After changing the gearbox, transfer box and fitting a new rear prop shaft I'm getting a loud bearingy type whine at motorway speeds that seems to be coming from the centre of the car.

The gearbox is perfect when shifting and seems to be perfectly quiet when at lower speeds in all gears and the rear prop shaft is brand new with a new centre bearing on it so am reluctant to think that could be the cause so I'm guessing the transfer box has a bad bearing in it.

I'm getting fed up taking this car apart now and don't fancy the idea of stripping and rebuilding the transfer box as that'll no doubt end up in my dismantling it for a 4th time...

So... does anybody have a KNOWN GOOD transfer box that'd fit?

Thanks,
David. 2002 4.6 Vogue SE - Alveston Red with Lightstone Leather
2007 Range Rover Supercharged in Java Black with Ivory Leather
2012 Range Rover 5.0 SC Autobiography in Indus Silver with Jet/Ivory Interior
2012 Range Rover 4.4 TDV8 Autobiography in Baltic Blue with Sand Interior