There should be a wide tag (about 20-25mm wide) sitting underneath the diff fill-up plug that indicates that it is an lsd diff. There is also a small tag (approx 10mm wide) located underneath one of the rear diff housing plate bolts that has what ratio the diff is. This applies to the older diffs (like most of my cars, eg EA-ED). I think EF-BA have stickers on the axle housing (right-hand side) that indicate ratio. I think from memory (AU utes anyway) that AU's still had the lsd tags under the fill-up plug. I don't know if this is any help to you Davo, but it couldn't hurt to have a look under your car to see if there is any tags/stickers on the diff.
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