PMC Motorsport adapter plate / conversion kit / clutch kit Mercedes-Benz M113 / M112 – 6-speed manual BMW N54 ZF GS6-53BZ 135i 335i 535i – 240 mm / 9.45"

Important: Installation of the PMC flywheel requires the automatic version flywheel (starter ring gear / flexplate) Mercedes-Benz M113 / M112 OE A 273 030 03 12 (a2730300312) (not included).

Adapter plate enabling the mating (swap / conversion) of the Mercedes-Benz M113 petrol engine (V8 4.3 / 5.0, M113 AMG 5.4, M113K 5.4 Kompressor) or M112 (V6 2.4–3.7) with the ZF GS6-53BZ 6-speed manual gearbox used in BMW petrol N54 applications (E8x 135i, E9x 335i, E60 / E61 535i, Z4 35i). The ultra-durable GS6-53BZ gearbox (1000 Nm+) is the perfect foundation for high-power builds. An ideal solution for amateur and professional motorsport, drifting, and daily-driven street cars.

Planning an engine swap with a Mercedes-Benz M113 / M112 into your BMW (E30, E36, E46, E34, E39, E90, E91, E92, E60, E61, E81, E82, E87)? Our adapter is a reliable solution. Replace the automatic gearbox with a manual transmission from BMW and unlock new possibilities.

PMC Motorsport adapters not only enable an automatic-to-manual transmission conversion in cars with a Mercedes-Benz M113 / M112 engine, but also provide support for completing an M113 / M112 swap into BMW and other chassis, such as Nissan (S13, S14, S15, PS13) or Mazda RX-7 / RX-8.

Aluminum gearbox adapter plate engineered to simplify transmission installation as much as possible, avoiding radical procedures such as cutting off the entire gearbox bellhousing – only preparing an opening for the starter motor is required. Custom flywheels dedicated to PMC Motorsport adapters are made of aluminum with a replaceable friction surface, inspected and balanced prior to shipping. Flywheel designed for a 240 mm pressure plate (GS5-39DZ / GS6-53DZ / BZ BMW OE). Adapter thickness: 20 mm (0.78").

PMC Motorsport gearbox adapters are a synonym for precision and top quality. The design process based on 3D scanning and inspection using a measuring arm ensure a perfect fit. Production on modern CNC machines guarantees ideal concentricity and alignment between engine and transmission, which is crucial for powertrain longevity.

Additional Information

Installation Instructions

Installation of the flywheel requires the automatic transmission flywheel (starter ring gear / flexplate) from a Mercedes-Benz M113 / M112 OE A 273 030 03 12 (a2730300312) (not included). Bolt the flywheel to the crankshaft using the supplied bolts. Mount the clutch release fork on the lower pivot position of the throwout bearing (in case of a two-position release bearing). Use a 240 mm clutch friction disc with a 32.5x35-26N spline dedicated to the GS6-53BZ gearbox. To install the adapter plate, use the original Mercedes-Benz M113 / M112 starter motor (OE, not included). The release bearing, clutch fork, and clutch slave cylinder are not included in the kit – they are retained from your gearbox.

Frequently Asked Questions

Which engines is this adapter compatible with?

With Mercedes-Benz M113 petrol engines (V8 4.3 and 5.0), M113 AMG (V8 5.4), and M113K (V8 5.4 Kompressor), as well as M112 (V6 2.4, 2.6, 2.8, 3.2, and 3.7) – including models from Mercedes W202, W203, W210, W211, W220, C208, C209, C215, R129, R230, W163, and W463.

Which gearboxes does the adapter fit?

The 6-speed manual ZF GS6-53BZ gearbox from BMW powered by the N54 petrol engine in versions HGX (THGX), JGD (TJGD), JGF (TJGF) – E60 535i, E9x 335i – and JGK (TJGK) – E8x 135i, Z4 35i. The gearbox features a 32.5x35-26N spline.

Which starter ring gear must be used with the PMC flywheel?

The automatic transmission flywheel (starter ring gear / flexplate) from Mercedes-Benz M113 / M112 OE A 273 030 03 12 (a2730300312). The ring gear is not included in the kit.

Does the gearbox bellhousing need to be cut?

No. The adapter is engineered to eliminate the need for cutting the bellhousing – only an opening for the starter motor needs to be prepared.

What additional parts do I need to purchase for installation?

A 240 mm clutch pressure plate and friction disc (32.5x35-26N), release bearing, clutch fork, and clutch slave cylinder dedicated to the GS6-53BZ gearbox, the automatic transmission flywheel (starter ring gear / flexplate) Mercedes-Benz OE A 273 030 03 12 (a2730300312), and the original Mercedes-Benz M113 / M112 starter motor. These parts are not included in the kit.

Which clutch pressure plate fits the PMC flywheel?

A 240 mm (9.45") BMW OE type pressure plate – from BMW M57N / M57N2 / N54 / B58 / E46 M3, Sachs XTend 3000 951 952 (M57N / M57N2), Sachs XTend 3000 951 949 (N54 / N55), or Sachs Performance 883082.001243. Aftermarket clutches such as ACT / Spec / Tanaci are also commonly used – the custom pressure plate must fit the BMW OE flywheel pattern (M57N / M57N2 / N54 / B58). For the GS6-53BZ gearbox, use a 240 mm clutch disc with a 32.5x35-26N spline, along with the dedicated release mechanism and clutch slave cylinder.

Which position on the release bearing should the clutch fork be mounted to?

On the lower position of the release bearing (for two-position bearings) – as shown in the "Installation Instructions" diagrams.

Which starter motor should be used?

The original Mercedes-Benz M113 / M112 starter motor (OE). The starter motor is not included in the kit.

Can I use the adapter with another BMW gearbox, e.g., GS6-53DZ?

Yes. The PMC Motorsport gearbox adapter plate itself is universal and fits most BMW gearboxes (applies to adapters manufactured after 2022). When switching transmissions, you only need to change the flywheel and clutch disc.

Does the adapter also fit the ZF 8HP automatic transmission?

Yes. The PMC Motorsport gearbox adapter plate itself is universal and fits most BMW gearboxes (applies to adapters manufactured after 2022). For a ZF 8HP automatic conversion, replace the manual flywheel with the PMC Motorsport 8HP torque converter adapter.

What is included in the kit?

Aluminum gearbox adapter plate (20 mm) with mounting bolts, custom PMC Motorsport flywheel with replaceable friction surface, crankshaft bolts, pressure plate mounting bolts, and a pivot pin – replacement for BMW OE 21 51 1 223 328. The clutch, release bearing, clutch fork, and slave cylinder are not included in the kit – they should be selected according to your gearbox.

Can I purchase only the adapter or only the flywheel?

Yes. Every component of the kit is available separately.

Does the price include customs duties for shipping outside the European Union?

No. The product price and shipping quote do not include customs duties or additional import taxes that may apply in the recipient's country.

Can I purchase with 0% VAT?

Yes, if you are a B2B customer outside Poland with an active EU VAT number (validated in the VIES system), or if your order is being exported outside the EU.

Are the included instructions sufficient for installation?

The instructions outline mating the engine to the transmission outside the vehicle body. Depending on the chassis, custom modifications may be required: engine/gearbox mounts, bushings, firewall modifications, transmission tunnel clearance, driveshaft length. Professional installation is strongly recommended.

Please note that a lightweight single-mass flywheel provides uncompromising throttle response at the expense of factory damping elements. This results in a more direct drivetrain engagement, which naturally may increase audible gearbox chatter/gear rollover noise. This is an intended and normal characteristic in motorsport vehicles resulting from the rigid mechanical connection between the engine and drivetrain.