Had my front lower arms done recently, alongside the 7yr/105k mile service the other day and since then I've noticed a whirring noise from what I would consider to be either the front transfer box or maybe a front drive shaft? The noise changes tone with road speed not engine or gear. Opinions as to which it might be or something else?

On the other hand, it might be as a result of changing the lower arms/service and introducing a tone I hadn't noticed before. However, it sounds like an 80s Army Land Rover as heard from the roadside as it comes along about 40mph - that whirring noise.

I've just taken the RRS to the south of France and its most noticeable when slowing down and coming off d/carriageways! But the roads over there are generally super smooth. Tyres are Grabbers, so might be them as well.

What does anyone think it might be?

Road speed dependent would suggest it wheel related - Does it vary on cornering - possible wheel bearing.

Could be front pinion shaft bearing but that would usually vary with power on or power off. could be diff. carrier bearings

Is it there from cold? - just wondering if its something daft like the viscous fan and/or drive belts.

It seems to be always there but most noticeable (road speed noise vs noise) around 50mph. Doesn't seem to vary with direction of wheels but then only minor change in direction at speed. Can't hear it at very low speed.

+1 for bearings?

My fronts were replaced (both) at around 70k RRS gone
Audi SQ5...Gone Audi Q7 S-Line 240 3.0TDI Gone
Audi A6 Allroad Sport 270 3.0TDI

Think I have the same issue...more like a squeel though rather than a whirring noise. It's not the breaks because they have a different pitched squeel when breaking at slow speeds.

Seems to ever so slightly change pitch if turning and more niticable at low speeds, however the engine noise may be masking it at higher speed.

Does this sound similar or could it be something else? 57 Reg TDV8 - Java Black - Privacy Glass - Side Steps

You say you have Grabbers fitted - are they the Grabber AT? If so, I've found that they are quite noisy at some speeds particularly around 30mph and 55-70mph. It's a droning noise that doesn't change much over the speed range and is the same whether on throttle or the overrun. 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

i would say the grabbers are causing it ,i had a sport with them on once and i thought the diff was was just the tyres  silverRRS 2.7 TDV6 22"WHEELS FULL COLOUR CODE,STEPS,REMAP..gone
Rimini red rrs 2.7 tdv6 steps. Full c code. Recon engine!!loved but!gone ,thank god !!
Gone rr sport supercharged. Loved but 11mpg !!!
current,triumph stag mk2...current bmw 325 sport convertible