Official NBS 4.3v6 to GEN 3 V8 swap Guide

[Wtfan18]

Hmm.... this is a good question and im interested in finding out the answer.

Surely just not plugging in the TB sensor will work. I would say just get the 99-02 harness but it won't work with the 03+pcm. You can't run a 99-02 pcm because the rest of the truck is 03+. I wonder if the Dr. X harness would come into play here at all?!

Hopefully there is a way around it but idk for sure. If not, looks like ya might have to buy the pedal and TAC module. Junkyard would be the best place for that route

Post this question over on performancetrucks, im sure there will be alot of curious people over there as well

hmm i may just do that, i didnt even thing of the different PCM issue, im thinking getting the pedal assemby and TAC module sounds easier so long as there isnt anything else besides those 2 components to make the drive by wire work as it should.

I would think you need to get an 04 harness assembly with dbw so the the BCM and PCM can talk to each other. IDK

hey Greg, i have the harness from my 04 6.0 which should work on the 05 5.3 as the 05 5.3 harness worked with my 04 6.0 when swapped.

this question has been asked many different times throughout the 35 pages of this thread but there hasnt been 1 real definite answer to any of them, ill do my best to figure it out! thanks all!

[Wtfan18]

okay so to answer my own question someone over on PT.net posted this response in the same thread, evidently by getting the pedal, tac module, and harness he was all set.

"does ur 5.3 have drive by cable or drive by wire throttle body...in my cases the 4.3 has a db cable setup.....my 6.0l has a db wire setup....so i had to go out and get a dbw pedal and module along with the harness for the two of them!

not bad though i found a guy who has em for 55 plus shipping...let me know if u need one!"

[f4tal]

There ya go. Glad you found it. Sucks you have to buy the pedal and module but at least it'll be done right. Goodluck!

[Juice]

Im in the process of doing a lq4 swap into my 05. The 4.3 is now a boat anchor.

[zebra]

good luck. plenty of info around here

[t.austinjacobs@gmail.com]

Hey man I've blown up my 4.3 and was searching around to see if I could swap in a 5.3 for a feasible price. If I have a complete engine with a matching year/make PCM could I just plug and play, or would I still have to have my V6 PCM reflashed? How much did your reflash cost? And could I use the stock gas lines up to the engine bay and then put a threaded end on the stock lines and re route to make them work? Every thing else I need (hoses, etc) I would just get at junk yard like you recommended. Let me know. Call or text (912) 614-7921 or email me @ t.austinjacobs@gmail.com.
Thanks man!

[zebra]

Hey man I've blown up my 4.3 and was searching around to see if I could swap in a 5.3 for a feasible price. If I have a complete engine with a matching year/make PCM could I just plug and play, or would I still have to have my V6 PCM reflashed? How much did your reflash cost? And could I use the stock gas lines up to the engine bay and then put a threaded end on the stock lines and re route to make them work? Every thing else I need (hoses, etc) I would just get at junk yard like you recommended. Let me know. Call or text (912) 614-7921 or email me @ t.austinjacobs@gmail.com.
Thanks man!

no offense, but almost every question you asked is answered in this thread or threads referenced by this one. you only have to get a new PCM if you have a 99 truck or are swapping to/from the 00-02 style or 03-07 style. every tuner charges differently. lines gotta get cut (click my sig to see pics) may as well get new hoses.

it's all here

[Nitz45]

Where would i be able to find a complete engine like the one pictured above

[Frenchy]

A junkyard.

[zebra]

or in somebody else's truck... but you're liable to get shot trying to take that one