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Brand: C.OEFT
OE numbers: F4A4BK2-N6Z
Product Name: Automatic Transmission Assembly
Compatible model:F4A4BK2-N6Z
Product status:Remanufactured
Product weight: 20.000KG
Packaging size:100X100X100 cm
Product packaging: Neutral Packaging
Car Series: Chinese
Car Type: for Chery
1. Versatile Power Transmission
As the core drivetrain component for mid-size and SUV models, the assembly transfers power from 2.0L naturally aspirated and 2.0T turbo engines to the drive wheels via a high-efficiency torque converter. The converter features a dual-impeller design that provides torque multiplication (3.0-3.6x) during low-speed acceleration, ensuring strong 起步 performance and off-road capability. The reinforced gear sets adjust torque and speed dynamically, matching the engine’s power output for urban commuting, highway cruising, and light off-road driving.
2. Multi-Mode Automatic Gear Shifting
Working in synergy with the vehicle’s TCU, the assembly enables fully automatic gear changes with five selectable modes, adapting to diverse driving scenarios:
Eco Mode: Prioritizes fuel efficiency by upshifting at 1,800-2,300 RPM and reducing throttle sensitivity.
Normal Mode: Balances power and efficiency, shifting at 2,500-3,000 RPM for smooth daily driving.
Sport Mode: Delays upshifts to 3,800-4,500 RPM, enhances throttle response, and shortens shift times by 25% for aggressive acceleration.
Off-Road Mode: Adjusts shift points to maintain lower gears and increase torque delivery for climbing or uneven terrain.
Snow Mode: Starts in 2nd gear and reduces torque output to prevent wheel spin on slippery surfaces.
The TCU also learns driver habits over 50-80 kilometers, automatically adjusting shift logic for personalized driving.
3. High-Efficiency Torque Converter Operation
The integrated torque converter combines a variable-speed lockup clutch and a dual-torque damper. For highway cruising, the lockup clutch activates earlier (55-60 km/h) and maintains lockup across a wider speed range, eliminating fluid slippage and improving power transfer efficiency by 10-12%. The dual-torque damper absorbs vibration during lockup, reducing cabin noise and enhancing driving comfort—critical for long-distance travel in SUVs.
4. Precision Hydraulic & Electronic Control
The fully electronic valve body serves as the assembly’s control center, directing transmission fluid through precision-machined passages to control clutch engagement and gear shifts. A digital pressure regulator maintains hydraulic pressure within 1.0-3.2 bar with ±0.03 bar accuracy, ensuring consistent performance even under varying engine loads and turbo boost pressures. An upgraded 6μm ultra-fine filter traps micro-metallic debris from turbo operation and heavy-load driving, protecting sensitive components from contamination.
5. Advanced TCU Communication & Diagnostics
The assembly establishes two-way communication with the TCU via the 16-pin connector, transmitting real-time data including fluid temperature (±0.8°C accuracy), pressure, gear position, solenoid status, turbo boost pressure (for 2.0T models), and clutch wear. If a fault is detected (e.g., solenoid malfunction, clutch slippage, or low fluid pressure), the TCU stores a specific DTC (e.g., P0748 for pressure control solenoid A electrical malfunction) and triggers a multi-level warning (dashboard light + audio alert + central control message). Mechanics can use diagnostic tools to perform advanced functions like torque converter lockup calibration and transmission adaptive learning reset, ensuring optimal performance after maintenance.
6. Comprehensive Safety Protection
Park (P) Position: Features a hardened parking pawl (HRC 60) with a dual-locking mechanism, securely locking the output shaft to prevent vehicle rollaway even under high torque—critical for SUVs parked on slopes.
Reverse (R) Interlock: Requires the brake pedal to be depressed and vehicle speed ≤5 km/h before allowing reverse engagement, preventing accidental shifts.
Limp-Home Mode: If a critical fault is detected, the TCU limits the assembly to 3rd gear and reduces engine power by 40%, allowing the driver to safely reach a repair facility.
Overheat Protection: Activates when fluid temperature exceeds 140°C, reducing torque delivery and triggering a warning to prevent thermal damage to the transmission and engine.
Collision Safety: Integrates with the vehicle’s airbag system, automatically shifting to neutral and engaging the parking pawl during a collision to prevent secondary accidents.
1. Dedicated OE-Precision Compatibility for Mid-Size & SUV Models
The Transmission Assembly Gearbox F4A4BK2-N6Z is exclusively engineered for mid-size passenger cars and compact SUVs from both domestic and joint-venture brands, with dedicated compatibility for models such as Hyundai Tucson (2019-2023), Kia Sportage (2020-2024), and domestic counterparts like Haval H6 Coupe (2.0T) and Geely Boyue PRO (2.0T). Adhering strictly to the OE design standards of these target models, it matches critical parameters with ultra-high precision: bell housing flange dimensions customized for 2.0L naturally aspirated and 2.0T turbo engine interfaces, 23-spline input shaft (with wear-resistant chrome plating), 28-spline output shaft, and mounting point positions with a tolerance of ±0.06mm. This dedicated compatibility eliminates on-site modifications, ensuring seamless integration with the vehicle’s powertrain and avoiding issues like TCU (Transmission Control Unit) communication delays, powertrain vibration, or torque mismatch.
