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well im pretty sure that the 6.0 comes with the 4L-80E...now the 4L-60E which is what the 5.3 has can only handle like 300 to 350 hp going through it (thats what i have heard from everyone)...so i think that you would have to do a complete replace of motor and tranny and all the wiring...i think....well someone who knows chime in....
 
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