How to tell what differential you have on a Chevy?
Understanding the type of differential in your Chevy is crucial for proper maintenance, repairs, and upgrades. Whether you're working on a restoration project or simply trying to replace a part, identifying your differential can save you time and money. In this guide, we’ll walk you through the steps to determine what differential your Chevy has.
What Is a Differential and Why Does It Matter?
The differential is a key component of your vehicle's drivetrain. It allows the wheels to rotate at different speeds, which is essential when turning corners. Chevy vehicles come with various types of differentials, including open, limited-slip, and locking differentials. Knowing which one you have is important for selecting compatible parts and ensuring optimal performance.
Steps to Identify Your Chevy Differential
Follow these steps to determine the type of differential in your Chevy:
- Check the RPO Code: Locate the Regular Production Option (RPO) code sticker, typically found in the glove box, on the driver’s door jamb, or in the trunk. Look for codes like "G80" (indicating a limited-slip differential) or other specific identifiers.
- Inspect the Differential Cover: The shape and bolt pattern of the differential cover can provide clues. For example, a 10-bolt cover is common on many Chevy trucks, while a 12-bolt cover might indicate a heavy-duty application.
- Count the Bolts: Count the number of bolts on the differential cover. This is a quick way to narrow down the type of differential you have.
- Measure the Ring Gear: If you have access to the internal components, measure the diameter of the ring gear. Common sizes for Chevy vehicles include 7.5 inches, 8.5 inches, and 9.5 inches.
- Spin the Wheels: Jack up the rear of the vehicle and spin one wheel. If the opposite wheel spins in the same direction, you likely have a limited-slip or locking differential. If it spins in the opposite direction, it’s likely an open differential.
- Consult the Owner’s Manual: Your Chevy’s owner’s manual may include information about the factory-installed differential.
Common Chevy Differential Types
Here are some of the most common differentials found in Chevy vehicles:
- Open Differential: Standard on many vehicles, this type allows the wheels to spin independently, which is ideal for everyday driving.
- Limited-Slip Differential (LSD): Provides better traction by limiting the difference in wheel speed, commonly found in performance and off-road vehicles.
- Locking Differential: Locks both wheels together for maximum traction, often used in trucks and off-road applications.
When to Seek Professional Help
If you’re unable to identify your differential or need assistance with repairs, it’s always a good idea to consult a professional. At Kevin’s Autos, we specialize in drivetrain diagnostics and repairs. Our experienced technicians can help you identify your differential and ensure it’s functioning properly.
Conclusion
Identifying your Chevy’s differential doesn’t have to be a daunting task. By following the steps outlined above, you can determine the type of differential you have and make informed decisions about maintenance and upgrades. If you’re ever in doubt, don’t hesitate to reach out to a trusted auto repair shop like Kevin’s Autos for expert advice and service.
Frequently Asked Questions
How do you tell the difference between limited slip diff and normal diff?
Like an open differential, the wheels can rotate at different speeds. However, with a limited slip differential, torque is not always balanced between the wheels. This allows the wheel with traction to receive more torque in order to continue to move the vehicle.
How do I tell what gear ratio my Chevy rear end has?
Check the Differential Cover
The axle may have a sticker, and on the differential cover, you might have a small metal tag that's sticking out that will have the gear ratio stamped on it.
How do I identify my rear axle F-350?
1999-2016 Dana 80 Dual Rear Wheel Rear Axles in Ford F-350, F-450 Super Duty trucks and motorhome chassis have a Bill of Material Number (BOM) stamped on a Build Tag (red arrow) attached to the differential by two of the differential cover bolts (yellow arrows).
Can you tell what rear end you have by VIN number?
You don't. That information is not contained in the VIN, UNLESS a specific model only gets one rear end ratio. VIN tells country of manufacture, vehicle make, class, engine type, size, date of manufacture, plant and serial number. That is the ONLY information contained by the VIN.
How do I identify my Chevy differential?
Identify your GMC or Chevrolet rear end gear ratio by the RPO Codes, usually located on the placard labeled “Service Parts Identification” inside the drivers door panel or glove box.
How can I tell what gear ratio I have without pulling cover?
I have my buddy holding the other Tire. I start spinning this and I'm watching the other. One. That's one full rotation right there.
How do I tell if my truck has a limited slip differential?
Many vehicles also have a tag or writing on the diff if they are an LSD. It may say LS 90 or something similar. Another way to find out, if they don't want to get dirty, is to contact the dealer, check the owner's manual or take the car into a workshop and get them to check it.
How can you tell the difference between a 3.73 and a 4.10 gear ratio?
Likewise, if the driveshaft spins roughly 3 ¾ times, that will equal a 3.73 rear end gear, and if it spins just over 4 times, this will equate to a 4.10 rear end gear.
How do you tell what type of differential you have?
Without an ID tag, differentials are identified by the number of cover bolts, the distinctive shape of the cover, the number of ring gear bolts, and ring gear diameter. They can also be identified by whether the center section is an integral or dropout design.
Is 3.73 gear ratio good?
A 3.73 gear ratio is going to be good for several different reasons, depending on the application. For a truck, it is great for heavier loads where factory gear ratios that are 3.55 or 3.31.
