300tdi gearbox noise

hello all

My Disco is not well, its making a whining noise from the gearbox area in 3rd 4th and 5th, 1st and 2nd seem to be ok, this is only when power is on and not when costing. Ive changed the gearbox oil (fully synthetic), the transfer and diff oils (EP90), regreased the UJ's and changed the rubber doughnut on the rear prop. Which has not helped at all. Any idea's?

any knocking at full lock?

just gone to have a look and yes!

Thats what mine did before the transfer box/centre diff went BANG!!! and left me in the middle of Crack and Ho St,bristol.

Come on lads,give up the info!