Final thing to sort TD4 auto 2002

Whurring noise at 30-40mph

Not brake related, still there in neutral, not really speed related, Just whurrs in a slow rythm that doesnt really match wheel speed. Doesnt make any difference if you load any wheel up or corner

From cold takes a couple of miles to warm up

Im worried its a bearing in the autobox or IRD

Any ideas

The rear prop mounting has a bit of a split but nothing major

Thanks

Removed upper engine cover and its stopped ????

Answers on a post card

...in the post.

do you think the cover was vibrating ?