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Buy Replacement Auto Transmssions for BMW 4 Series

If you are facing BMW 4 Series automatic gearbox problems or it has stopped functioning completely, don't panic, BM Engine Works has the ability to fulfil all your BMW 4 Series automatic gearbox supply and fit needs at highly competitive prices. We have the largest reconditioned gearbox inventory in the UK for BMW 4 Series ready to be fitted. Our every reconditioned and second hand auto transmission is fully tested to high quality and performance standards and come with standard warranty. To find out how much would it cost you to replace the automatic gearbox at our garage, please enter your vehicle details and get unbeatable price quotes. We offer automatic gearbox fitting for minimal labour charges. Our delivery services are available all over the UK and we deliver your part at your place, wherever you want it to be delivered in the UK. Contact us now for the cheapest online prices on replacement BMW 4 Series automatic gearbox.

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It's all fixed, thank you

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Thankful for all the work that BM Engine Work has done

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Over the Moon with My Car

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Trouble free, Excellent job

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Helpful, Fast, and Amazing Service

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Brilliant Service, Great Communication

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Project Name

BMW 428i N20B20B – Reconditioned Engine Installed

BMW 428i N20B20B – Reconditioned Engine Installed Vehicle In 15-Dec-2025 Vehicle Out 19-Dec-2025

Initial Diagnosis

This BMW 428i came in with engine-related faults and was upgraded with a fully reconditioned N20B20B engine from our stock, restoring smooth performance and reliability.

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Project Name

BMW M4 3.0 S55B30A – Low Mileage Engine Upgrade

BMW M4 3.0 S55B30A – Low Mileage Engine Upgrade Vehicle In 01-Dec-2025 Vehicle Out 05-Dec-2025

Initial Diagnosis

This track ready BMW M4 required an engine upgrade instead of factory unit. We provided S55B30A engine and fitted it perfectly,ensuring stronger Performance.

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Project Name

BMW 428i N20B20 – Engine Replacement Completed

BMW 428i N20B20 – Engine Replacement Completed Vehicle In 24-Nov-2025 Vehicle Out 28-Nov-2025

Initial Diagnosis

The vehicle was fitted with a replacement N20B20 engine, restoring full performance and reliability to the BMW 428i engine after internal engine failure.

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Project Name

BMW 420D N47D20C – Full Engine Replacement & Reconditioning

BMW 420D N47D20C – Full Engine Replacement & Reconditioning Vehicle In 10-Nov-2025 Vehicle Out 14-Nov-2025

Initial Diagnosis

Vehicle arrived with critical internal engine damage. Upon inspection, our team recommended a complete BMW 420d engine replacement using a high-quality N47 D20C engine.

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Project Name

BMW M4 S55B30A – Reconditioned Engine Installation

BMW M4 S55B30A – Reconditioned Engine Installation Vehicle In 20-Oct-2025 Vehicle Out 24-Oct-2025

Initial Diagnosis

Vehicle arrived with a knocking sound from the bottom end of the engine. Crankshaft and con rod bearing damage was found, requiring a complete BMW M4 engine Replacement.

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