BMW N54/N55/S55 to 8HP70 N57 Adapter Plate

Upgrade your BMW N54, N55, or S55 engine to a BMW 8HP70 N57 gearbox with this high-quality adapter plate. Designed for enthusiasts who have reached the torque limit of the 8HP45, this adapter enables a direct connection to the stronger 8HP70 transmission while maintaining OEM alignment and functionality.

Key Features

• Adapter plate to fit BMW N54, N55, or S55 engines with 8HP70 N57 transmission
• Maintains OEM flexplate length and torque converter position for 6HP compatibility
• Allows installation of an N55 8HP torque converter directly to the N55 flexplate
• High-grade aluminum construction with natural anodized finish for durability and premium feel
• Plate thickness: 17 mm
• S55 engines require a small hole drilled near the starter for torque converter bolt access
• Precise machining for perfect fitment and alignment

Installation Notes

• OEM N55 flexplate must be used with this adapter
• For N57 torque converter use, a new bolt pattern must be added (modification kit recommended)
• Ensures the N57 gearbox has the same length and torque converter position as the original 6HP setup

Why Choose This Adapter Plate?

• Upgrade from 8HP45 to 8HP70 for higher torque capacity
• Premium materials and finish for long-lasting reliability
• Maintains OEM geometry for seamless transmission integration
• Professional-grade solution for N54/N55/S55 engine swaps and performance builds

This adapter plate is ideal for BMW tuners, engine swap projects, and performance enthusiasts looking for a high-quality solution to fit an 8HP70 N57 transmission on N54, N55, or S55 engines.