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I am considering keeping my eyes out for a used PCM for my truck. The one I have is tuned (live tuned?) and there is no way for me to turn it off. I am having tranny issues (intermittently drops to third for no reason at highway speeds) and I think an extra one in stock would be a good idea.
Am I off base with my thoughts? What years will fit my truck? What should I beware of when scoping one out to buy?