Toyota Lexus

30500-0T021 30500-0E080 Toyota Highlander U660F Transmission

30500-0T021 30500-0E080 Toyota Highlander U660F Transmission

OE NO.:30500-0T021 30500-0E080
Model Number: U660F
Transmission Speeds:6
Gearbox Type: Automatic
Product description: Application: Toyota AWD Crossovers & Minivans: Highlander: 3.5L V6 2GR-FE AWD (2008 - 2016) Venza: 3.5L V6 2GR-FE AWD (2009 - 2016) RAV4: 3.5L V6 2GR-FE AWD (2007 - 2012) Sienna: 3.5L V6
INQUIRY

Model Number	U660F
MOQ	1 Pcs
Condition	Remanufactured
Warranty	6 Months

The automatic transmission assembly with reference numbers 30500-0T021 and 30500-0E080 is designed for the Aisin U660F 6-speed automatic transmission. As the All-Wheel Drive (AWD) counterpart to the U660E, this heavy-duty transverse unit features an integrated transfer case, specifically engineered to handle the high torque output of the 3.5L V6 (2GR-FE) engine in the Toyota Highlander, Venza, and related mid-size SUV platforms.

Quick Specifications:

Part Numbers: 30500-0T021 / 30500-0E080 (Toyota OEM format)
Transmission Model: U660F (6-Speed Automatic AWD)
Type: Transverse All-Wheel Drive (AWD)
Engine Compatibility: 3.5L V6 (2GR-FE / 2GR-FXE)
Max Input Torque: ~350-400 Nm
Fluid Type: Toyota ATF WS (World Standard)
Fluid Capacity: ~7.5 - 8.5 Liters (dry fill, slightly higher than FWD due to transfer case)

Applications:

Toyota Highlander (XU40 / XU50, 2007-2019, 3.5L V6 AWD variants)
Toyota Venza (AV10, 2008-2016, 3.5L V6 AWD variants)
Toyota Sienna (XL30 / XL40, select 3.5L V6 AWD variants)
Lexus RX350 (Select early AWD variants sharing the U660F platform)

Complete Assembly Includes:

✅ Heavy-duty 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) for rear driveshaft
✅ Clutch packs, brake bands, and high-volume oil pump
✅ Input/Output speed sensors, range selector, and sealing gaskets

Key Features:

✅ AWD Capability: Integrated transfer case seamlessly distributes torque to the rear wheels for enhanced traction in adverse weather and light off-road conditions.
✅ High-Torque Capacity: Reinforced internal components specifically designed to handle the 270+ HP and high torque output of the 3.5L 2GR-FE V6 engine without slipping.
✅ 6-Speed Architecture: Provides a wider gear ratio spread for aggressive 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.

Critical Installation Requirements:

Fluid Specification: Must use Toyota ATF WS (World Standard) exclusively. Using incorrect fluid will ruin the friction characteristics of the lock-up clutch and cause severe shudder.
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.
Transfer Case Alignment: When mating the rear driveshaft, ensure the transfer case output splines are properly aligned and lubricated with assembly grease to prevent binding.
ECU/TCM Reset: After installation, the ECU memory reset and shift adaptation learning must be performed using Toyota Techstream or equivalent diagnostic tools.
Cooler Flushing: The transmission cooler and external lines must be thoroughly flushed to remove metallic debris from the failed unit.

Common Issues & Maintenance:

Transfer Case/PTO Wear: Ensure the shared ATF is kept clean to prevent bearing and gear wear in the AWD transfer case unit. Listen for whining noises from the rear PTO, which can indicate low fluid or bearing wear.
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 can occur if the ATF WS fluid degrades and loses its friction modifiers. A fluid exchange or torque converter replacement resolves this.
Fluid Service Intervals: A drain and fill every 60,000–80,000 km is strongly recommended to maintain the health of the AWD transfer case, the lock-up clutch, and extend the lifespan of the U660F.