Hey mate as said they wear out, What we have found on a couple of trucks is you need to get the speed up in the diff to get any action, Try wacking it in a higher gear and giving it some herbs if you are stuck in this situation and it should send some power to the grounded wheel.
Disclaimer: I am 90% sure this is a good way to fuck all sorts of components in your truck, The alternative is get the LSD reconditioned and it will work all the time.
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