Rear end rattle/vibration/grinding noise

Good evening
My landrover 90 has developed a noise at speeds of about 55mph+ .Coasting or on overrun it sounds like the noise is is comming from the rear end ive removed the pannel from the seat box above the transfer box and taken it for a run. It doesnt sound like its from the transfer box/ gearbox area. The wheel bearings feel ok with no play or rumble when jacked up.
The noise is almost the sort of noise that an exhaust would make against the chassis(but it isnt).
So i think it could be rear prop or diff.
Has any one experienced anything like this before???
Can i remove rear prop and take for a run to rule out rear propshaft ??
Any advice would me much appreciated
The landy has a 2" lift
Many thanks Sam

try it without rear prop noise on over run is often pinion bearings in the diff

jamesmartin said:

try it without rear prop noise on over run is often pinion bearings in the diff

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Thanks for your quick reply much appreciated do i need to put transfer box in difflock

yes