2008 sierra 4.3 to 5.3

[Kerlton]

Has anyone swapped a 4.3 out of a 07-09 sierra/chevy for a 5.3? I’ve got everything to do this swap but I’m still uneasy about having it done. I have the pcm hoses engine and harness for the engine. The tranny from the 4.3 will work i believe. Any tips or advice? Thanks

Why on the first place do you need that? Better to buy 5.3 of the same year and make some modifications to it (IMHO).