I had a new transfer box from the main dealer last week. Fitted to car yesterday ,car runs fine for 2-3 miles and then over heats transfer box and gearbox. Plenty of oil in gearbox and of course new transfer box. When examined, red gearbox oil on gearbox seems to have been blown out because of the overheating . Left car for an hour then runs fine for 2-3 miles again. Please can anyone help? Dave.