Ok Chaps, I have just put the gearbox back in my series 1, i had it out to put new bearings in. when i drove it all was well for about a mile then there was a loud screeching noise, its speed dependent and will carry on if i coast out of gear. it comes on randomly and if i stop it will go away then start again once upto speed. if i run through the gears with the transfer box out of gear theres no noise. it sounds a bit like a metal shield on a bearing rubbing, but there are no shielded bearings. Any idea where to look first?