differential noise HJ61

Hi there,

I recently purchased a grey import HJ61 and had the oil in the rear diff changed (valvoline LSD oil was put in). After that, I went for a long outback trip-on return, I noticed some oil on the rear axle. It turned out that the rear diff breather leaked. I had it checked by ARB and all, including the oil level, were OK.

HOwever, I started noticing a funny noise coming from the back of the truck, it sounds like the tyre noise, but it is present even when stopping with clutch disengaged. It is not too loud, but I am not sure should there be any noise from the differential at all. A funny thing is that any bumps on the road can be heard as "bumps" in that noise. This made me innitially think it must be the tyres, but am not sure any more because the tyres would probably not make the noise at very low speeds (just before stopping), and no noise comes from the front (unless the engine noise masks it out). Would it be posible that this occurs because of change to cold weather and the oil still didn't get warm?

I am not certain whether to change the dif oil again, of course the mechanic will say definbitely yes. What kind of a noise is acceptable, if any? I removed the rear seats, which would make this noise more audible inside the truck

I read in another post that the rear and front diffs can be exchanged - does this apply to the trucks with LSD at the rear? I would have thought an LSD would be a bit different than a standard diff...but I know little about the bits and pieces in the diffs.

Thanks,

Joseph