It is very hard to tell from a video, but that doesn’t seem to be anything speed related rotational or airflow through the engine which should change in pitch with revs / speed. It doesn’t seem to be changing with speed or revs. Passenger footwell... what have you got in the glove box? Any cutlery?

Back to serious mode, it reminds me of a dry clutch release bearing on a manual gearbox the way it comes in, is constant and then goes again, but yours is auto and I am no auto gearbox expert, perhaps someone else can pick up on this notion.

I wonder if this is coinciding with the torque converter stator freewheel window which I think starts at 40mph ish? At that speed, the stator which normally turns in the opposite direction to the fluid flow from the pump is expected to get splash back and freewheels on its own clutch - a bit like a release bearing freewheel operation when the clutch pedal is up on a manual. Or maybe the lockup clutch if the LR box is of that type. The lockup clutch kind of gives certain torque converters multiplication factors for efficiency, locking two halves of the torque converter together. If the stator comes in at 40 with a noise and say the lockup clutch kicks in later and stops it... wild guessing time admittedly.

I can’t think of anything else which would change at a moment in time and keep consistent, apart from cutlery in the glove box

I realise that I haven’t described this too well, so maybe this link will help you understand what I am rambling on about and someone who really knows about auto boxes/TCs (like someone from Bell engineering) can offer a bit more on why this is absolute nonsense.

https://auto.howstuffworks.com/auto-parts/...verter.htm

jules wrote:

It must be my hearing but I cant hear anything sounding high pitched & metallic. There is a low rumble sound at times - is that it?

How many miles ?

At 11 years old it could be all sorts of things Im afraid. But Id start by checking over rubber mount for engine/gearbox and exhaust.

SeeFive wrote:

It is very hard to tell from a video, but that doesn’t seem to be anything speed related rotational or airflow through the engine which should change in pitch with revs / speed. It doesn’t seem to be changing with speed or revs. Passenger footwell... what have you got in the glove box? Any cutlery?

Back to serious mode, it reminds me of a dry clutch release bearing on a manual gearbox the way it comes in, is constant and then goes again, but yours is auto and I am no auto gearbox expert, perhaps someone else can pick up on this notion.

I wonder if this is coinciding with the torque converter stator freewheel window which I think starts at 40mph ish? At that speed, the stator which normally turns in the opposite direction to the fluid flow from the pump is expected to get splash back and freewheels on its own clutch - a bit like a release bearing freewheel operation when the clutch pedal is up on a manual. Or maybe the lockup clutch if the LR box is of that type. The lockup clutch kind of gives certain torque converters multiplication factors for efficiency, locking two halves of the torque converter together. If the stator comes in at 40 with a noise and say the lockup clutch kicks in later and stops it... wild guessing time admittedly.

I can’t think of anything else which would change at a moment in time and keep consistent, apart from cutlery in the glove box

I realise that I haven’t described this too well, so maybe this link will help you understand what I am rambling on about and someone who really knows about auto boxes/TCs (like someone from Bell engineering) can offer a bit more on why this is absolute nonsense.

https://auto.howstuffworks.com/auto-parts/...verter.htm