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I sent an Ebay seller a message asking about their PCMs, and they claim that my 1997 C3500 7.4 does not require a crankshaft relearn procedure after swapping PCMs. They say that only started in 1998, is this true?
Cool, thanks guys. I was trying to figure out how to get a tune on my 97 without having any downtime. I was going to get a cheap eBay PCM while I sent my original out. But... I went ahead and put in an order with Black Bear, since I won't need a relearn on my new PCM.