where is the rear differential oil pan located?
#3
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there should be a plug to drain (look at the bottom of the diff) and a separate plug to check the fluid level higher up near the drive shaft. IIRC the capacity is 1.5L.
#4
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If you're going to change the diff fluid, always make sure you can remove the fill plug before you take out the drain plug - ancient Land Rover proverb.