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I have an extended warranty on mine. I would only buy a Ford ESP plan, no 3rd party warranties for me. The bad news is, I don't think you can buy one for your truck because it is past the 36k mile bumper to bumper. Or maybe you can, but have to pay a premium price. You'll need to check with a Ford dealer to be sure, but brace yourself for bad news.
If they say no, put whatever money it would have cost in a certificate of deposit and earn interest for the inevitable.