Audi S4 B7 Rear Axle Differential Diff 4.2 FSI BBK Quattro 01R500046M WARRANTY

Listing details

The differential is sold with a 90-day warranty! It was tested before removal and is in full working order. Audi S4 B7 Rear Axle Differential Diff 4.2 FSI BBK Quattro is a specialized drivetrain component designed to work with the 4.2 FSI BBK engine and Quattro all-wheel drive system. This rear axle assembly is responsible for the efficient transfer of torque to the wheels, ensuring stable handling and predictable vehicle behavior. Thanks to the use of an original Audi design, the differential maintains the correct operating characteristics of the drivetrain in demanding road conditions.

Specifications and technical data

• SKU: 01R500046M
• Mark: Audi
• Condition: Used
• OEM Part Number: 01R500046M
• Substitutable numbers: 01R500046M, 01R 500 046 M
• Location on the vehicle: Rear
• Part type: Traction Unit
• Category: Additional Differential Parts

Purpose and function in the drivetrain

The rear axle differential in the Audi S4 B7 with Quattro drive is a key component responsible for distributing power to the rear axle and maintaining correct gear ratios throughout the system. It works in direct connection with the driveshaft, differential, and half-shafts, which has a direct impact on:

• smooth torque transfer to the rear wheels,
• traction stability at higher speeds,
• vehicle behavior during dynamic acceleration and engine braking. A properly selected rear axle differential allows for the maintenance of factory Quattro drivetrain parameters, which is particularly important in powerful units such as the 4.2 FSI BBK.

Benefits of using an original differential

Using a differential dedicated to the Audi S4 B7 with Quattro drive provides a number of practical operational benefits. The original design means:

• proper fitment to the rear axle geometry and factory mounting points,
• maintenance of the clearances and gear ratios specified by the manufacturer in the drivetrain,
• consistent operation with other components of the rear differential and drivetrain system. As a result, installation is straightforward, without the need for modifications, and the drivetrain maintains stable operating parameters over a long period of use.

Vehicle placement and installation aspects

The differential is designed for installation in the rear of the vehicle, within the rear axle drivetrain assembly. Such placement requires precise fitting with the differential and driveshaft, which is why it is important to use a component that is structurally compatible with the S4 B7 4.2 FSI BBK Quattro version. During replacement, it is recommended to:

• check the condition of mounts and bushings within the rear axle area,
• verify the tightness of connections and the oil level in the drivetrain system,
• check for play in the differential and at the universal joint or CV joint connections. This approach allows for the restoration of the proper operation of the entire rear drivetrain during a single service operation.

Product characteristics and service application

The offered rear axle differential is a part from the Other differential parts category, intended for service applications in the Audi S4 B7 model with Quattro drive. The used product is a good choice in situations where:

• the existing differential shows excessive play or noise under load,
• mechanical damage has occurred within the rear axle area,
• an economical but technically correct repair of the drivetrain is necessary. Choosing an original used component allows for maintaining the correct drivetrain operating parameters while optimizing repair costs. If you are planning a comprehensive repair or upgrade of the rear axle drivetrain area in your Audi and need other elements from the same group, such as differential housings, gears, or additional components working with the drive, check the available parts in the Other Audi differential parts category.

Selection of used parts and repair economics

When planning a drivetrain repair, it is worth analyzing the cost-to-durability ratio and the impact of the parts used on the further operation of the vehicle. It may be helpful to compare service strategies described in an article regarding the selection of components for popular models of another brand – the principles of choosing between a new and a used part are similar in the case of Audi as well. You can find more practical tips in the material: Spare parts for Ford – tuning and economical repairs.