sorry if this has been covered upteen times already!

My 2000 Freelander has developed a whining noise when I'm at constant speed or freewheeling. The best way I can describe it, is it sounds a bit like an underground train when it stops. Since it started happening it hasn't got any worse.
I paid for one LR garage to tell me it's practically everything in the transmission (which would cost £3300 or £5000 if I need a new prop).
Someone else told me it's the IRD.
It could well be the IRD but as that's an expensive route I'd rather be certain before I go down it.
What are the symptoms of an IRD problem?
(I am non-technical so cannot do any mechanical self-diagnosis).

The coincidence is that the noise started after I changed the back tyres?!

Any help would be appreciated...

have you fitted agressive tread on your rear tyres? are the new tyres the same rolling radius as the fronts?

same tyres all round Avon Ranger - but tread on the front is noticbly more worn (still legal) compared to the new ones.

it might be worth replacing them too

mine had a realy bad whining noise nr side front that then moved to nr side rear then fankfuly,back to her mothers ......





wafty