Who makes transmissions for Lexus?
Most Lexus transmissions are built by Aisin Seiki’s Aisin AW division, which supplies the bulk of conventional automatic gearboxes. Toyota Motor Corporation handles the hybrid transaxles in-house, providing the gearboxes used across Lexus hybrid models.
Primary transmission suppliers
Below are the two main sources responsible for the vast majority of Lexus transmissions, covering both standard automatics and hybrids.
Aisin Seiki / Aisin AW — Provides the majority of conventional automatic transmissions for Lexus models, including the 6-, 8-, and 10-speed units used across the lineup.
Toyota Motor Corporation — Produces hybrid transaxles and automatic components in-house, which are used in most Lexus hybrid models and other Toyota hybrid platforms.
In summary, Aisin AW is the dominant supplier for non-hybrid automatics, while Toyota supplies the hybrid transaxles and related systems. Regional variations and model-specific configurations can lead to small deviations, but these two organizations cover the core supply.
Hybrid transmissions and integration
Hybrid models in the Lexus lineup rely on an integrated transaxle design that blends the petrol engine, electric motor, and reduction gear. These hybrid transaxles are primarily developed and produced within Toyota’s own engineering-and-manufacturing network, ensuring tight integration with Lexus hybrid systems and powertrains.
Note: While Toyota leads the hybrid transaxle development, components and manufacturing partnerships at times involve suppliers within the broader Toyota family of companies, including Aisin for certain accessory components or subassemblies as needed for regional production.
Hybrid transaxle systems (Toyota) — Integrated units that combine powertrain elements for Lexus hybrid models.
Electric motor/generator components (Toyota/Aisin ecosystem) — Parts sourced within the Toyota-Aisin supplier network to support hybrid operation.
Overall, the hybrid side of Lexus transmissions is closely aligned with Toyota’s in-house capabilities, ensuring cohesive performance across the hybrid lineup.
Summary
In short, Lexus transmissions are primarily sourced from two sources: Aisin AW handles the conventional automatic transmissions, while Toyota manufactures the hybrid transaxles and related components in-house. This collaboration underpins the performance and efficiency characteristic of Lexus powertrains across both standard and hybrid models.
