U have already opened a thread with the box overheating light issue why start another one.
My auto box fluid is replaced every 20k miles but LR in the book say 24k Miles.
 
It depends on usage. If it's just on-road work that's one thing, if it's heavy, frequent off-roading that's entirely another.
 
the temp sender used to make tricks quite often, or bad contact in the plug cos it's exposed to corrosion and dirt, you can see it through the front grille it's in the bottom of the oil cooler(RH side)
 

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