Here’s a description of the Mini Cooper F55 2.0 B48 6-speed automatic gearbox:

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Gearbox Overview

• Type: 6-speed automatic transmission
• Transmission Code: Aisin 6F21WA / TF-60SN (commonly paired with B48 engines)
• Manufacturer: Aisin Seiki (Japanese transmission supplier)
• Drive Type: Front-wheel drive (FWD)
• Shift Type: Torque converter automatic with manual sport mode and paddle shifters (optional)

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Technical Specs

• Number of gears: 6 forward, 1 reverse
• Torque handling: Up to ~350 Nm (varies slightly by calibration)
• Control: Electronic Transmission Control Unit (TCU) integrated with engine ECU
• Manual mode: Tiptronic-style gear selection, paddle shift (if equipped)
• Shift logic: Adaptive; learns driver behavior for smoother and sportier shifts

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Compatibility

• Found in:
  
• Mini Cooper S F55 (5-door hatchback)
• Mini Cooper S F56 (3-door hatchback)
• With 2.0L B48 turbocharged inline-4 engine
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Common Features

• Integrated oil cooler
• Low-viscosity ATF (often lifetime fill, but servicing is recommended around 60,000–80,000 km)
• Designed for performance and fuel efficiency balance

Let me know if you also need info about the 7-speed DCT found in later models or other drivetrain parts.