Audi Q5 FY 40 TDI Rear Differential Diff Ratio 53:10 TJR 0B0500043N WARRANTY

Listing details

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

Audi Q5 FY 40 TDI Rear Differential Diff Ratio 53:10 TJR is an original drivetrain component designed for the vehicle's rear axle. Engineered to work with a diesel engine and an automatic transmission, it ensures stable torque distribution and predictable vehicle handling. Thanks to its factory design, this differential maintains the correct axle ratio and driving characteristics in accordance with the manufacturer's standards.

Specifications and technical data

• SKU: 0B0500043N
• Mark: Audi
• Condition: Used
• OEM Part Number: 0B0500043N
• Substitutable numbers: 0B0500043N, 0B0 500 043 N
• Location on the vehicle: Rear
• Fuel type: Diesel
• Gearbox type: Automatic
• Part type: Differential & Housing Assembly
• Category: Differentials

Purpose and function in the drivetrain

The presented rear differential has been developed for the Audi Q5 FY 40 TDI model, where it is responsible for precise power transmission to the rear axle. The applied ratio of I=53:10 TJR is matched to the characteristics of the diesel unit, which translates into appropriate dynamics while maintaining reasonable engine RPMs during highway and city driving.

The component operates in a system with an automatic transmission, which is why its construction is adapted for smooth gear shifts and the higher torque typical of diesel engines. A properly selected rear differential ratio affects:

• traction stability during acceleration and engine braking,
• even load distribution on half-shafts and tires,
• acoustic comfort at cruising speeds.

Construction and fitment for Audi Q5 FY 40 TDI

The differential belongs to the Differentials group, meaning it is a specialized axle component designed for the specific requirements of the Audi Q5 FY platform. The factory housing geometry and mounting points allow for installation in place of the original component without the need for structural modifications.

Key functional features of this differential include:

• fitment to the rear suspension and Audi drivetrain,
• compatibility with the lubrication and cooling system specified by the manufacturer,
• preservation of the stock rear axle drive characteristics.

As a result, after replacement, the consistency of the entire drivetrain operation is maintained, without unwanted changes in vehicle behavior.

Operating parameters: Diesel and automatic transmission

The differential is intended for use with a diesel unit, meaning its gear ratios and durability are adapted to the high torque available from low RPMs. In combination with an automatic transmission, this ensures:

• smooth acceleration without jerking,
• effective power utilization across the full speed range,
• appropriate gear load during shifting.

A drivetrain configured in this way allows for the retention of factory controller settings and gear-shifting logic, which is particularly important in modern automatics with advanced control electronics.

Use of a pre-owned differential

The offered component comes from the segment of used Audi parts, which represents a reasonable compromise between repair costs and maintaining original specifications. Choosing a differential from disassembly allows you to:

• maintain the factory axle ratio without the need for software modifications,
• preserve mechanical compatibility with other drivetrain components,
• reduce vehicle downtime in the workshop thanks to a ready-to-install component.

This solution is particularly beneficial for repairs where the priority is restoring stock driving parameters without interfering with the vehicle's construction.

Ratio selection and technical knowledge

When replacing a differential, it is crucial to maintain the correct axle ratio to avoid issues with automatic transmission operation, ABS/ESP systems, or speedometer readings. If you want to deepen your knowledge on matching a drive axle to your driving style and understand how the ratio affects dynamics and engine RPM, check out the article Drive axles and differentials from disassembly – how to choose ratios for your driving style.

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 rear differentials, drive axles, or differential gears, check out the available parts in the Audi Differentials category.

To further reduce vehicle downtime in the workshop and better plan your repair, it is worth learning how a wide range of parts from a single warehouse affects the speed of order fulfillment – you can find more on this topic in the material on reducing vehicle downtime thanks to a wide assortment in one warehouse.