Hello just did a LS swap I have a 04 5.3 flex fuel injectors/factory harness and pcm # 12587603 Drive by wire with a 4L80E trans and 3.23 gears and 255/35/20 tires also have another pcm # 12579405

Thank you

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I have stock 03 5.3 out of a suburban DBW / factory harness and PCM flex fuel injectors with 4L80E trans with summit cam 209 intake / 217 exhaust - 112 lobe separation cam lift 0.294 rear end has...

Hello I'm new to this just did a LS swap 5.3 with a 4L80 trans trying to fine a tune for it ?