Roamerdrive DS Defender Overdrive

(9 customer reviews)

£1,775.00 £1,735.00 Excl. VAT

The Roamerdrive unit is supplied as a comprehensive kit including all parts required to fit, including linkages and gear selectors.

Roamerdrive Kits include printed fitting instructions

CUSTOMER NOTICE: Due to delays with our supply chain on Roamerdrive units processing for dispatch may take slightly longer in some cases.  We expect all orders to be dispatched within 7-10 days (but we will always aim for earlier where possible).

Thank you for your patience at this time.



The Model DS ROAMERDRIVE is an upgraded version of our model DX first introduced in 2006. The upgrades on the DS model include a more open front-end architecture that enables oil shared with the transfer case to be circulated more efficiently. An Archimedes screw on the main shaft retains oil behind a ‘dam’ in the front cover to ensure efficient lubrication at high speeds and on steep inclines. A crush washer on the nose of the overdrive provides bearing preload on all variations of transfer case.

Other than the use of epicyclical gear technology, the DS has little in common with other designs of overdrive sold for five speed Land Rovers in the past. The overdrive has no electrical components or cone friction clutches and no dedicated oil sump. It is a very compact unit that shares oil with the transfer case and does not interfere with exhaust pipes or other fittings on the Land Rover.


The DS overdrive can be fitted to any five-speed 90, 110 or 130 model Defender Land Rover from the time of introduction in 1985 up to and including the TD5 model.   Apart from the specific exceptions listed below, the DS-B overdrive will fit all models of 90, 110, and 130 DEFENDER type Land Rover with the following motors:



2.5 Diesel

2.5 Diesel Military

2.5 Turbo

200 Tdi

300 Tdi


The DS model can also be fitted to vehicles with popular replacement engines such as the International 2.8 and TD5 engines that have been modified to produce more power.  Some restrictions apply to such modified vehicles   see installation instructions ».

The overdrive takes about three hours to install and is supplied as a complete kit that includes everything required to make the installation apart from lubricating oil.

The overdrive is engaged using a simple hand lever.  The lever is conveniently located on the centre console immediately adjacent to the Hi/Low range knob.

The DS-B will not fit in the following cases:

  1. Models fitted with four speed gearboxes.
  2. Models fitted with 230 transfer case suffix A and B found on early 90 and 110 models. You would need to fit the later suffix transfer case used up to the TD5 model.
  3. Models that have been retrofitted with Discovery transfer cases.
  4. Models that have been retrofitted with six speed gearboxes. You would need to fit the suffix transfer case used up to the TD5 model.

See DS Installation Instructions for more information ».


To engage the overdrive when on the highway, wait unit you are travelling at about 50 mph (80 kph) in fifth gear. Depress the clutch and move the actuating lever forward exactly as you would when changing gear.  When the clutch is released the engine RPM will drop by 28% and the noise level in the cab of the Land Rover will drop significantly. As changing traffic and gradient dictate, you can engage and disengage the unit.

In urban driving you can engage and disengage in third and fourth gear to get the best working ratios.  You will find for example that it is much easier to engage the ROAMERDRIVE in fourth gear than to shift the main gear lever into fifth.

In off road conditions when driving in low range the overdrive is useful for raising the ratios making it unnecessary to engage and disengage the high range lever.

Driving a Land Rover with a Global Roamer overdrive is a pleasant experience as it is possible to have a normal conversation at relatively high motoring speeds

The inclination to drive faster with the overdrive negates considerable fuel savings to be had if one retains one’s original driving patterns. Our experience shows that drivers who use the ROAMERDRIVE at moderate speeds will save up to 15% on their fuel costs. The long-term saving of less wear and tear on engine and drive line components are also considerable. Bear this in mind and your overdrive will pay for itself quickly.


Below are the Warranty terms direct from the manufacturer (  No warranty is given by Syncro Gearboxes:

“Unless otherwise stated elsewhere, ROAMERDRIVE overdrives are warranted against defects in materials and workmanship for a period of one (1) year from date of purchase.

This warranty is made to the original purchaser only and covers ROAMERDRIVE overdrives that have been installed on the same vehicle since purchase. We (or our appointed distributor) will repair or replace any overdrive unit that suffers from manufacturing defects within the warranty period.

In order to take advantage of this warranty the unit must be returned, at your expense, to the distributor. If you purchase the overdrive directly from our factory in West Vancouver, the unit must be returned to our factory at your expense.

PRIOR TO RETURNING a unit under warranty, you must first contact your distributor, or our factory in West Vancouver, to discuss your issue. Once we have all the necessary information, we will issue a Warranty Return Approval document. We will NOT accept any unit that is returned under warranty if it has not first been issued a Warranty Return Approval document.

Your Warranty Return Approval document will have detailed instructions on the shipping documentation that must be sent with the overdrive unit being returned under warranty. Not following the warranty return shipping instructions may result in unnecessary additional government charges being levied, which will be your responsibility.

Once warranty work is done, our distributor or the factory will return the unit to you freight prepaid.

Transfer case gear noise is not covered under this warranty.   If your transfer case gears are worn, then your noise problem can be rectified by replacing these gears, not by replacing the overdrive.  It should be noted that initial cases of minor gear noise tend to be self-correcting as the new and old gears in the gear train bed in together over the first 10,000 km.

Under no circumstances will we cover the cost of removing or replacing the overdrive on a vehicle, or be responsible for any other expenses whatsoever.

Our warranty does not cover damage caused by lack of lubrication, use of improper oil, or damage caused by overheating the ROAMERDRIVE in applications with non-standard engines and gear boxes.”

Additional information

Weight 20.01 kg

9 reviews for Roamerdrive DS Defender Overdrive

  1. Paul (verified owner)

    Fitted this to give me the extra cruising ability on long camping trips without the need to compromise on a taller transfer gearbox. So far has been great, straightforward fit etc, arrived super fast from synchro

  2. Gijben Hornes (verified owner)

    Quick as always, good feedback, well priced.
    Very happy with the products and services from Synchro

  3. Anonymous (verified owner)

    Excellent service as always!

  4. Paul Doyle) (verified owner)

    Great piece of kit. Arrived speedily. Ordered the larger sump and it arrived even faster. Good courier company for deliveries to Ireland

  5. Donald Whittaker (verified owner)

    I very much appreciated the fact that Kim kept giving me directions over the ‘phone when my Sat-Nav let me down .

  6. Miles Toulson-Clarke (verified owner)

    Very happy with the service

  7. Anonymous (verified owner)

    Great product. Should have installed it earlier. Cruising is so much bearable now

  8. Paul C. (verified owner)

    Rapid delivery, great product, thank you!

  9. Martin (verified owner)

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