There should be a metal tag on the back of the diff, held on by one of the bolts that hold on the cover. If it is a lsd, the tag should read S4.10 (assuming its a 4.10 ratio). If theres no s, its open. Or if you have the car in the air, when in neutral, spin on rear tire. If the other goes in the same direction its an lsd. Opposite or no movement from the other side means open.
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