I have a 98 Land Rover discovery NAS that I would like to convert. I 'am looking at the 4BT or Isuzu. 4bts came mated to GM400 transmissions in some bread trucks and there is an adapter from marks 4wd that will mate up a GM trans to the land rover transfer chase. I have found the adapter from Isuzu swapper that will bolt the Isuzu to a GM trans then I could use the marks 4wd to mate it up to the land rover drive line. Is there a way to bolt the Isuzu to the ZF trans that came in the Rover? I would like to keep it simple as possible. I saw the Defender with the 4BT but have not seen any other Rover pictures with the 4BT in them. I would like to go with the 4BT if possible but I would like to here if anyone has stuff ether engine in a Range Rover or Discovery chassis.