN can be found on your registration or insurance documents, or on the driver’s side of the dashboard near the windshield.
How do I use a gear ratio calculator?
You’ll need to remove the differential cover and count the number of teeth on the ring gear and pinion gear. Input these numbers into the gear ratio calculator, and it will calculate the gear ratio for you.
Can I determine the gear ratio without removing the differential cover?
It is possible to estimate the gear ratio by counting the number of teeth on the ring gear and dividing it by the number of teeth on the pinion gear. However, this method may not be as accurate as inspecting the differential case.
Determining the gear ratio of your Subaru diff is important for maintaining and repairing your vehicle. By using the methods outlined in this article, you can confidently determine the gear ratio and make any necessary repairs or modifications. Remember to always consult an expert mechanic if you’re unsure or uncomfortable with the process.
