i'm confused about this 5.3 swap

[468Blazer]

ok heres the deal I have a bad transmission in my 96 gmc 2wd 5.0/auto truck. I have found a 5.3/auto 2wd out of a 03 chevy pickup that I could purchase cheaper than rebuilding my trans for.
So my question if I recieved the engine/tranny complete wiring, accessories etc, wouldn't all I need is the mounts for the lsx type engine and swap this in? Or would I have to get wiring dedicated just for the engine/tranny for the swap?
Any input would be appreciated. I'm not looking for anything performance just a factory to newer factory swap.

[farmtruc]

You'll need a dedicated wiring harness for the engine and trans, a PCM, tuning, exhaust mods, mounts, and misc parts that add up to be quite a bit.

[jtaliaferro]

2003 5.3 will be DBW so you will need all the equipment for DBW.. (peddle, tac ect...) or convert to DBC...

[468Blazer]

the engine/tranny will have all wiring and pcm so I'm assuming I could use it without going aftermarker right?
I'm used to swapping carb engines sorry for the newbie questions.
thanks again for the responses

[NITROUS]

Yes the stock harness will work but you'll have to graft the old vortec harness into it and add a couple of things. Allen has a real nice harness and it's stealth. I'm thinking about pulling mine out and sending it to him so he can build me a few plug and play vortec harnesses.

[468Blazer]

thanks