Please note the lead time on this product can be up to 3 months
After having successfully marketed the TD5 Defender Auto kit and the natural follow on was the TDCi model when this was introduced in 2007. This was not a simple task and involved considerable development work but we have now sucessfully being converting the 6 speed manual to a 4 speed auto for some time, on both the 2.4 and 2.2 models.
When it was announced the Defender engine was being changed from the TD5 to the 2.4 TDCi we had several enquiries to ask if an auto kit would be available and we started working on it straight away. We bought a Transit 2.4 engine with manual gearbox to allow us to develop a prototype. In the past when we have made up a conversion kit it has been possible to utilise parts from related vehicles in the existing model range, eg some Defender parts, some Disco parts Etc. The 2007 Defender was a much more complex job involving much more design and manufacture than previous kits. Firstly there was no autobox that was a straight fitment to the new 2.4 engine (unlike the TD5) so we needed to make a bellhousing and flexplate assembly from scratch, also the transfer case has been rotated a further 10 deg from the previous position so new mounts were required. There were many small things like this, where with the TD5 kit you would just use a Disco part on the 2.4 it was a case of working out what you need then prototype, test, draw, sample, manufacture Etc.
As always with our conversions we try to keep as near to Factory spec/look as possible this involved keeping the engine and transfer case in “Factory position” so any conversion to automatic box must fit as a direct replacement for the manual box to avoid any propshaft or transfer case changes. The transfer case still functions as normal i.e, with the diff lock and high and low ratios.
We decided to use the well proven ZF 4HP22EH autobox which was used in the P38 Ranger Rovers and the Series 2 Discovery’s as we have considerable experience with these units and they are readily available. To fit the auto box to the 2.4 engine we manufactured our own bell housing, paying attention to length and orientation of the auto box allowing a “drop in” fit. It was also necessary to design and make a crank boss and flexplate assembly.
In order to give optimal performance of the auto-box we have developed a “stand alone” control unit called the Compushift . The controller takes signals from the throttle position sensor on the throttle pedal, the speed sensor in the autobox and the gear position switch on the side of the autobox, this information is fed to the ECU and the correct gear selected according to the preset “maps”.
This “electronic” control is a major step forward over the previous “hydraulic” auto-box conversion we had used in the earlier TD5. With this control unit we have a fully adjustable controller allowing us to “customise” or “map” the gear shift to suit each application. It is possible to map the individual shift points and shift pressure v.s throttle position also the torque converter lock up speed and a whole host of other variables.
Great video here of an Australian customer installation :
The Defender Auto Plaque is not included the kit but is a nice addition. If you would like this please select from the dropdown menu.
The price shown is for the kit only however we are able to offer a fitting service for £5,870 plus vat and this price assumes we keep the manual gearbox. We would require the vehicle is with us for 7-10 working days. Please contact us directly to arrange a fitting appointment.