We have converted NAS spec Discovery 1 Land Rover's up to 1998 to 300Tdi diesels removing the V8 4Ltr motor. If the vehicle is a standard this allows us to use a kit made by a UK supplier to mate the 300tdi to the power train. However if the Disco was an Auto as was ours the conversion is more indepth as I do not like the weaker V8 auto box and torque converter, the inner govenor in the box and kick downs also have to be converted. After much expermimentation and the rebuild of the our Diesel auto box we can honestly say from experience that if you are planning on towing or doing a lot of off roading that the money is well spent in the upgrade of the Auto box using our suppliers heavy duty gears and larger torque converter, add this to an uprated intercooler and increase the fueling at the pump it makes the 300tdi come to life in a Disco.