Crank relearn required on pre-98 trucks?

[crunky944]

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?

 

[df2x4]

My red '97 has never needed one, and I've swapped PCMs several times.

 

[Supercharged111]

96-97 is a different PCM than 98+.

 

[crunky944]

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.