Gearbox adapter kit designed to connect BMW M57N / M57N2 engines with aluminium blocks and large bellhousings to newer ZF 8HP 8-speed automatic transmissions. Suitable for engine conversion projects requiring a different BMW transmission.
Features
- CNC-machined aluminium gearbox adapter plate
- Compatible with ZF 8HP automatic transmissions featuring a 6-bolt torque converter mounting pattern
- Supports ZF 8HP transmissions in rear-wheel-drive and xDrive configurations
- Allows the original ZF 8HP torque converter to be used without an additional torque converter adapter plate
Specifications
- Material: Aluminium
- Adapter thickness: 15 mm
- Transmission configuration: ZF 8HP, 8-speed automatic, 6-bolt torque converter
Compatibility
BMW M57N engines:
- M57TUD30 - 218 HP
- M57TUD30 535d - 272 HP
- M57T2D25 - 197 HP
- M57T2D30 - 231 HP
BMW M57N2 engines:
- 306D3 - 235 HP
- 306D4 - power output not specified by manufacturer
- 306D5 - 286 HP
Important: This adapter is intended for M57N / M57N2 engines with the large bellhousing configuration. It is not intended for first-generation M57 engines with the smaller bellhousing configuration or the 204 HP M57N 306D2 EU3 variant. Verify the exact engine code and gearbox configuration before ordering.
Package Contents
- 1x Aluminium gearbox adapter plate
- Gearbox adapter mounting bolts
Installation
For ZF 8HP automatic transmissions:
- Uses the original ZF 8HP gearbox torque converter with 6 mounting points
- Required flexplate / starter ring gear: BMW OE 11 22 8 506 670 / 11 22 8 612 144, not included
- No additional torque converter adapter plate is required
General installation requirements:
- Starter motor: Original BMW M57N / M57N2, not included
- Starter OE references: 12 41 2 155 827; 12 41 2 344 232; 12 41 7 788 680; 12 41 7 788 682
- Grinding of the original starter motor housing is required
- Depending on the vehicle, modifications to engine and gearbox mounts, transmission tunnel, firewall or driveshaft length may be required
Important: This kit provides the mechanical connection between the engine and gearbox. It is not a complete conversion solution and does not include vehicle-specific modifications, drivetrain integration or the electronic transmission control system.
Important: Intended for motorsport use. The manufacturer recommends installation by professionals experienced in engine and transmission conversions, using suitable tools and workshop equipment.