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# How To Tell Rear End Gear Ratio By Vin

You’ve just picked up a new car and you’re trying to figure out what gear ratio it’s in. You see the label on the transmission housing that says “Rear End Gear Ratio (Rerg)”, but you don’t know what it means. Don’t worry; we have you covered. This blog post will explain what Rear End Gear Ratio (Rerg) means and how to use it to figure out your car’s gear ratio. ###

## Rear End Gear Ratio (RER)

Most cars have a gear ratio in the rear end that is numerically higher than the gear ratio in the front end. This is because the rear end is typically used for slower speeds and/or longer distances. The gear ratios in the rear end are often printed on a tag or sticker near the axle nuts.

## What is a Rear End Gear Ratio (RER)?

A rear end gear ratio is the ratio of the overall gear size to the input shaft speed. In other words, it’s how fast the engine is turning compared to the number of gears being used.

Most cars use a 4-speed automatic transmission, which means there are four ratios: 1st, 2nd, 3rd, and 4th. The first gear is usually very low (1st), the second gear is about half (2nd), third gear is about two thirds (3rd), and fourth gear is high (4th).

Some trucks and SUVs use a 5-speed automatic transmission, which means there are five ratios: 1st, 2nd, 3rd, 4th, 5th, and 6th. The first gear is usually very low (1st), the second gear is about half (2nd), third gear is about one third (3rd), fourth gear is high (4th), fifth gear is medium low (5th), sixth gear is medium high (6th).

## How to Check the Rear End Gear Ratio (RER)?

Checking the Rear End Gear Ratio (RER) is a common maintenance procedure on many vehicles. RER is important to keep in check because it affects the engine’s ability to turn and the vehicle’s overall acceleration.

To check RER, you’ll need to access the car’s computer system. There are a few ways to do this, but the easiest is to use a scanner and connect it to the car’s diagnostics port. Once connected, you can access diagnostic information that will show you RER.

If your car doesn’t have a diagnostic port, or if you don’t want to scan it, there are other ways to find out RER. You can use an online calculator or a tool found on most car parts stores. Just remember that these methods are not as accurate as using a scanner or computer system, so be sure to double-check the results.

## Significance of a Rear End Gear Ratio (RER)

Rear end gear ratios (RER) are important for two reasons. First, they affect how quickly the car moves from one gear to another. Second, they affect how much power the engine can generate. A high RER can result in a higher speedometer reading and more horsepower at the wheels. A low RER can cause problems with acceleration and fuel economy.

A high RER generally results in a faster speedometer reading and more horsepower at the wheels. High RERs are most common on sports cars and muscle cars. Low RERs are more common on sedans and SUVs, and can result in decreased acceleration and fuel economy.

When you’re shopping for a new car, make sure to check the RER. It’s usually listed on the window sticker or elsewhere on the vehicle documentation. If you don’t have access to your car’s documentation, you can usually find the RER by looking under “Engine Size” on a car search website like CarGurus or Edmunds

## Conclusion

Sometimes it can be hard to tell what gear ratio a car is running by just looking at it. In this article, we will show you how to identify the rear end gear ratio of a car by Vin number. This will help you figure out which gears to use when driving the car and improve your fuel efficiency.