Official NBS 4.3v6 to GEN 3 V8 swap Guide

[CHEVROLADE]

Looks like ill be doing this swap soon

One thing can I use a 03' harness on a 01' 02' dbc engine ? Or does it have to be same year

I just don't want to mess with DBW and pedal

[zebra]

not positive, but i don't think you can. i know the computer pinouts/plugs were different (blue/red on older; blue/green on new), and ain't the instrument cluster interfaced a different way? i only put an 01 engine in a 99, so i just used an 01 harness, so i ain't the expert here

[Hoss]

Iv'e read all this but i still have a few questions.have an 05 with the 4.3 took it out put in a 01 5.3 even used the stock v6 mounts .were have problems with the harness for trans we had to swap that plug to the old v6 harness does any one have a read out for that plug its what holding us back from the swap being completed.or do we have to use a differen't harness trying no to have to use the dbw we have the dbc on it now?

[blacstar]

Iv'e read all this but i still have a few questions.have an 05 with the 4.3 took it out put in a 01 5.3 even used the stock v6 mounts .were have problems with the harness for trans we had to swap that plug to the old v6 harness does any one have a read out for that plug its what holding us back from the swap being completed.or do we have to use a differen't harness trying no to have to use the dbw we have the dbc on it now?

you need to get a 2004-up harness. the pinouts are different. if ur truck were to come with a V8, it would have been dbw.

[Wrkd_LSX]

you need to get a 2004-up harness. the pinouts are different. if ur truck were to come with a V8, it would have been dbw.

so is it possible to move the pins to make the 99-02 dbc harness to fit a 03 4.3 dbc fuse block?

[blacstar]

Looks like ill be doing this swap soon

One thing can I use a 03' harness on a 01' 02' dbc engine ? Or does it have to be same year

I just don't want to mess with DBW and pedal

pinouts are different, its easy to search for a tac module, gas pedal, and harness

[BIG BLOCK 555]

i have sierra 2001 v6 4x2 AT ( 4l60e ) i want to swap to an LS1

this is my first GM car ( Japan user ) i live in saudi arabia i asked everbody about this swap no one have a clue about it

so here is My questions :

1- i did find an engine without harness & PCM
2- i find an engine harness from a 2001 sierra v8
3- also find an engine mount & frame mount
4- i find a flex plate & torque converter from a v8

q1 - do i have to change any interior harness ?
q2 - do i have to send my pcm over to allen or any tuner will help ?
q3- i have been told that the gearbox housing is not the same as a v8 ?
q4- do i have to change fuse box or just leave it as it is ?


i have been searching all over i didn't write this until i am 100% sure that i didn't find any answer to my questions

thanks to OP for his work and effort & everybody have been helping

[blacstar]

i have sierra 2001 v6 4x2 AT ( 4l60e ) i want to swap to an LS1

this is my first GM car ( Japan user ) i live in saudi arabia i asked everbody about this swap no one have a clue about it

so here is My questions :

1- i did find an engine without harness & PCM
2- i find an engine harness from a 2001 sierra v8
3- also find an engine mount & frame mount
4- i find a flex plate & torque converter from a v8
looks like you have everything
q1 - do i have to change any interior harness ? nope
q2 - do i have to send my pcm over to allen or any tuner will help ? send it to allen
q3- i have been told that the gearbox housing is not the same as a v8 ? transmission is the same
q4- do i have to change fuse box or just leave it as it is ? leave it


i have been searching all over i didn't write this until i am 100% sure that i didn't find any answer to my questions

thanks to OP for his work and effort & everybody have been helping

start wrenching

[BIG BLOCK 555]

thanks a lot blacstar

i will do the swap by my self .. is it ok to go with v8 PCM ?

[zebra]

it's newer than 99, so it already has the V8 PCM - so long as it's the silver one.