BMW M8 G16 Gran Coupe Gearbox 9504847
For the BMW M8 Gran Coupe (G16/F93), the gearbox identified by part number 9504847 is the high-performance 8-speed M Steptronic automatic transmission. This unit is the GA8X76AZ (also known as the ZF 8HP76), specifically engineered to handle the massive torque of the 4.4L S63 twin-turbo V8 engine.
1. Transmission Specifications (9504847)
This gearbox is the “Competition” spec unit, shared between the M8 (F91/F92/F93) and the M5 (F90).
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Model Code: GA8X76AZ (M-Steptronic)
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Base Unit: ZF 8HP76
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Torque Rating: Rated for a factory peak of 750 Nm (553 lb-ft), with a high safety margin for the M8 Competition’s 625 HP output.
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Drive Type: Designed for the M xDrive all-wheel-drive system, featuring an integrated connection for the transfer case.
2. Complete Gearbox Package Components
When sourcing a “Complete” gearbox under this part number, especially from 2022–2024 models, the assembly typically includes:
| Component | Technical Detail |
| Main Housing | The reinforced 8HP76 casing. |
| Mechatronics (TCU) | The internal electronic control unit with M-specific shift logic. |
| Torque Converter | High-performance fluid coupler tuned for S63 engine response. |
| Aluminum Oil Pan | Structural pan designed for high-G cornering and better heat dissipation. |
| Wiring Harness | The primary 13-pin (or equivalent) connector for the vehicle’s CAN-bus. |
3. Compatibility & Fitment
Part number 9504847 is highly versatile across the top-tier BMW M fleet. It is a direct fit for:
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M8 Gran Coupe (G16 / F93): 2020–2025+
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M8 Coupe/Convertible (F91 / F92): 2019–2025+
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M5 Sedan (F90 / F90 LCI): 2021–2024 (Often found in Competition and CS models)
4. Technical Notes for Replacement
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ISN Matching (Immobilizer): This gearbox is part of the vehicle’s anti-theft system. If you are installing a used unit, the Individual Serial Number (ISN) must be synchronized with your car’s DME (Engine ECU) and BDC (Body Controller) using specialized tools like Autohex or via a FEMTO-style unlock.
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Oil Grade: This unit requires BMW ATF 3+ (or ZF Lifeguard 9). Using the older ZF Lifeguard 8 or standard ATF can lead to clutch chatter and solenoid failure.
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Transfer Case: Note that the transfer case (ATC13-1) is often bolted to the rear of this unit but is technically a separate part number. Ensure your “Complete Package” specifies if the transfer case is included.
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