The automatic transmission assembly with reference numbers 35000-35B50 and 35000-35D00 is designed for the Toyota/Aisin A750E (and A750F for 4WD) 5-speed automatic transmission. Engineered for longitudinal engine layouts and heavy-duty applications, this robust unit is built to handle the high torque of V6, V8, and turbo-diesel engines in the Toyota Hilux, Land Cruiser Prado, 4Runner, and related off-road platforms.
Quick Specifications:
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Part Numbers: 35000-35B50 / 35000-35D00 (Toyota OEM format)
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Transmission Model: A750E (RWD) / A750F (4WD)
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Type: 5-Speed Automatic
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Configuration: Longitudinal Rear-Wheel Drive (RWD) / Four-Wheel Drive (4WD)
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Max Input Torque: ~400-500 Nm (Heavy-Duty Variant)
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Fluid Type: Toyota ATF WS (World Standard)
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Fluid Capacity: ~8.5 - 10.5 Liters (dry fill, varies by 2WD/4WD and cooler size)
Applications:
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Toyota Hilux / Vigo (2005-2015, 2.7L 2TR-FE, 4.0L 1GR-FE, 3.0L 1KD-FTV Diesel)
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Toyota Land Cruiser Prado 120 / 150 (4.0L V6 and 3.0L Diesel variants)
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Toyota 4Runner (2003-2009, 4.0L V6 and 4.7L V8 variants)
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Toyota FJ Cruiser (2007-2014, 4.0L 1GR-FE V6)
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Toyota Tacoma (2005-2015, 4.0L V6 variants)
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Toyota Fortuner / SW4 (Select V6 and Diesel variants)
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Lexus GX 470 (4.7L V8 variants sharing the A750 platform)
Complete Assembly Includes:
✅ Heavy-duty transmission case with reinforced bellhousing
✅ High-capacity torque converter with lock-up clutch
✅ Valve body with precision shift solenoids and pressure regulators
✅ Transmission Control Module (TCM) integration (often controlled by engine ECU)
✅ Planetary gear sets, clutch packs, and brake bands
✅ Oil pump, filter, speed sensors, and sealing gaskets
✅ Transfer case adapter housing (for 4WD A750F models)
Note: Transmission mounts, shift linkages, transfer case (if separate), driveshafts, and external cooler lines may need to be transferred from the original unit.
Key Features:
✅ Heavy-Duty Architecture: Specifically reinforced to withstand the extreme torque and thermal loads of off-road driving, towing, and turbo-diesel applications.
✅ Longitudinal Layout: Optimized for traditional body-on-frame SUVs and pickup trucks, providing excellent weight distribution and durability.
✅ Tow/Haul Mode: Shift logic adapts to heavy loads, holding lower gears longer to prevent excessive shifting and overheating.
✅ Lock-Up Clutch: Engages in multiple gears to reduce slippage, improve fuel economy, and lower transmission temperatures.
✅ Proven Reliability: The A750 series is widely regarded as one of the most durable and reliable automatic transmissions ever built by Toyota/Aisin.
Technical Notes:
Critical Installation Requirements:
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Fluid Specification: Must use Toyota ATF WS (World Standard) exclusively. Using older ATF T-IV or Dexron will cause severe shift issues, overheating, and internal damage due to incorrect friction modifiers and viscosity.
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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.
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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.
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Cooler Flushing: The transmission cooler (often integrated into the radiator) and external lines must be thoroughly flushed to remove metallic debris and clutch material from the failed unit.
Common Issues & Maintenance:
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Overheating: While robust, the A750E/F can run hot during heavy towing or slow off-roading. Installing an auxiliary transmission cooler is highly recommended for extreme use.
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Valve Body Wear: High-mileage units may experience wear in the valve body sleeves, leading to harsh shifts or delayed engagement. Regular fluid changes prevent debris buildup.
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Fluid Service: Despite Toyota's "lifetime" fluid claims, a drain and fill every 60,000–80,000 km is strongly recommended to maintain shift quality and extend the lifespan of the clutches and bands.