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Brand: C.OEFT
OE numbers: 121000051AA
Product Name: Automatic Transmission Assembly
Compatible model:121000051AA
Product status:Remanufactured
Product weight: 20.000KG
Packaging size:100X100X100 cm
Product packaging: Neutral Packaging
Car Series: Chinese
Car Type: for Chery Tiggo 7 (T1E)
1. High-Torque Power Transmission & Versatile Torque Adjustment
As a core drivetrain component for multi-type vehicles, the assembly transfers power from 1.0T-1.8T turbo and 1.2L-1.8L NA engines to drive wheels via a high-performance torque converter. The converter features an optimized impeller design, providing torque multiplication (2.5-3.2x) during low-speed acceleration—effectively compensating for turbo lag in 1.8T models and ensuring strong 起步 power. The reinforced gear sets adjust torque and speed dynamically, adapting to urban commuting, highway cruising, and light off-road conditions.
2. Multi-Mode Adaptive Automatic Gear Shifting
Working in synergy with the vehicle’s TCU, the assembly 实现 intelligent automatic shifting by monitoring engine RPM, throttle position, vehicle speed, turbo boost pressure (for turbo models), and driver input. It supports three shift modes:
Eco Mode: Upshifts at 2,000-2,500 RPM to maximize fuel efficiency.
Normal Mode: Balances power and efficiency, shifting at 2,500-3,000 RPM.
Sport Mode: Delays upshifts to 3,500-4,000 RPM, maintaining turbo boost for aggressive acceleration.
It also adapts to driving styles, recognizing frequent throttle/brake inputs as sporty and adjusting shift logic accordingly.
3. High-Efficiency Torque Converter Operation
The upgraded torque converter retains the impeller-turbine-stator structure but integrates a variable-speed lockup clutch. For turbo models, the lockup clutch activates earlier (50-55 km/h) to eliminate fluid slippage, improving power transfer efficiency by 8-10%—3% higher than the 121000006AA. For NA models, it adjusts lockup timing based on load, balancing smoothness and efficiency.
4. Precision Hydraulic System Regulation
The electronic valve body serves as a high-precision control center, directing transmission fluid via optimized, enlarged passages to handle high-torque demands. A digital pressure regulator maintains hydraulic pressure within 0.8-2.8 bar with ±0.05 bar accuracy, ensuring consistent clutch engagement even under 280 Nm torque. An upgraded 8μm fine filter traps turbo-related metallic debris, while a high-pressure relief valve (max 3.5 bar) prevents overpressure damage in extreme acceleration scenarios.
5. Intelligent TCU Communication & Advanced Diagnostics
Connecting to the TCU via a 16-pin connector, the assembly transmits comprehensive real-time data: fluid temperature (high-precision NTC sensor, ±1°C accuracy), gear position, solenoid current, turbo boost pressure, clutch engagement status, and fluid quality. If faults are detected (e.g., solenoid short circuit, clutch slippage), the TCU stores specific DTCs (e.g., P0758 for shift solenoid B electrical malfunction) and triggers a visual/audio warning. Mechanics can use universal tools (Launch X431, Autel MaxiSys) to retrieve detailed fault data, including historical operating parameters, for targeted troubleshooting.
6. Comprehensive Safety Protection Features
Park (P) Position: Upgraded parking pawl with tungsten-carbide coated teeth (HRC 62) and a dual-locking mechanism, ensuring secure locking even under 280 Nm torque—preventing rollaway risks for high-torque models.
Reverse (R) Interlock: Requires brake pedal depression, electronic key verification, and turbo boost pressure ≤0.2 bar (for turbo models) to prevent accidental reverse engagement during turbo spool-up.
Intelligent Limp-Home Mode: If a critical fault is detected, the TCU limits the assembly to 2nd gear, reduces turbo boost pressure to 0.4 bar (for turbo models), and prioritizes transmission cooling—protecting both the transmission and engine while allowing safe travel to a repair facility.
Overheat Protection: Activates when fluid temperature exceeds 135°C, reducing engine power and triggering a warning to prevent thermal damage.
1. Wide-Range OE-Precision Compatibility for Multiple Vehicle Types
Building on the 121000006AA’s compatibility, the 121000051AA Transmission Assembly Gearbox further expands its application scope, covering compact, subcompact, and entry-level mid-size vehicles equipped with 1.0T-1.8T turbocharged and 1.2L-1.8L naturally aspirated (NA) engines. It is fully compatible with domestic models such as Chery Tiggo 5x, Changan UNI-V, Great Wall Haval H2, and entry-level joint-venture models including Volkswagen Lavida (1.4T), Honda Civic (1.5T, China-spec), and Toyota Corolla Cross (1.8L hybrid auxiliary transmission). Adhering to premium OE standards, it supports 4-bolt/6-bolt dual bell housing patterns, 18-spline/20-spline/22-spline input shafts, and 24-spline/27-spline output shafts, with an ultra-tight tolerance of ±0.08mm. This wide-range precision compatibility eliminates modification needs across diverse platforms, avoiding powertrain misalignment, TCU (Transmission Control Unit) communication latency, or torque mismatch issues.
