Auto Gearbox Conversions

TD5 & TDCI 2.2/ 2.4

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 used 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”.

Please see below our most recent Auto Gearbox conversion on our stunning 2014 White Defender 90.

Please contact us for pricing.