Toyota Lexus

Lexus NX200t U661F U661E U661 Transmission

Lexus NX200t U661F U661E U661 Transmission

OE NO.:30500-48260
Model Number:U661F U661E U661
Transmission Speeds: 6
Gearbox Type: Automatic
Product description: Application: Lexus Turbo & V6 Models: NX200t / NX300: 2.0L Turbo 8AR-FTS FWD / AWD (2014 - 2021) RX200t / RX300: 2.0L Turbo 8AR-FTS FWD / AWD (2015 - 2022) ES200 / ES250: 2.0L / 2.5L FWD (20
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Model Number	U661F U661E U661
MOQ	1 Pcs
Condition	Remanufactured
Warranty	6 Months

The automatic transmission assembly designed for the Aisin U661F (AWD) and U661E (FWD) 6-speed automatic transmissions. Engineered specifically for transverse layouts and high-torque turbocharged applications, this robust unit is built to handle the power of the 2.0L Turbo (8AR-FTS) engine in the Lexus NX200t, Toyota Highlander, Alphard, and related premium platforms.

Quick Specifications:

Transmission Model: U661F (AWD) / U661E (FWD) / U661
Type: 6-Speed Automatic
Configuration: Transverse Front-Wheel Drive (FWD) / All-Wheel Drive (AWD)
Engine Compatibility: 2.0L Turbo (8AR-FTS), 2.5L, and 3.5L V6 engines
Max Input Torque: ~350-400 Nm
Fluid Type: Toyota ATF WS (World Standard)
Fluid Capacity: ~7.0 - 8.5 Liters (dry fill, varies by FWD/AWD and cooler size)

Applications:

Lexus NX200t / NX300 (2015-2021, 2.0L Turbo FWD/AWD variants)
Toyota Highlander (2016-2019, 2.0L Turbo FWD/AWD variants)
Toyota Alphard / Vellfire (2015-present, 2.0L Turbo and 3.5L V6 variants)
Toyota Harrier (2017-2020, 2.0L Turbo FWD/AWD variants)
Lexus RX200t / RX300 (Select 2.0L Turbo FWD/AWD variants)
Toyota Crown (Select transverse 2.0T platform variants)

Complete Assembly Includes:

✅ Heavy-duty aluminum transmission case with optimized planetary gearsets
✅ High-capacity torque converter with multi-plate lock-up clutch
✅ Valve body with precision shift solenoids and pressure regulators
✅ Integrated AWD transfer case / Power Take-Off (PTO) (U661F models only)
✅ Clutch packs, brake bands, and high-volume oil pump
✅ Input/Output speed sensors, range selector, and sealing gaskets

Note: Transmission mounts, shift cables, axles, rear driveshaft (for AWD), and external cooler lines may need to be transferred from the original unit.

Key Features:

✅ High-Torque Capacity: Specifically reinforced internal components to handle the 350 Nm peak torque of the 2.0L 8AR-FTS turbocharged engine without clutch slippage.
✅ 6-Speed Architecture: Provides a wider gear ratio spread for aggressive turbo-spooling acceleration and relaxed, low-RPM highway cruising.
✅ Multi-Gear Lock-Up: The torque converter lock-up clutch engages in multiple forward gears to reduce slippage, improve fuel economy, and lower transmission temperatures.
✅ AWD Capability (U661F): Features an integrated rear Power Take-Off (PTO) to seamlessly distribute torque to the rear wheels for enhanced traction in adverse conditions.
✅ Compact Transverse Packaging: Achieves high torque capacity in a space-efficient design, optimizing cabin and cargo space for mid-size SUVs and minivans.

Technical Notes:

Critical Installation Requirements:

Fluid Specification: Must use Toyota ATF WS (World Standard) exclusively. Using older ATF T-IV or incorrect fluids will cause severe shift issues, overheating, and internal clutch damage due to incompatible friction modifiers.
Fluid Level Check: Must be performed with the transmission at operating temperature (typically 70°C–80°C) and the engine idling, using the overflow check plug on the transmission pan.
ECU/TCM Reset: After installation, the ECU memory reset and shift adaptation learning must be performed using Toyota Techstream or equivalent diagnostic tools to ensure smooth gear transitions and proper line pressure.
Cooler Flushing: The transmission cooler (integrated into the radiator) and external lines must be thoroughly flushed to remove metallic debris and clutch material from the failed unit.
Transfer Case Mating (U661F): When mating the rear driveshaft to the PTO, ensure the output splines are properly aligned and lubricated with assembly grease to prevent binding.

Common Issues & Maintenance:

Valve Body / Solenoid Wear: High-mileage units may experience wear in the valve body sleeves or sticky solenoids, leading to harsh shifts or flaring. Regular fluid changes prevent abrasive debris buildup.
Torque Converter Shudder: A vibration felt at highway speeds during light throttle lock-up engagement can occur if the ATF WS fluid degrades. A complete fluid exchange or torque converter replacement resolves this.
AWD PTO Bearing Noise (U661F): Whining from the rear output may indicate bearing wear in the transfer case section. Keeping the shared ATF clean is critical to prevent this.
Fluid Service Intervals: A drain and fill every 60,000–80,000 km is strongly recommended to maintain shift quality, protect the lock-up clutch, and extend the lifespan of the U661 series, especially in turbocharged applications.