BMW F34 320i GT 8HP45 Automatic Gearbox | 3 Series N20 8-Speed Transmission

Description

Restore the legendary acceleration profile, seamless highway cruising gear splits, and optimum fuel efficiency of your premium fastback with this high-grade BMW N20 320i Gran Turismo 8HP45 Automatic Gearbox Assembly (ZF 8-Speed Electronic Torque-Converter Transmission). Specifically sourced and calibrated for the unique F34 3 Series GT platform equipped with the N20 2.0-liter twin-scroll turbocharged petrol engine (produced from 2013 through to early 2019), this genuine factory-style transmission unit is the definitive replacement for gearboxes suffering from planetary gear failure, clutch pack burnout, severe internal oil-pump scoring, or terminal mechatronic unit errors.

Please take note of the highly advanced engineering configuration: the ZF 8HP45 transmission is a state-of-the-art automatic system that coordinates directly with your vehicle’s central powertrain computers through an integrated Mechatronic control unit. Because this gearbox utilizes a complex network of solenoids, adaptive pressure sensors, and an internal electronic control module ($TCU$), running the vehicle with low or old transmission fluid can cause localized overheating, leading to clutch slippage, harsh gear shifts, or an immediate dash warning signaling transmission “Limp Mode.” Sourcing this dedicated, workshop-tested N20 F34 assembly ensures that your bellhousing bolt patterns, oil cooler line positions, and torque converter dimensions line up with absolute factory accuracy.

The automatic transmission works under extreme thermal and hydraulic pressures. Over years of spirited driving, the internal friction plates wear down, releasing microscopic particles into the transmission oil. If the integrated plastic sump filter becomes clogged, it restricts the high-pressure fluid flow required to actuate the clutch packs smoothly. This leads to chronic slipping between gears, delayed engagements, or severe shuddering when moving off from a standstill.

Attempting a partial repair on a completely burned-out or heavily contaminated transmission can result in lingering metal debris ruining your newly replaced parts. Swapping out the complete transmission assembly with this workshop-verified factory unit replaces all internal mechanical components simultaneously, instantly restoring rapid, crisp gear adaptations and eliminating destructive driveline vibrations.

Manufactured with a high-strength aluminum alloy casing to maximize heat dissipation and withstand high drivetrain torque loads, this 8HP45 assembly arrives thoroughly drained, cleaned, and pressure-tested. Trust TP German Auto Spares for fully verified, workshop-inspected BMW automatic transmissions, transfer cases, differentials, prop-shafts, and internal engine components that maintain the ultimate driving machine performance of your 3 Series GT.

Technical & Programming Note: This transmission assembly is supplied complete with its internal mechatronic valve body and matching torque converter. Because modern BMW gearboxes utilize the advanced Electronic Transmission Control (EGS) system, which binds the unit to the vehicle’s immobilizer and engine management system ($DME$), your installing technician will need to perform an electronic alignment, software synchronization, and oil adaptation reset using a professional diagnostic tool during installation.

Key Features:

• Vehicle & Engine Compatibility: Tailor-fit exclusively for BMW 3 Series 320i GT variants (F34 Gran Turismo platform) running the 2.0L N20 turbo petrol engine produced from 2012 through to 2019.

• ZF 8-Speed Architecture: Delivers rapid gear adaptation profiles, keeping the turbocharger inside its optimum power band while reducing highway revs for fuel optimization.

• Workshop Pressure Tested: Put through rigorous internal hydraulic valve and gear engagement testing to guarantee complete oil sealing and smooth up/down shifting lines.

• Flawless Output Shaft Flange: The rear output drive flange and front input torque converter splines are inspected under magnification to ensure zero teeth wear or alignment distortion.

• Clean Diagnostic Scan: The integrated internal electronic mechatronic module is scanned to ensure zero stored solenoid failures, speed sensor faults, or permanent trouble codes ($DTCs$).

• Condition: Excellent low-mileage used factory unit; thoroughly case-cleaned, mechanically balanced, benchmark-verified, and ready for installation.