Hi, I haven't tried any seal reconditioners but that wasn't the problem anyway; I've got new seals. There is about .4mm of sideway play in the output shaft which is not enough to for the seal to lose contact with the shaft but at full pressure oil will get past it. The only way would be to eliminate the play and for that I need a new sector shaft. These are only available from LandRover and cost an arm and two legs. In the end I chickened out and grabbed a RR four bolt box on trade me, all good now...
For the International engine, it is awsome. I installed it with a full width intercooler as I did not have one fitted before (the truck came with a TD engine) It is a perfect match for the disco gearbox too. My next step will be getting taller tyres and reverting back to the old transferbox. I have not done any calcs on the fuel consumption but where a full tank took me 450km away with the TD, I now have a range of 550 to 600km....... I the only drawback is that it's a relatively expensive engine compared to second hand options but then, for a new engine it is cheap. Still a lot of money though.
Cheers!