4.3 to 5.3 swap problem

[03slammed]

Hey guys i have a 2003 nbs single cab and i had a shop try to do the swap because they said they can do it and they qouted me a cheap price so i went with it but anyways they managed to drop the engine in but all the wiring is a disaster! I believe the 5.3 is off a 2001 model and they switched everything from the fuse block to the instrument cluster and other things around in the cab. So would like to get it fixed if possible but i get the feeling its going to run me a fortune……… so if anybody has any suggestions would be most be most helpful, thanks

[MajesticLT03]

you need to find a 5.3 from an 03-07.. the 99-02 5.3 electrical and wiring is entirely different.. all the electrical plugs are different (including interior)

[03slammed]

Thanks, already have the truck almost ready to go just looking for a cheap wiring harness around town

[sj250]

Here's a great thread about these swaps for you!

http://www.performancetrucks.net/forums/gm-engine-exhaust-performance-21/official-nbs-v6-geniii-v8-swap-guide-378643/