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Brand: C.OEFT
OE numbers: U440
Product Name: Transmission Assembly
Compatible model: U440
Product status: NEW
Product weight：120KG
Packaging size: 100*100*100cm
Product packaging: Neutral Packaging
Car Series: Chinese
Car Type: For Changan
1. Four-Speed Transmission with Optimized Torque Ratios
As a four-speed automatic transmission, the U440E’s ratio range (0.700-2.800) balances performance and efficiency for mid-size vehicles:
1st gear (2.800:1): Amplifies torque for off-road climbing (e.g., the Toyota 4Runner ascending 30° slopes)
2nd gear (1.530:1): Delivers responsive overtaking power at speeds of 60-80 km/h
3rd gear (1.000:1): Maintains an engine speed of 2500 rpm at 100 km/h for highway cruising
4th gear (0.700:1): Reduces engine speed to 2100 rpm at 120 km/h, cutting fuel consumption by 12%
The 240 mm diameter torque converter adopts a three-element design with a lock-up clutch, softening power input during cold starts to protect the powertrain. In the 3.0L Lexus ES300, it transmits 280 N·m of torque via 1st gear, enabling 0-100 km/h acceleration in 7.8 seconds.
2. Adaptive Control and Comprehensive Fault Protection
The U440E’s Transmission Control Module (TCM) integrates driving style recognition and real-time condition monitoring (tracking 16 key parameters, compared to 12 in the 81-40). It automatically adjusts shift logic based on driving scenarios:
Eco Mode: Upshifts at 2000 rpm to keep the engine in its efficient operating range, reducing urban fuel consumption by 10%
Power Mode: Delays upshifts to 4000 rpm for sporty acceleration, ideal for mountain road driving
Off-Road Mode: Locks the transmission in 1st/2nd gears to prevent unwanted upshifts on rough terrain
For fault protection:
Over-Temperature Safeguard: Triggers a dashboard warning when the clutch temperature exceeds 130°C, and limits the transmission to 3rd gear when the temperature reaches 140°C to avoid clutch burnout
Limp Mode: Maintains 2nd gear and reverse if solenoid failure occurs (e.g., fault code P0755 for S2 solenoid failure), ensuring safe vehicle towing
Pressure Monitoring: Detects low oil pressure (fault code P0868) and reduces engine power to prevent metal-to-metal wear
1. Longitudinal Layout Adaptability for Mid-Size Vehicle Platforms
The U440 transmission assembly (with the U440E as its representative model) is specifically developed for longitudinal-engine rear-wheel-drive (RWD) and all-wheel-drive (AWD) mid-size vehicles, bridging the market gap between small-car front-wheel-drive (FWD) transmissions like the 81-40 and heavy-duty commercial gearboxes. Its integrated structure weighs 78 kg, striking a balance between structural rigidity and weight efficiency—it is 12% lighter than the earlier A340E transmission while withstanding 30% higher torque. The housing is made of die-cast aluminum alloy, with reinforcing ribs at the bell housing connection, enabling it to resist a maximum internal pressure of 22.3 kg/cm² during stall tests (surpassing the 81-40’s 18.6 kg/cm²). This design makes it ideal for models such as the Toyota Camry (XV30), Lexus ES300, and Toyota 4Runner, optimizing rear axle load distribution to ensure stable handling on highways.
2. Enhanced Electro-Hydraulic Control for Dynamic Shifting
Building on Toyota’s mature electronic control technology, the U440E is equipped with a six-solenoid electro-hydraulic system (S1-S4, SL, SLT), enabling more precise shift control than the 81-40’s five-solenoid configuration. The SLT pressure control solenoid adjusts line pressure between 4.1-12.5 kg/cm² based on engine load and vehicle speed, eliminating clutch slippage even during full-throttle acceleration. A key upgrade is the early engagement of the lock-up clutch—it activates in 3rd gear (compared to 4th gear in the 81-40), reducing torque converter slip by 65% and improving transmission efficiency by 11-14% at medium speeds. Third-party tests confirm that the shift time between 3rd and 4th gear is 0.28 seconds, with shift shock reduced by 45% compared to mechanical systems, delivering smoother acceleration for V6-powered models.
3. High-Torque Durability for Performance Applications
Targeting 2.0L-3.0L high-output engines, the U440E uses high-quality materials to handle a maximum input torque of 280 N·m (nearly double the 81-40’s 150 N·m). Gears and shafts are forged from 20CrMnTi alloy steel and undergo carburizing treatment, achieving a surface hardness of HRC 60-63 and a core toughness of 1500 MPa—effectively resisting wear during high-torque starts. The front and rear planet carriers are made of reinforced aluminum alloy with integrated bearing seats, passing 1500-hour high-low temperature cycle tests (-45°C to 130°C) without deformation. Friction plates adopt carbon-fiber composite materials compatible with Toyota T-IV (JWS-3309) transmission oil, doubling their service life compared to organic plates. Under normal maintenance (with oil changes every 80,000 km), the U440E achieves a service life of 350,000 km on Toyota 4Runner models.
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