2. Premium Reinforced Construction for High-Torque Durability
Gear System: Upgraded from 20CrNiMo to 18CrNiMo7-6 alloy steel, the gear sets undergo deep vacuum carburizing (depth: 1.2-1.6mm), high-frequency quenching, and precision honing, achieving a surface hardness of HRC 60-64 and core toughness of ≥95 J/cm². This enables the assembly to withstand continuous torque loads of up to 280 Nm—27% higher than the 121000006AA—perfectly matching the power output of 1.8T high-performance turbo engines.
Housing: Die-cast from high-strength ADC12 aluminum alloy with a carbon fiber composite reinforcement layer at stress points, the housing resists vibration (up to 40g) and thermal deformation, maintaining structural integrity in extreme temperatures ranging from -45°C to 140°C—adapting to frigid northern winters, scorching southern summers, and high-heat turbo operating environments.
Sealing & Protection: Equipped with triple-lip Viton rubber seals (upgraded from double-lip) and titanium-plated stainless steel gaskets, it provides industry-leading leakage resistance. The input shaft features a dual-labyrinth dust cover with a hydrophobic coating, effectively blocking dust, water vapor, and fine particles, ensuring reliability in off-road, rainy, or dusty conditions.
3. High-Performance Shift & Superior Fuel Efficiency
Shift Response: Equipped with a fully recalibrated electronic valve body and high-frequency solenoids (response time ≤200ms—20% faster than 121000006AA), the 121000051AA achieves seamless gear transitions, eliminating shift shudder and lag even under rapid torque fluctuations of 1.8T engines.
Gear Ratios: Optimized 5-speed automatic configuration (1st 3.200, 2nd 1.900, 3rd 1.200, 4th 0.900, 5th 0.680) tailored for high-torque turbo engines. The 5th overdrive gear reduces engine RPM by 20-25% at 120 km/h, improving fuel economy by 9-12% compared to worn transmissions—2-3% higher than the 121000006AA.
Adaptive Logic: Preloaded with multi-mode shift programs (Eco, Normal, Sport), allowing drivers to switch based on scenarios—Sport mode delays upshifts for aggressive acceleration, while Eco mode prioritizes early upshifts for efficiency.
4. Cost-Effective with Long-Term Value
Priced only 15-20% higher than the 121000006AA but offering 30% broader compatibility and 27% higher torque capacity, the 121000051AA delivers exceptional cost-effectiveness. Its advanced modular design supports independent replacement of not only solenoids and clutch packs but also electronic valve body components, cutting maintenance labor time by 35%. It is compatible with a wide range of transmission fluids (ATF 3309, ATF WS, ATF 4400) and supports extended-life (100,000km) oil filters, reducing long-term maintenance costs by 25%.
5. Rigorous Premium Quality Testing
Each assembly undergoes a 12-stage quality verification process (adding hybrid compatibility and extreme torque tests to the 121000006AA’s 10 stages): static dimensional inspection (3D scanning), component hardness testing (Vickers hardness meter), hydraulic pressure leak testing (2x operating pressure), dynamic shift simulation (8,000+ cycles under 280 Nm torque), noise level measurement (≤72 dB at idle), extreme temperature endurance testing (-45°C to 140°C cycling), vibration resistance testing (40g), TCU compatibility testing (NA/turbo/hybrid), road simulation on dynamometers (1.8T engine emulation), torque capacity testing, seal integrity testing (high-pressure water spray), and final visual inspection. This ensures a failure rate of less than 0.3% within the first 60,000 kilometers.
6. Intelligent Installation & Maintenance Support
Installation: Features a universal 16-pin electrical connector with plug-and-play adapters for 12-pin/14-pin TCU interfaces, supporting automatic identification of vehicle models via TCU communication. Standardized mounting points require only basic tools, with a quick-install guide included for mechanics.
Maintenance: Equipped with a digital oil level sensor (optional) that transmits real-time fluid status to the vehicle’s infotainment system. The easily accessible filter and dipstick simplify routine maintenance, while built-in diagnostic ports support direct connection to universal tools for fault analysis—reducing service time by 40%.
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