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Will a 5.7 bolt up in place of a 7.4 in a 98 GMC 3500 with the 4L80 tranny basically I want to replace my 7.4 with a 5.7 cause the 7.4 is so Damm expense to replace where the 5.7 is more readily available do I only need to replace the computer
 

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Yes. The fuel pressure regulator with the 5.7 should work just fine.
 
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