Weird low humming noise ONLY at 60-65 km/h

Got a defender 90 2011 with 60k miles, already checked wheel bearings, the car was neglected for a while so i assume the sound started long time ago. Changed all diff and transfer box oils.

Just want to know if someone had this kind of problem of a low humming noise only at that speed, the noise doesnt change pitch, its a constant frequency at 60 kmh, before or after that speed the sound is totally gone.

Could it be tyre related? They can make all sorts of strange noises especially if they are old and worn/going out of shape

Def90man said:

Could it be tyre related? They can make all sorts of strange noises especially if they are old and worn/going out of shape

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Tyres are in good shape, is a good diagnostic jacking the car up and accelerating to 60kmh to see if it isnt the tyres?

Plaioz said:

Tyres are in good shape, is a good diagnostic jacking the car up and accelerating to 60kmh to see if it isnt the tyres?

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If the tyres aren’t in contact with the ground they aren’t going to make the noise and it would be entertaining if it came off the jacks at 60

Def90man said:

If the tyres aren’t in contact with the ground they aren’t going to make the noise and it would be entertaining if it came off the jacks at 60

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But the video will be fun to watch

My tyres are noisy around 65mph

Def90man said:

If the tyres aren’t in contact with the ground they aren’t going to make the noise and it would be entertaining if it came off the jacks at 60

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I only have chunky firewood an the factory tool to jack de car up, will try it this weekend.

Its strange, the noise is only between 60-65 km/h. Could it be the gearbox?

It could be many things. The prop shafts could be singing at a certain speed too

Is it still there when you dip the clutch.. would rule out tyres if it ceased humming?

moremuckmush said:

Is it still there when you dip the clutch.. would rule out tyres if it ceased humming?

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Tried dipping the clutch, mixed results, the sound is bit louder when accelerating than decelerating
Will try this method again

l have a similar noise at exactly 65mph, it's my rear differential and has done it for at least 50,000 miles.
Doesn't do it below 63mph and above 67mph

I have a similar sound at a certain speed and I ID'd it to the roof rack. At a certain wind speed it resonates like a badly tuned cello.

Booked for an alignment and tyre balance. Might start from the basics

Cv joint?

lightning said:

l have a similar noise at exactly 65mph, it's my rear differential and has done it for at least 50,000 miles.
Doesn't do it below 63mph and above 67mph

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Have you opened the diff to check any damage from the noise?