Description

Audi A4 B5 B5.5 Automatic Rear Differential 01H500040K DAK 37:9 – 1995–2001

Genuine Used Audi A4 Rear Differential – DAK 37:9

For sale is a used Audi A4 B5/B5.5 rear differential and final-drive assembly, OEM part number 01H500040K, with DAK transmission/final-drive code and a 37:9 final-drive ratio.

This rear differential is designed for compatible Audi driveline applications and transfers torque between the rear axle shafts while allowing the rear wheels to rotate at different speeds when cornering.

The 37:9 ratio is approximately 4.111:1, making the final-drive ratio an important specification when matching this differential to the vehicle’s transmission and Quattro drivetrain.

Product Details

• Product: Rear Differential / Final Drive
• OEM Part Number: 01H500040K
• Differential Code: DAK
• Final-Drive Ratio: 37:9
• Approximate Ratio: 4.111:1
• Vehicle: Audi A4 B5 / B5.5
• Transmission Application: Automatic
• Potential Model Years: 1995–2001
• Position: Rear axle
• Condition: Used / Pre-Owned
• Application: Rear final drive / differential
• Worldwide Shipping: Available

Audi A4 B5 Rear Differential

The rear differential is a key component of the Audi drivetrain. It transfers engine torque through the driveline to the rear wheels while allowing the left and right wheels to rotate at different speeds during turns.

The 01H500040K DAK rear differential is identified by its part number and 37:9 final-drive ratio. Correct gearing is critical when replacing a differential, particularly on vehicles equipped with all-wheel-drive systems.

A mismatched final-drive ratio can cause driveline problems and may result in abnormal stress on drivetrain components. For this reason, the original differential code, final-drive ratio and vehicle drivetrain specification should be verified before purchase.

Vehicle Fitment

Potential application:

• Audi A4 B5
• Audi A4 B5.5
• Approximately 1995–2001
• Automatic transmission applications
• Compatible drivetrain configurations using the DAK 37:9 final drive

Exact fitment depends on:

• Vehicle model year
• Engine
• Transmission code
• Automatic gearbox
• Drivetrain configuration
• Quattro specification
• Final-drive ratio
• Rear differential code
• OEM part number

Important Fitment Notice

Please verify 01H500040K, DAK, and 37:9 against your original differential before ordering.

Do not select a rear differential based only on the Audi A4 model or year. The final-drive ratio must match the rest of the vehicle’s drivetrain.

If possible, compare the identification label/stamping on your existing differential with the part being sold.

Condition

This is a used / pre-owned Audi rear differential.

The housing may show normal signs of previous use, including surface marks, dirt, oxidation, scratches or cosmetic wear.

Please inspect the product photographs carefully to confirm the actual condition and included components.

Before installation, the differential should be inspected for:

• Oil leaks
• Housing damage
• Mounting-point damage
• Excessive backlash
• Bearing noise or play
• Flange condition
• Seal condition
• Correct gear ratio and identification markings

Installation & Service

Professional installation is recommended for this drivetrain component.

Before installation:

1. Confirm the differential code and ratio.
2. Verify compatibility with the transmission and drivetrain.
3. Inspect mounting points and associated driveline components.
4. Check seals and flange condition.
5. Fill with the correct manufacturer-specified differential oil.
6. Check for leaks after installation.
7. Road-test the vehicle and listen for abnormal drivetrain noise.

A professional technician should verify differential operation before the vehicle is returned to normal use.

Worldwide Shipping

Audi Parts 05 offers worldwide shipping on used Audi differentials, final drives, Quattro drivetrain components, transmissions and other Audi replacement parts.