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Thread: Official NBS 4.3v6 to GEN 3 V8 swap Guide

  1. #391
    Join Date
    Dec 2012
    Posts
    3
    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?

  2. #392
    Join Date
    Dec 2012
    Posts
    12
    I have a 1995 silverado 4.3 5speed manual I want to put and automatic and a v8 I was wanting to do a newer 6.0 I found one that's complete with trans What would u recommend That is the easiest v8 swap to do Thanks

  3. #393
    Join Date
    Jan 2012
    Location
    DFW, TEXAS
    Posts
    596
    Quote Originally Posted by Hoss View Post
    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.

  4. #394
    Join Date
    Jan 2012
    Location
    DFW, TEXAS
    Posts
    596
    Quote Originally Posted by Nickadamsaaa View Post
    I have a 1995 silverado 4.3 5speed manual I want to put and automatic and a v8 I was wanting to do a newer 6.0 I found one that's complete with trans What would u recommend That is the easiest v8 swap to do Thanks
    yes it is easy, just like a 4.8 or 5.3 swap would be. all the 'ls' family engines are pretty much the same

  5. #395
    Join Date
    Jan 2012
    Location
    DFW, TEXAS
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    596
    Quote Originally Posted by CHEVROLADE View Post
    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

  6. #396
    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
    Last edited by BIG BLOCK 555; 01-07-2013 at 05:02 PM. Reason: forgot something

  7. #397
    Join Date
    Jan 2012
    Location
    DFW, TEXAS
    Posts
    596
    Quote Originally Posted by BIG BLOCK 555 View Post
    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

  8. #398
    thanks a lot blacstar

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

  9. #399
    Join Date
    May 2009
    Location
    hot & windy
    Posts
    1,124
    it's newer than 99, so it already has the V8 PCM - so long as it's the silver one.
    00 FRC - just top end, exhaust, and a hot-air intake
    99 Sierra - 5.3 / 5spd
    ↓ click the pic for the build ↓

  10. #400
    i faced some problems during my swap any help will be good

    1- the frame mount don't fit under oil pan but my stock one fit great .
    2- there's some holes under water pump what are they for ?

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