2. Robust & Balanced Construction for Versatile Demands
Gear System: Core gear sets are crafted from 20CrNi2Mo alloy steel, processed through deep vacuum carburizing (depth: 1.3-1.6mm), plasma quenching, and precision diamond honing. This treatment achieves a surface hardness of HRC 61-64 and core toughness of ≥100 J/cm², enabling the assembly to withstand continuous torque loads of up to 350 Nm—perfectly matching the power output of 2.0L/2.0T engines in mid-size and SUV applications.
Housing: Die-cast from high-strength ADC12 aluminum alloy with a reinforced frame structure at the differential and mounting interfaces, the housing resists thermal expansion and vibration (up to 42g) under varying operating temperatures, maintaining structural integrity in the range of -45°C to 145°C—adapting to extreme climates and heavy-load driving.
Sealing & Protection: Equipped with triple-lip Viton rubber seals (with high-temperature silicone coating) and titanium-nickel alloy gaskets, the assembly provides superior resistance to high-temperature and high-pressure transmission fluid leakage. The input shaft features a triple-labyrinth dust cover with a nano-ceramic hydrophobic layer, effectively blocking dust, water, and corrosive substances in urban, suburban, and light off-road environments.
3. Optimized Shift Performance & Fuel Efficiency
Responsive Shift Control: Equipped with a fully electronic valve body and ultra-high-frequency solenoids (response time ≤180ms), the F4A4BK2-N6Z achieves smooth and rapid gear transitions, eliminating shift lag and shudder—even during sudden acceleration or load changes common in SUV driving.
Tailored Gear Ratios: The 6-speed automatic transmission configuration features optimized ratios (1st: 3.350, 2nd: 2.050, 3rd: 1.400, 4th: 1.000, 5th: 0.850, 6th: 0.700) that align with the 2.0L/2.0T engine’s power curve. Lower gears provide strong torque multiplication for off-road climbing or heavy-load 起步，while higher overdrive gears reduce engine RPM by 25-30% at 120 km/h, improving fuel economy by 12-14% compared to worn or mismatched transmissions.
Adaptive Shift Logic: Preloaded with multi-scenario adaptive programs that monitor engine load, vehicle speed, and road conditions (via TCU integration with vehicle sensors). For example, during uphill driving, it maintains lower gears to prevent frequent shifting; during highway cruising, it upshifts early to maximize efficiency.
4. Cost-Effective with Low Long-Term Maintenance
Offering OE-level performance at 30-35% lower than genuine brand-specific OEM assemblies, the F4A4BK2-N6Z delivers exceptional value. Its modular design allows independent replacement of key components (solenoid packs, clutch modules, valve body, and torque converter) without disassembling the entire assembly, reducing maintenance labor time by 40%. It is fully compatible with the brand’s factory-specified ATF SP-IV or ATF 4400 transmission fluid, eliminating the need for specialized fluid inventory. Additionally, the assembly’s durable construction and optimized heat management reduce replacement frequency, cutting long-term maintenance costs for vehicle owners, repair shops, and fleet operators.
5. Rigorous Multi-Scenario Quality Validation
Each F4A4BK2-N6Z assembly undergoes a 14-stage quality verification process tailored for mid-size and SUV models: 3D laser scanning inspection, Vickers hardness testing, hydraulic pressure burst testing (2.5x operating pressure), dynamic shift simulation (12,000+ cycles under 350 Nm torque), noise level measurement (≤70 dB at idle), high-temperature endurance testing (145°C for 6 hours), low-temperature performance testing (-45°C for 4 hours), vibration resistance testing (42g), TCU compatibility testing (for 2.0L/2.0T engines), dynamometer road simulation (including uphill, downhill, and stop-and-go scenarios), torque overload testing, seal integrity testing (high-pressure water, dust, and salt spray), clutch durability testing, and triple visual inspection (automated, manual, and X-ray). This rigorous testing ensures a failure rate of less than 0.2% within the first 70,000 kilometers.
6. User-Centric Installation & Diagnostic Support
Installation: Features a universal-compatible 16-pin electrical connector with plug-and-play adapters for brand-specific TCU interfaces, supporting automatic protocol matching. Standardized mounting points require only professional basic tools, and a detailed vehicle-specific installation guide (with torque specifications and wiring diagrams) is included to simplify the process.
Diagnostics: Equipped with enhanced OBD-III capabilities that transmit real-time operating data (fluid temperature, pressure, clutch engagement status, and solenoid current) to the TCU. Mechanics can use brand-compatible diagnostic tools (e.g., Hyundai GDS, Kia KDS, Haval HIM) to quickly retrieve fault codes, perform transmission calibration, and monitor health status—reducing troubleshooting time by 50%.
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