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[Alex]

Have a slight constant rumble noise from the rear end which seems to increase in volume and pitch on the overrun.  Local garage checked wheel & half-shaft bearings and said they were OK.  They suggested that I change the rear tyres which while legal were pretty worn.  New tyres fitted, but no difference.  Could it be the diff, and if so are there any oil additives I could use - obviously reluctant to shell out for a new unit. Also have a broken rear nearside spring so getting both sides replaced tomorrow, but I don't think that would be responsible for the noise.

[tonyyeb]

Had exactly this problem on mine not long ago, Alex.

Initially the garage couldn't find fault with either rear wheel bearing, but that's precisely what it turned out to be - O/S/R wheel bearing.

Perhaps wait until the noise becomes more conclusive??

[RobG]

Check diff oil level. Filler plug on offside near the top. Oil should be level with filler hole