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Reconditioned & Used BMW 4 Series Automatic Transfer Box in Stock Now

BM Engine Works offers very cost effective solutions to get out of BMW 4 Series transfer box problems. We offer highest quality reconditioned and used automatic transfer boxes for your BMW 4 Series. Each and every automatic transfer box we source is tested for its performance and quality up to the manufacturer guidelines and OEM standards. We offer supply and fitting services as well, if you need your purchased part to be delivered at your place anywhere in the UK.
If drivers experience a whining or grinding noise, there is something unusual about to happen that can turn to a very hefty crash. It's also possible that the driver may feel shaking and set off the ABS brakes & lights. It means that your BMW 4 Series needs an urgent diagnosis for this issue or it might lead to a hefty damage.

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On Point Service, 10 Out of 10
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Daily Updates and Fixed Price
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Reliable Service, Quick Service, Quick Turnaround
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Brilliant. No Crazy Surprises
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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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BMW Restoration Stories

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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