I have been away for a while. Last few ones I have done have been converting good disco boxes to defender spec using worn out / water damaged defender boxes as spares donors. To do this swap everyone will tell you the box needs to be stripped down totally to swap FTC4588 involving hunreds of pounds of labour. It can however be done in about 30 mins from start to finish. Drain the box, remove the bellhousing (six bolts), and top shifter mechanism. Remove the bolts holding the alloy rear housing