Order a Bespoke Gearbox Adapter Plate

Brightstone Engineering designs and manufactures gearbox adapter plates tailored to your exact engine, gearbox and bellhousing pattern. Every adapter is CNC machined in the UK from billet aluminium (6082-T6 or 7075-T6) to ensure accurate dowel location, reliable torque transfer, and OEM-grade fitment. If you need a gearbox adapter for a performance build, restoration or prototype, we’ll supply a made-to-measure adapter plate that’s ready to install.

Features & Specifications

• Precision CNC machined billet aluminium (6082-T6 or 7075-T6).
• Designed for ZF (including ZF 8HP), GS6, DCT and manual applications.
• Exact bolt pattern replication with tight-tolerance dowel alignment.
• Compatible with stock or custom flywheel, clutch and bellhousing setups.
• CAD-led design; optional 3D scanning of components for perfect adapter plate compatibility.
• Optional transmission adapter kit: plate, bolts, dowels, alignment pins and install guide.
• Black anodising available for corrosion resistance and professional finish.

Popular Applications

• BMW engine to ZF 8HP or GS6 gearbox (petrol & diesel).
• Toyota (e.g., JZ platform) to BMW gearbox adapter solutions.
• Nissan and Honda engine swap adapter projects for track or road.
• Classic restorations, prototype vehicles and specialist vehicle modifications.

Not listed? Send your measurements and we’ll confirm adapter plate compatibility for your configuration.

At Brightstone Engineering, our custom gearbox adapter plates are built to link almost any engine and gearbox combination you can imagine. Whether you need a bellhousing adapter plate, an engine swap adapter, or a complete gearbox-to-engine mating plate, each one is modelled in CAD and CNC-machined from billet aluminium for strength, accuracy and a perfect fit. We produce everything in-house here in the UK, including ZF gearbox adapter plates and manual-to-automatic gearbox conversion solutions for both road and motorsport use. If you’re working on something unusual or one-off, we can design a custom transmission adapter from scratch — ideal for prototype or race projects where nothing off the shelf will fit.

We’ve built gearbox adapter plates for all sorts of swaps, including BMW to Toyota, JZ to ZF 8HP, and Honda K-series conversions. We also handle BMW M57 gearbox conversions, LS swap adapters, and classic car gearbox adapters for restorations that deserve modern reliability. Our motorsport-grade adapters are designed to cope with serious torque while keeping perfect alignment between crank and input shaft. Whether it’s for a drift build, track car, or a lightweight aluminium adapter for a high-performance road car, every plate we make is machined with care and precision to the same standard we’d use on our own projects.

What We Supply

• Custom gearbox adapter plate machined to your engine/gearbox specs.
• Optional kit: high-grade bolts, dowels, alignment pins and hardware pack.
• Installation notes covering adapter plate installation and torque guidance.

How It Works

1. Send Details: Email engine & gearbox info (patterns, spacings, photos/drawings).
2. Scan / Measure: Provide your measurements or use our optional 3D scanning service.
3. CAD & Sign-off: We model the custom gearbox adapter plate and confirm before machining.
4. CNC Manufacture: Your adapter is machined in-house on our HAAS CNC for accuracy and repeatability.

Why Choose Brightstone Engineering

• UK manufacturer of custom gearbox adapter plates for swaps and conversions.
• In-house CAD/CAM and CNC machining with tight-tolerance alignment.
• Appropriate alloy selection (6082-T6 / 7075-T6) for strength, stiffness and durability.
• Clear support on adapter plate installation and practical fitment checks.

Fitment Notes

• Confirm bellhousing clearance, starter position and ring-gear engagement during mock-up.
• Verify clutch, flywheel and release system compatibility with the new stack height.
• Ensure correct input shaft support and pilot bearing solution where required.