MODEL DS ROVERDRIVE
LAND ROVER OVERDRIVE and ACCESSORIES
FOR LAND ROVERS 90, 110 and 130
The Model DS ROVERDRIVE 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 ROVERDRIVE 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 ROVERDRIVE 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.
Engagement is done by means of a stubby extra gear lever that is fitted to the main tunnel cover boot in the cab adjacent to the range shifter knob. No alteration is made to vehicle bodywork in order to install the DS ROVERDRIVE in a 90, 110 or 130 Land Rover.
The DS ROVERDRIVE will fit Land Rover and DEFENDER models 90,110 and 130 with five-speed gearboxes. This model will not fit a Land Rover with a four-speed gear box.
There are three different versions of the DS ROVERDRIVE:
This ROVERDRIVE will fit early five speed 90 and 110 models. It has a 26 tooth output gear and will fit transfer cases suffix A and B. This model is available on special order.
This ROVERDRIVE will fit most five-speed Land Rovers. It is fitted with a 26 tooth gear common on all models of 200Tdi, 300Tdi and Td5 Land Rover with 230 transfer cases of suffix ‘C’ and later. This model is held in stock by most distributors.
This ROVERDRIVE is fitted with a 28 tooth gear. It will fit most North American specification 90 models. It will also fit Defenders that have been altered by fitting transfer cases or components from Discovery 1 vehicles. This model is available on special order.
The DS ROVERDRIVE is engineered to work with all standard Land Rover 90, 110 and Defender engines, including the 2.25, 2.5, (Petrol and Diesel) 2.5 Turbo, 200Tdi, 300Tdi, Td5 and V8.
ENHANCED PERFORMANCE ENGINES
The DS ROVERDRIVE can also be used on higher horsepower engines such as the International 2.8 and enhanced versions of the Td5 and V8 where the engine management system has been altered and/or bigger exhausts and intercoolers have been fitted. In these circumstances, our cooling transfer case cover part DX-COV must be fitted.
There is a limit to how much power can be transmitted through the DS ROVERDRIVE and 230 transfer case without experiencing overheating under high speed motorway conditions, especially in tropical climates.
As we have no control over how powerful your modified engine is, our warranty will not apply to ROVERDRIVES that have been abused by overheating.
Generally, the ROVERDRIVE can be driven hard at legal highway speeds but we recommend that if the horsepower of your engine is more than 25% above normal that you monitor the temperature of the transfer case oil and drive accordingly.
DRIVING WITH A DS ROVERDRIVE
To engage the ROVERDRIVE 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 ROVERDRIVE.
In urban driving you can engage and disengage the ROVERDRIVE in third and fourth gear to get the best working ratios. You will find for example that it is much easier to engage the ROVERDRIVE in fourth gear than to shift the main gear lever into fifth.
In off road conditions when driving in low range the ROVERDRIVE is useful for raising the ratios making it unnecessary to engage and disengage the high range lever.
Driving a Land Rover with a ROVERDRIVE 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 ROVERDRIVE negates considerable fuel savings to be had if one retains one’s original driving patterns. Our experience shows that drivers who use the ROVERDRIVE 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 ROVERDRIVE will pay for itself quickly.