Nup, silicone spray is different to WD40. Should be able to find it at Bunnings etc, i think that 'Australia Export' company (the one that makes all the cheap spraypaint) make it, but not sure. Youd definately be able to get some either ther or Repco though.
Diff whine - ive heard of some AU's having it but not many. Perhaps a trip to a diff specialist will help you work out what is causing the noise (if it is the diff).
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RAM 1500
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