Noisy trutrac differential

[Robert Dawson]

Hi, this is my first post. I have recently bought a 2009 VE SS. It has had a truetrac differential with 4:11 gears fitted in 2016. It is noisy especially at about 80kmh. Can anyone give me some advice as to what I can do. I am new to Commodores.
Cheers,
Robert

 

[mechanic]

What type of noise?
How do you know it’s the diff?
Tyre or bearing noise can sound very similar.

 

[lmoengnr]

Hi, this is my first post. I have recently bought a 2009 VE SS. It has had a truetrac differential with 4:11 gears fitted in 2016. It is noisy especially at about 80kmh. Can anyone give me some advice as to what I can do. I am new to Commodores.
Cheers,
Robert

The (aftermarket) 4.11 ratio gear sets for the ZF diffs are known to be noisy.

 

[Robert Dawson]

What type of noise?
How do you know it’s the diff?
Tyre or bearing noise can sound very similar.

It was diagnosed by my mechanic who knows modified commodores well. You can hear the noise all the time but louder at 80kmh. I did think of tyre noise at first.
Thanks

 

[Robert Dawson]

I heard someone suggest promar additive.
Would different grade diff oil make any difference?

 

[mechanic]

What type of noise?
Gear noise is usually a whine that comes only at certain speeds.
Bearing noise is there constantly.
The two are treated differently.

 

[lmoengnr]

What type of noise?
Gear noise is usually a whine that comes only at certain speeds.
Bearing noise is there constantly.
The two are treated differently.

The 4.11 gearsets available for ZF diffs are inherently noisy...

 

[Immortality]

If your mechanic is familiar with modified Commodores, what was his suggestion?

If it is the gears than generally there isn't much you can do except maybe try a different oil.

 

[07GTS]

did u keep the factory diff rubbers or upgrade to more solid ? even with my standard diff 3.7 i changed mine to street semisolid and got a heap of noise so went back to factory and silent again

 

[vr304]

If they used the motive brand diff gears they are noisy, got the diff rebuilt in my old vx ss with a true Trac and 3.9 gears new bearings etc and it was noisy right from the start due to the diff gears