BMW E87 LCI E90 E91 120i 320i N43 Torque Converter Automatic Gearbox

BMW E87 E90 E91 120i 320i N43 Torque Converter is a component from the Torque Converters group, designed for automatic transmissions in selected BMW models with the N43 engine. It is responsible for the smooth transfer of torque from the crankshaft to the transmission, improving gear shifting comfort and the overall refinement of the drivetrain.

Specifications and technical data

• SKU: 7588732
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7588732
• Substitutable numbers: 24407588732, 7588732, 24407581972, 7581972
• Gearbox type: Automatic
• Tire profile: 65535
• Category: Torque Converters

Purpose and Function in the Drivetrain

The torque converter in an automatic transmission plays a crucial role in damping torsional vibrations and ensuring smooth vehicle starts. For N43 units in BMW 1 and 3 Series models, its proper operation directly impacts:

• engine speed stability during starts and acceleration,
• smooth gear changes without jerking,
• reduction of mechanical stress in the automatic transmission.

A well-matched torque converter helps maintain correct transmission operating parameters, leading to predictable vehicle behavior in both city and highway driving.

Compatibility with Automatic Transmission

The presented component is designed to work with the automatic transmission used in selected versions of the BMW E87, E90, and E91 with the N43 engine. The torque converter's design is adapted to the torque characteristics of this unit, enabling:

• efficient power transfer under various loads,
• maintenance of appropriate hydrodynamic slip,
• correct interaction with the automatic transmission control system.

By preserving the original geometry and operating parameters, installing such a torque converter is the preferred solution for drivetrain repairs on these models.

Technical Characteristics and Benefits of Use

The torque converter in this series has been developed to meet the specific requirements of N43 gasoline engines. The use of appropriately selected hydraulic ratios and adaptation to automatic transmission control allows for:

• more predictable throttle response across the entire RPM range,
• reduction of perceptible vibrations transmitted to the body,
• stable operation at low speeds, essential for city driving.

Replacing a worn-out torque converter with a functional component from the Torque Converters group is often a key step in resolving symptoms such as transmission slippage, gear change jerks, or excessive transmission fluid overheating.

Component Condition and Service Application

The offered torque converter is a used part, making it an attractive solution for servicing older BMW models where a balance between repair cost and maintaining correct drivetrain operating parameters is important. This type of component is particularly useful in situations where:

• the existing torque converter shows signs of mechanical or hydraulic wear,
• an automatic transmission is being refurbished or replaced,
• correct cooperation between the N43 engine and the transmission needs to be restored.

Selecting the correct component according to the manufacturer's designations helps limit the risk of improper fitment and accelerated wear of other components.

Drivetrain Expansion and Additional Materials

If you are planning a comprehensive repair or upgrade of the drivetrain area in your BMW and need other parts from the same group, such as housings, mounting elements, or additional hydraulic components, check the available parts in the BMW Torque Converters category.

To better understand the operation of drivetrain systems and the relationships between the automatic transmission, torque converter, and drivetrain systems, it is worth familiarizing yourself with technical material describing various AWD solutions in premium cars – you can find it in the article xDrive, 4Matic, quattro or 4Motion – comparison of AWD drives from BMW, Mercedes, Audi and VW.