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I want to put my 4.8l, 2004 motor into my 2009 both Chevy Silverado,....need input!!!
 

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Your 2004 is a gen 3 engine with a 24x crank trigger. It won't work on your 2009 pcm because it is a 58x gen 4 platform.
 

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You could get a translator to convert the signal, but you will also still have wiring modifications because some sensors are in different locations, and the translator will cost way too much to make it worth it.

Unless you have some special 4.8, or you cannot get a newer one then it is a poor investment.
 
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