A Customer's Gearbox Has Failed: How to Offer an Exchange Gearbox at Your Garage and Identify the Right Reference?

A customer pulls into your garage with a gearbox that won't select gears cleanly, jumps out of ratio, or has simply given up after several hundred thousand kilometres: the question of replacement arises immediately. Given the prohibitive cost of a brand-new OEM part, an exchange reconditioned gearbox is often the only economically viable solution you can offer without losing the customer. The key is knowing how to identify the correct reference, understanding the process, and choosing a supplier whose standards match your professional reputation.

At EDEN BOITES, French specialists in reconditioned gearboxes and engines, we work daily with independent garages, multi-brand dealerships and bodyshop repairers who have made the exchange gearbox a genuine commercial asset. This guide gives you everything you need to structure that offering, identify parts with precision, and avoid compatibility errors that cost time and money.

Why does the exchange gearbox represent a real opportunity for your garage?

An exchange gearbox is not a second-best solution: it is a technically and economically sound response perfectly suited to your customers' needs. A gearbox reconditioned by a specialist such as EDEN BOITES goes through a rigorous process of full strip-down, dimensional inspection, replacement of wear parts, reassembly and functional testing. The result is a unit restored to a performance level equivalent to new, sold at a significantly lower price than an OEM gearbox, and backed by a parts warranty of up to 24 months.

For your garage, the benefits are numerous:

• Customer retention: you offer a credible, documented alternative without directing customers towards a competitor or an unaffordable new part.
• Predictable margin: the cost of the part is known upfront, fitting time is the same as for a new gearbox, and you can charge properly for your labour without being undercut by a manufacturer's quote.
• Responsiveness: with a specialist partner, lead times are confirmed at the quoting stage, allowing you to schedule the job and manage customer expectations with confidence.
• A point of difference: few garages build a structured exchange gearbox offering. It is a strong market position at a time when quality repair work often lacks visibility.

How to identify the correct gearbox reference: mistakes to avoid

This is where most errors occur. A gearbox is never universal: even with the same bodyshell and what appears to be the same engine, there can be significant differences depending on the year of manufacture, the exact engine output, the market variant, or even the assembly plant. Here are the details you should always collect before requesting a part.

The engine code: the most reliable data point

The engine code (or engine type code) is stamped directly onto the engine block. It is short and alphanumeric (3 to 4 characters depending on the manufacturer), and it precisely identifies the engine family, the engine capacity and often the power output. It is the most reliable element to cross-reference against a reconditioned gearbox catalogue. On a Volkswagen, a Peugeot or a Renault, two vehicles of the same model and year can carry different engine codes — and therefore incompatible gearboxes in terms of final drive ratio, number of ratios, or mechatronic interface.

The VIN: the vehicle's universal identifier

The VIN (Vehicle Identification Number), also known as the chassis serial number, consists of 17 characters. It appears on the registration document, on the windscreen on the driver's side, and often on a door sill plate. The VIN allows the vehicle's exact history to be reconstructed, including its destination market, original specification, and the gearbox fitted at the factory. For EDEN BOITES, the VIN is a particularly useful cross-checking tool for modern diesel engines, DSG or automated manual gearboxes, and hybrid powertrains.

The gearbox number: directly on the unit

The gearbox itself carries a number stamped or engraved on its casing. This manufacturer's number identifies the gear ratios, compatibility with the differential, and sometimes the associated software version for automatic or DSG gearboxes. If the gearbox is still accessible before removal, note this number: it is often more precise than the data on the registration document.

Year of manufacture and mid-cycle revisions

A vehicle model can undergo a facelift or technical update during its production run without any change to its commercial name. On certain ranges, a gearbox fitted to a 2014 model year vehicle is incompatible with the same model in 2016, even though the official technical specification appears identical. This is notably the case on several 6-speed diesel gearboxes from the PSA and VAG groups, where changes to synchromesh rings or input shafts were introduced without any visible alteration to the external reference. Always specify the month and year of first registration, not just the model year.

DSG and automated manual gearboxes: specifics to communicate clearly to your customer

If the diagnosis points to a DSG (dual-clutch) or automated manual gearbox, several points should be explained before the order is placed. A reconditioned DSG gearbox is supplied without the mechatronic unit but with a new dual clutch. An automated manual gearbox is supplied without the actuator. These components — the mechatronic unit and the actuator — are subject to a separate diagnosis and are not included in the supplied part. Make sure your customer is aware of this before fitting, to avoid any confusion about what is and is not included.

How does the exchange process work in practice for a professional garage?

