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For the guys who’ve done it I’m curious. I currently have a 2000 GMC Sierra Sierra 1500 with the 4.8. I’m looking to switch to a 5.3 or a 6.0. I know if I keep the stock computer I will need to have it tuned. However if I get an engine with a computer. Do I still need a custom tune or do you literally switch the computers and it works like it should. I tried searching for my answer but I didn’t find an answer to my specific question. Thanks in advance for any help.
 

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You could use a new computer but would have to get around VATS. Either with a relearn procedure that is a nightmare using the key on and off sequence, or reprogramming it, basically tuning it. I'd just get a custom tune and waken it up a bit while your at it
 
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