LSD whinning

[jondee86]

Kind of an interesting topic Most gear noise is due to the teeth
"slapping" together as they come into mesh. So this noise will follow
the speed of the vehicle... become higher in pitch the faster you go.

Gear mesh noise is greatly influenced by the setup of the gears.
Traditionally, these are designed to have an eliptical contact patch
centred halfway up the tooth, and biased towards the toe of the tooth
during setup. Under load, the contact patch will enlarge and move
towards the centre of the tooth width.

A contact patch that is not centred will result in high tooth pressures,
edge contact, vibration and noise !! It is also very important to use
a high quality oil specifically formulated for differential use.

And it is also worth remembering that the harder your suspension
bushings are, the more noise they will transmit into the car interior.
The same metal box you painstakingly stripped of all sound insulating
materials to save weight :-D

Cheers... jondee86