The exchange principle rests on a commitment from the garage: the customer's faulty gearbox (known as the "exchange core") must be returned after the reconditioned unit has been fitted. This return is mandatory and governs the terms of the transaction. The used unit is then reconditioned to replenish stock for the next exchange. This virtuous cycle keeps prices competitive whilst maintaining a quality standard well above that of a salvage part.

In practice, the process for a garage is as follows:

1. Diagnosis confirmed: the gearbox has failed and cannot be repaired locally.
2. Data collection: engine code, VIN, gearbox number, month and year of first registration.
3. Request a quote online or via live chat from EDEN BOITES, providing all references.
4. Confirmation of availability and delivery lead times.
5. Fit the reconditioned gearbox.
6. Return the old gearbox (exchange core) in accordance with the agreed terms.

Payment can be spread over up to 10 instalments, which can help with cash flow management for some of your customers.

Which symptoms should point towards a gearbox exchange rather than a local repair?

Not every gearbox problem requires a full exchange. However, certain symptoms clearly indicate that internal wear is too advanced for a one-off repair:

• Stiff or impossible gear changes when cold or hot, which do not improve after an oil change
• Grinding or clunking noises under load, particularly when the engine is revving up
• Jumping out of gear on the overrun or under load
• Vibrations transmitted to the bodyshell during gear changes, often mistakenly attributed to a transmission problem
• Significant oil leaks at the shaft seals or casing, with contamination of the internal bearings
• On automatic and DSG gearboxes: harsh gear changes, judder in automatic mode, unexpected neutral selections, gearbox warning lights illuminated

In all these cases, an oil change and a thorough diagnosis are essential before any order is placed. But if wear is confirmed on the synchromesh rings, shafts or internal bearings, an exchange gearbox is the most reliable and cost-effective solution for your customer.

Browse our full range of reconditioned gearboxes in our gearbox collection and identify the right reference for your customer's vehicle.

FAQ – Exchange gearboxes for professional garages

What is the difference between an exchange gearbox and having a unit rebuilt?

With an exchange gearbox, you receive a unit that has already been reconditioned and you return the old one (exchange core required). With a rebuild of your own unit, you send your customer's gearbox to EDEN BOITES, who reconditions it and returns it to you. No exchange core is involved in the second case: the unit returned is the customer's own. Both options have their advantages depending on the situation and stock availability.

What information do I need to provide to get an accurate quote?

The minimum required is the engine code (stamped on the block), the vehicle's VIN, and the month and year of first registration. If you have access to the gearbox before removal, the number stamped on the casing is a valuable addition. This data allows EDEN BOITES to identify the exact reference and eliminate any risk of incompatibility caused by mid-cycle manufacturer updates.

What does the warranty on a reconditioned EDEN BOITES gearbox cover?

Every reconditioned gearbox from EDEN BOITES is covered by a parts warranty of up to 24 months. This warranty applies exclusively to the supplied part. It is a strong selling point that you can highlight in your repair quote to reassure customers about the durability of the solution.

How long should I allow between ordering and receiving the part?

Lead times depend on stock availability and the reference in question. You will be given precise lead times when the quote is issued. Plan the customer's vehicle downtime accordingly and place the order as soon as the diagnosis is confirmed, to avoid any unnecessary wait for your customer.

How do I manage the return of the exchange core with my customer?

It is important to inform the customer at the quoting stage that the old gearbox must be returned without fail. Keep the unit as removed (no further dismantling, no abrasive cleaning), pack it carefully in the packaging supplied with the delivery, and follow the return instructions provided by EDEN BOITES. A damaged or incomplete exchange core may affect the terms of the return.

Are DSG and automatic gearboxes available on an exchange basis?

Yes, EDEN BOITES also covers DSG dual-clutch and automatic gearboxes on an exchange basis. Important reminder: a DSG gearbox is supplied without the mechatronic unit but with a new dual clutch. An automated manual gearbox is supplied without the actuator. If the mechatronic unit or actuator is also faulty, it is subject to a separate diagnosis and treatment. Make sure to clarify this with your customer before ordering.

Is it possible to spread payment for larger jobs?

Yes, payment can be made in instalments, in up to 10 instalments. This option can be useful for jobs where the overall cost is significant, particularly on newer vehicles or dual-clutch gearboxes. Ask about the applicable terms when requesting your quote.

How does EDEN BOITES support garages in building their expertise in exchange gearboxes?

EDEN BOITES is a technical point of contact available to help you identify references, cross-reference engine codes against manufacturer parts lists, and guide your diagnosis. The aim is to enable you to offer your customer a reliable service with no risk of error. Our team handles enquiries from trade customers via the online quote form or by direct contact, to the exacting standards expected by specialist garages.