prep for 5.3/4l60 to 6.0/4l80 swap

[jmj85]

I've got a 01 tahoe 5.3/4l60/4x4 and I picked up a 6.0/4l80/TC out of a 04 2500HD. the 6.0/4/80/tc are all still mated together, and wirig hardness harness and ECM are still connected. From what Ive been reading here, it should be a direct swap (plug and play).

Is there any wiring differences between the to years. Didn't things change 03/04 time frame?

I noticed the connector for the Park Nuetral Saftey Switch is disconnected and it appears that two of the wires were pulled out/ broke away from the connector on the harness. SO THE fix; are the harnesses from the 4L80 and 4L60 the same?

I use my Hoe for a DD and mainly Slowing a 5500-6000lb boat. My looking at long tube headers, true dual exhaust, haven't decided on an air intake yet, a program, and a CAM (but I don't know what one?)

thanks in advance.
Jason