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Buy Replacement Gearboxes for BMW 4 Series

At BM Engine Works every BMW 4 Series manual gearbox undergoes a strict mechanical analysis and performance check to the highest level of reliability and efficiency before being sent for delivery or get fitted by our engine specialists at one of our garages. Our engine experts have years of experience and the ability to handle any car related issues and therefore guarantee that the excellence of used and reconditioned BMW 4 Series manual gearbox is persistent. Every manual gearbox is examined and inspected distinctly and assure that the products sold are in excellent working condition according to the manufacturer guideline and OEM Standards. Our large inventory of reconditioned gearboxes is ready to be sold at the cheapest prices online. We offer warranty on everything we sell and promise to offer you the most exceptional and premium of both worlds, quality and cost-effectiveness.

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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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