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Humming Noise When Driving Over 100kph

PAV34
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PAV34 Mentor

PAV34

Posted
Posted

Basically, when im on the freeway doing 100kph, there is a humming noise when the car is in gear, when i change to neutral and role the humming goes away. I dont know if its coming from the gearbox or the diff, but its a quiet hum every second or so.....hum.....hum......hum......hum.

Any ideas? Im leaning towards it being a diff problem...

I have ruled out the problem being tyres or anything under the bonnet.

Liquidity Explorer

Liquidity

Posted
Posted (edited)

How long has it been since you got a wheel alignment?

cheap and quick way to rule out wheel balance, hub issues, etc , and most decent aligners will spot any damage suspension issues while they are at it.

Most likely your diff but its somewhat expensive to swap that out.

Edited by Liquidity
GTS4WD Grand Master

GTS4WD

Posted
Posted

From what I have been reading and heard from people drive shaft re-balancing is rarely the cause.

I too have a driveline noice over 100k but I was told from another GTS4 owner who had the same problem it was the transfer box.

Does anyone know how to how to assess whether the transfer box can be making this noise?

blind_elk Grand Master

blind_elk

Posted
Posted

A couple of things happen when you toss it into neutral @ 100kph:

Revs drop to idle (assuming your foot comes off the pedal at the same time!)

Load is removed from gearbox

Load is removed from diff

and in a GT-R / GTS4, load is removed from the transfer case and front diff.

So, it's possible it could be in the exhaust, but that is usually a "drone" (low pitch). If it were in the gearbox, the frequency would vary depending on engine revs (which gear) @ 100kph (hum....hum....hum.... vs hum..hum..hum..). If it were tyres, then the noise wouldn't go away in neutral.

Check fluid levels in the front diff, rear diff and gearbox. Maybe even change them. See what happens.

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