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Brand: C.OEFT
OE numbers: 121000006AA
Product Name: Automatic Transmission Assembly
Compatible model:121000006AA
Product status:Remanufactured
Product weight: 20.000KG
Packaging size:100X100X100 cm
Product packaging: Neutral Packaging
Car Series: Chinese
Car Type: for Chery Tiggo 8 T18 and Chery Tiggo 8
1. Versatile Power Transmission & Torque Adjustment
As a core drivetrain component, it transfers power from 1.0L-1.6L NA and 1.0T-1.2T turbo engines to drive wheels via an upgraded torque converter. The converter provides torque multiplication (2.2-2.8x) during low-speed acceleration, compensating for turbo lag and ensuring sufficient power. Gear sets adjust torque and speed for urban, highway, and light load conditions.
2. Adaptive Automatic Gear Shifting
Working with the vehicle’s TCU, it enables automatic shifting by monitoring engine RPM, throttle position, vehicle speed, and turbo boost pressure (for turbo models). For NA engines, it upshifts early for efficiency; for turbo engines, it delays upshifts during boost to maximize power. It adapts to driving styles, recognizing aggressive acceleration for sportier shifts.
3. Upgraded Torque Converter Operation
The torque converter retains impeller, turbine, and stator but with an optimized stator design for better torque multiplication. For turbo models, it activates the lockup clutch earlier (55-60 km/h) to eliminate slippage, improving efficiency by 5-7%—higher than 121000000AA.
4. Enhanced Hydraulic System Regulation
The valve body acts as a refined control center, directing fluid via optimized passages. A high-precision pressure regulator maintains pressure within 0.6-2.2 bar for consistent clutch engagement. An upgraded pressure relief valve prevents overpressure, and a 10μm fine filter traps debris, protecting components—especially critical for turbo engines.
5. Advanced TCU Communication & Diagnostics
Connecting to the TCU via a 12-pin connector, it transmits extended data: fluid temperature (via high-precision NTC sensor), gear position, solenoid status, and boost pressure (for turbo models). If faults occur (e.g., solenoid delay, low pressure), the TCU stores specific DTCs (e.g., P0741 for torque converter clutch stuck off) and illuminates the warning light. Mechanics use universal tools (e.g., Launch X431) for troubleshooting.
6. Improved Safety Features
Park (P) Position: Upgraded parking pawl with hardened teeth (HRC 60) for secure locking, suitable for higher torque from turbo engines.
Reverse (R) Interlock: Requires brake pedal depression and adds electronic verification to prevent engagement during turbo spool-down.
Enhanced Limp-Home Mode: Limits to 2nd gear and, for turbo models, reduces boost pressure to 0.5 bar, protecting the transmission and turbocharger while ensuring safe travel to a repair shop.
1. Enhanced OE-Grade Compatibility for Compact & Subcompact Vehicles
The Transmission Assembly Gearbox 121000006AA builds on the 121000000AA’s versatility with expanded compatibility, covering not only compact cars but also subcompact models equipped with 1.0L-1.6L naturally aspirated and 1.0T-1.2T turbocharged engines. It is compatible with domestic brands including Chery Arrizo 5, Changan Eado, Great Wall Haval H1, and even some entry-level 合资 models like Volkswagen Polo (China-spec) and Honda Fit. Adhering to upgraded OE standards, it matches diverse parameters: 6-bolt and optional 4-bolt bell housing patterns, 18-spline/20-spline input shafts, and 24-spline output shafts, with a tighter tolerance of ±0.1mm. This enhanced compatibility eliminates modification needs across more platforms, avoiding powertrain misalignment or TCU communication issues.
2. Reinforced Construction for Extended Durability
Gear System: Upgraded from 20CrMnTi to 20CrNiMo alloy steel, the gear sets undergo vacuum carburizing, quenching, and precision grinding, achieving a surface hardness of HRC 58-62 and core toughness of ≥90 J/cm². This enables it to withstand continuous torque loads of up to 220 Nm, suitable for both naturally aspirated and small turbocharged engines.
Housing: Die-cast from ADC12 aluminum alloy (superior to ADC10) with additional reinforcing ribs at high-stress areas, the housing resists vibration (up to 35g) and thermal expansion, maintaining integrity in temperatures ranging from -40°C to 130°C—adapting to harsher climates and turbocharged engine heat.
Sealing & Protection: Equipped with double-lip Viton rubber seals (replacing nitrile rubber) and stainless steel gaskets with anti-corrosion coating, it provides superior leakage resistance. An upgraded labyrinth-style dust cover on the input shaft blocks fine debris, enhancing durability in dusty environments.
3. Improved Shift Performance & Fuel Efficiency
Featuring a recalibrated valve body and high-response solenoids (response time ≤250ms, 17% faster than 121000000AA), the 121000006AA delivers smoother, quicker gear transitions, eliminating shift shudder. Its 4-speed automatic configuration retains practicality but with optimized gear ratios (1st 3.100, 2nd 1.800, 3rd 1.050, 4th 0.720) to suit turbocharged engines. The 4th overdrive gear reduces engine RPM by 15-20% at 100 km/h, improving fuel economy by 7-9% compared to worn transmissions—1-2% higher than 121000000AA.
4. Cost-Effective with Enhanced Value
Priced only 10-15% higher than 121000000AA but offering broader compatibility and better performance, it provides exceptional value. The modular design allows easy replacement of solenoids, clutch packs, and valve bodies, cutting maintenance labor time by 30%. It is compatible with common fluids (ATF 3309, ATF WS) and supports optional extended-life filters, reducing long-term costs.
5. Rigorous Upgraded Quality Testing
Each assembly undergoes a 10-stage quality verification process (adding turbo compatibility and high-pressure tests to 121000000AA’s 8 stages): static dimensional inspection, component hardness testing, hydraulic pressure leak testing (1.5x operating pressure), dynamic shift simulation (5,000+ cycles), noise level measurement (≤75 dB at idle), high-temperature endurance testing (130°C for 4 hours), vibration resistance testing, TCU compatibility testing (for both NA and turbo engines), road simulation on dynamometers, and final visual inspection. This ensures a failure rate of less than 0.6% within the first 50,000 kilometers.
6. User-Friendly Installation & Maintenance
Retaining simplicity, it features a universal 12-pin electrical connector with optional adapters for different models. Mounting points are standardized, requiring only basic tools. Maintenance is eased by a visible transmission fluid dipstick, accessible filter, and optional oil level sensor for real-time monitoring—reducing service complexity.
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