PMC Motorsport adapter plate / conversion kit / clutch kit Mercedes-Benz M113 M113K V8 – 6-speed manual BMW N54 ZF GS6-53BZ 135i 335i 535i – 184 mm / 7.25" POT (Ultralight Race)

Important: Before purchasing, please check the part number of the automatic flexplate (ring gear) on your Mercedes-Benz engine. M113 engines were produced with two different flexplate variants – this adapter is compatible exclusively with Mercedes-Benz OE A2730300312 flexplate.

Adapter plate engineered for engine swap / conversion of the Mercedes-Benz M113 / M113K V8 (4.3, 5.0, 5.4, and 5.4 Kompressor AMG) engine with the ZF GS6-53BZ 6-speed manual gearbox sourced from BMW N54 engines (E8x 135i, E9x 335i, E60 LCI 535i, Z4 35i), including xDrive version GS6X53BZ HGY. Kit with an Ultralight Race flywheel for 184 mm (7.25") POT-type multi-disc clutches – an ideal solution for drifting as well as amateur and professional motorsport.

Planning a Mercedes-Benz M113 engine swap into your BMW (E30, E36, E46, E34, E39, E90, E91, E92, E60, E61, E81, E82, E87)? Our adapter plate is a reliable solution. Replace the automatic transmission with a BMW manual gearbox and unlock new potential.

PMC Motorsport adapter plates not only provide an automatic-to-manual conversion for cars equipped with Mercedes-Benz M113 engines, but also facilitate M113 swaps into BMW and other platforms such as Nissan (S13, S14, S15, PS13) or Mazda RX-7 / RX-8.

Aluminum gearbox adapter plate engineered to make gearbox installation as straightforward as possible without radical modifications such as cutting the bellhousing – only an opening for the starter needs to be prepared. Custom flywheels dedicated to PMC Motorsport adapters are made from lightweight aluminum with a replaceable friction surface, fully inspected and dynamically balanced prior to dispatch. Ultralight Race flywheel designed for 184 mm (7.25") POT-type clutches – modeled after Tilton OT-II Cerametallic 7.25" pressure plates in twin-disc (66-312xxx) and triple-disc (66-013xxx) configurations. Adapter plate thickness: 20 mm (0.78"). The small clutch diameter and low rotational mass provide lightning-fast throttle response.

PMC Motorsport gearbox adapter plates are synonymous with precision and premium quality. Our design process relies on 3D laser scanning and coordinate measuring arm inspection to guarantee an exact fit. CNC manufacturing ensures flawless concentricity and alignment between the engine and transmission, which is critical for drivetrain longevity.

Additional Information

Installation Instructions

Installing the flywheel requires using an automatic flexplate (ring gear) Mercedes-Benz OE A2730300312 (not included). Crankshaft bolts are included in the kit. The release bearing and clutch fork remain from your gearbox – if using a dual-position release bearing, use the 28.5 mm position. The gearbox guide tube (BMW OE 23 11 7 501 714) must be shortened – according to the graphic below. An original Mercedes-Benz M113 starter motor must be used (OE, not included).

Frequently Asked Questions

Which engines are compatible with this adapter?

Mercedes-Benz M113 V8 engines: 4.3, 5.0, 5.4, and M113K 5.4 Kompressor – working in conjunction with the automatic flexplate (ring gear) Mercedes-Benz OE A2730300312. M113 engines were produced with two flexplate variants; therefore, please verify the part number on your engine before ordering.

Which gearboxes are compatible with this adapter?

BMW 6-speed manual ZF GS6-53BZ transmissions from BMW N54 engines in HGX (THGX) – E9x 335i and E60 LCI 535i, JGD (TJGD) – E9x 335i, JGK (TJGK) – E82 / E88 135i and Z4 E89 35i – as well as xDrive versions GS6X53BZ HGY (THGY). Input shaft spline: 32.5x35-26N.

Is it necessary to cut or modify the gearbox bellhousing?

No. The adapter is specifically engineered to prevent cutting the bellhousing – only an opening for the starter needs to be prepared.

What additional parts are required for installation?

The automatic flexplate (ring gear) Mercedes-Benz OE A2730300312 and an OEM Mercedes-Benz M113 starter motor (OE). You also need a 184 mm (7.25") POT-type clutch assembly with 32.5x35-26N discs and a clutch slave cylinder dedicated to the GS6-53BZ gearbox – the release bearing and clutch fork are retained from your gearbox. These components are not included in the kit.

Which clutch fits the PMC flywheel?

The Ultralight Race flywheel is designed for 184 mm (7.25") POT-type clutches. It was modeled after Tilton OT-II Cerametallic 7.25" pressure plates – twin-disc 66-312xxx and triple-disc 66-013xxx. Other clutches meeting Tilton dimensional standards will also fit. The clutch discs must have 32.5x35-26N splines (26 teeth) matching the GS6-53BZ gearbox – e.g., Tilton 64185-8-VV-55 (twin-disc) or Tilton 64185-4-VTV-55 (triple-disc). The pressure plate, clutch discs, release bearing, clutch fork, and clutch slave cylinder are not included in the kit.

Does the gearbox require modification?

Yes. When installing a 184 mm clutch, the gearbox guide tube (BMW OE 23 11 7 501 714) must be shortened; if using a dual-position release bearing, it must be set to the 28.5 mm position. The procedure is shown in the graphic in the "Installation Instructions" section.

Is this kit suitable for a daily driver?

No. The Ultralight Race flywheel with a 7.25" multi-disc clutch is strictly intended for motorsport and drifting. For a vehicle used on a daily basis, we recommend the adapter version with a flywheel for a 240 mm BMW pressure plate.

Which starter motor should be used?

An original Mercedes-Benz M113 (OE) starter motor. The starter motor is not included in the kit.

Is this adapter also compatible with the ZF 8HP automatic transmission?

Yes. The PMC Motorsport adapter plate is universal and fits most BMW transmissions (applies to adapter plates manufactured after 2022). When converting to a ZF 8HP automatic transmission, the standard flywheel is simply replaced with a PMC Motorsport 8HP torque converter adapter.

What does the kit include?

An aluminum gearbox adapter plate with mounting bolts, custom PMC Motorsport Ultralight Race 184 mm flywheel with replaceable friction surface, crankshaft bolts, and pressure plate bolts. The clutch assembly, release bearing, clutch fork, and slave cylinder are not included – they should be selected to match your specific gearbox.

Can I purchase only the adapter plate or only the flywheel?

Yes. Every component in the kit is available for purchase separately.

Does the price include customs duties for shipments outside the EU?

No. Product prices and shipping quotes do not include customs duties, import tariffs, or local handling fees that may be charged in the destination country.

Can I purchase with 0% VAT?

Yes, if you are a registered B2B customer within the European Union (outside Poland) with an active EU VAT number verified in VIES, or if you are ordering for export outside the European Union.

Is the included installation manual sufficient for a complete swap?

The manual strictly covers the mechanical mating of the engine and gearbox outside the vehicle chassis. Depending on your chassis, additional custom fabrication may be necessary (engine mounts, crossmembers, firewall modification, transmission tunnel clearance, driveshaft length). Professional installation is strongly advised.

Please note that a lightweight single-mass flywheel delivers immediate, uncompromising throttle response at the expense of eliminating OEM damping elements. This creates a much more direct drivetrain connection, which may result in a noticeable increase in transmission gear chatter and drivetrain noise. This is a normal and expected characteristic in performance and motorsport applications resulting from rigid drivetrain coupling.