Audi A4 S4 B9 A5 S5 F5 3.0 Rear Axle Differential 43:13 SRP 0G2500043D WARRANTY

Listing details

The differential is sold with a 90-day warranty! It was tested before removal and is in full working order.

Audi A4 S4 B9 A5 S5 F5 3.0 Rear Axle Differential 43:13 SRP is an original drivetrain component from the Differentials category, designed for installation on the rear axle of Audi vehicles. The precisely selected 43:13 gear ratio ensures predictable vehicle behavior, stability at higher speeds, and proper torque distribution on the rear axle.

Specifications and technical data

• SKU: 0G2500043D
• Mark: Audi
• Condition: Used
• OEM Part Number: 0G2500043D
• Substitutable numbers: 0G2500043D, 0G2 500 043 D
• Location on the vehicle: Rear
• Category: Differentials

Purpose and function in the drivetrain

The presented rear axle is dedicated to mid-size and sports Audi models with a 3.0 engine, where it is responsible for transferring power to the rear axle and properly differentiating wheel rotational speeds. Its rear-mounted position allows for effective interaction with the final drive and potential all-wheel-drive systems, maintaining factory handling characteristics.

Choosing a differential with a specific gear ratio has a direct impact on:

• the car's throttle response and acceleration dynamics,
• engine RPM at highway speeds,
• traction stability in corners and on slippery surfaces.

Technical specifications and compatibility

The rear differential with a 43:13 gear ratio has been designed as an OEM component, which means it maintains factory manufacturing tolerances and fits the original mounting points in the Audi chassis. The axle construction is optimized for compatibility with the stock suspension and drivetrain, meaning it does not require any interference with geometry or additional mounting modifications.

In practice, this means that when correctly matched to the vehicle's engine and drivetrain version, you can count on:

• consistent operation with the existing transmission,
• retention of factory acceleration and top speed parameters,
• no need for electronic adaptation resulting from a different gear ratio.

Condition, origin, and benefits of using a used differential

The offered rear axle comes from dismantling and is sold as a used part, which represents a reasonable compromise between repair costs and maintaining OEM quality. Compared to unreliable aftermarket replacements, an original differential from dismantling allows you to maintain factory drivetrain performance parameters and reduce the risk of issues such as noise, play, or leaks.

Choosing a used OEM component is particularly beneficial when:

• the existing axle has suffered mechanical damage or overheating,
• there is noticeable noise, whining, or jerking from the rear axle,
• a quick and economical replacement is necessary without sacrificing factory specifications.

Professional gear ratio selection and technical support

When replacing a differential, it is crucial to match the gear ratio to the transmission and driving style. To better understand the relationships between axle ratio, acceleration characteristics, and driving comfort, it is worth checking out our guide: Dismantled drive axles and differentials – how to choose gear ratios for your driving style. The article technically discusses definitions, configuration examples, and the most frequently asked questions related to choosing a drive axle.

If you want to deepen your knowledge about the benefits of using a used OEM differential instead of unreliable replacements, the following material will also be helpful: Whining differential? Learn why a used OEM drive axle is a better investment than an uncertain replacement. You will find practical tips there regarding noise diagnostics and choosing the right axle from dismantling.

Drivetrain upgrades in Audi – related components

If you are planning a comprehensive repair or upgrade of the drivetrain area in your Audi and need other components from the same group, such as additional axles, differentials with different gear ratios, or compatible final drives, check out the available parts in the Audi Differentials category.

Such an approach allows for a consistent refresh of the entire drivetrain system, reducing the risk of uneven component wear and maintaining the predictable, factory-like handling character of your car.