My Defender 110 rear diff whines on decelleration. I drained and refilled the oil, which contained some bronze deposits (like panning for gold!). It works fine, is there an additive to quieten it a bit that anyone's used sucessfully?
The hine is likly to be the bearing being tired. Do you have a Salisbury or a rover type rear axle? If it is rover type then the diffs are fairly easy to change over and not to difficult or expensive to get your hands on.
I believe they can also be rebuilt, not something I have done as I have a salisbury. I am also not sure what the differences are with the late model rear diffs what other models may be compatible. I'm sure a gown up will be along shortly to inform you.