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

  1. #471
    Join Date
    May 2009
    Location
    hot & windy
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    1,124
    i typically get about 14 all in-town & about 16-17 if it's 75% highway @ 60-65mph. that's with 33s on 16s, 3.73s, LTs, ORY, airaid intake. that's on a mid-grade tune (maybe .5mpg less than the 91 tune i had before). also consider i'm at 3500-4000' & we regularly have crazy wind (30kt+). in TX running 93, i'd see around 18mpg hwy @ 75. in FL with my 31s, i'd seen as high as 20.

    if anything, i'd get the A:F doped out first before making any other decisions... not that a cam wouldn't help anyway
    my tach reads right - it didn't the very first time, but that was because i did the math & figured out Jesse programmed 4.10s instead.
    no cruise in my truck.

    maybe some other guys could chime in with their results
    Last edited by zebra; 08-03-2014 at 05:58 PM.
    00 FRC - just top end, exhaust, and a hot-air intake
    99 Sierra - 5.3 / 5spd
    ↓ click the pic for the build ↓

  2. #472
    Join Date
    Jul 2014
    Posts
    21
    hmmm, wonder why mine is so low then. Ill have to get my tuning checked for sure. Im in texas so 93 is everywhere, but with the prices of gas these days i went the cheap route to save a few bucks at the pump and did the 87 oct. tune. Not sure what the deal is with the rpm gauge then if yours reads right, maybe they messed up with my gears as well. Ill shoot erica an email about it tomorrow. Thanks for the replies, and yeah if anyone knows the fix for the cruise id like to hear it, i pulled some wiring diagrams up and printed them out, im sure i can do some work with the wiring and get it to work, just didnt know if there was an eaiser fix. Didnt realize how nice it was until it didnt work anymore lol.

    If i move some wiring around and get it to work ill post it up here for others that may be seeing the same problem.
    Last edited by Selbyvince; 08-03-2014 at 06:52 PM.
    2006 RCSB silverado 1500 4x4 - 5.3 V8 5 speed

  3. #473
    Join Date
    Dec 2014
    Location
    GA
    Posts
    3
    Ok maybe I missed it, but maybe someone can help.

    I have an 03 silverado 1500 2wd 4.3 v6 with a cable throttle.
    What motor options do I have?

    Use any 6.0 and swap in an 02 and earlier harness and computer? and use a cable throttlebody?

    Can the stock v6 automatic tranny be built up to handle the 6.0 or would it be better to swap the 6.0 and auto together?

  4. #474
    Join Date
    Jul 2014
    Posts
    21
    Quote Originally Posted by BrockGrimes View Post
    Ok maybe I missed it, but maybe someone can help.

    I have an 03 silverado 1500 2wd 4.3 v6 with a cable throttle.
    What motor options do I have?

    Use any 6.0 and swap in an 02 and earlier harness and computer? and use a cable throttlebody?

    Can the stock v6 automatic tranny be built up to handle the 6.0 or would it be better to swap the 6.0 and auto together?
    You can use any 03-07 motor (4.8,5.3,6.0). You will have to convert over to dbw. (Very simple) You will use the wiring harness for the motor you buy, and you can get with a tuner and have them flash your computer to work with the motor.
    IMO, the trans should be fine to start off with unless your doing something crazy with the motor.
    2006 RCSB silverado 1500 4x4 - 5.3 V8 5 speed

  5. #475
    Join Date
    Dec 2014
    Location
    GA
    Posts
    3
    So complete turn key 03-07 engine, and harness, and flash my v6 comp with my vin for the new engine.
    What about the DBW and gas pedal? pull that from the doner as well, if possible?

    Also read the 03 is a PITA, why was it an odd year/transition?
    Last edited by BrockGrimes; 12-09-2014 at 10:46 AM.

  6. #476
    Join Date
    Jul 2014
    Posts
    21
    Quote Originally Posted by BrockGrimes View Post
    So complete turn key 03-07 engine, and harness, and flash my v6 comp with my vin for the new engine.
    What about the DBW and gas pedal? pull that from the doner as well, if possible?
    Yes, they will have to alter your vin in the tune so that the computer knows it's a v8. But for the most part yes. Yeah you'll need the tac module which is mounted where your cruise control module is on your truck (if you have cruise). The wire going to the pedal, and the pedal itself. Nothing to changing all that out. Fun part is going to be finding the correct frame mounts. I went through 3 different sets before I found the ones that made my motor line up. And even then they were mix matched.
    2006 RCSB silverado 1500 4x4 - 5.3 V8 5 speed

  7. #477
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    yeah, about the mounts - remember each side has 2 pieces (what bolts to the engine & what bolts to the frame). the plates that bolt to the frame are specific to light duty frames (1500) and heavy duty frames (2500 & 3500) as well as also being different for 2wd or 4wd.
    00 FRC - just top end, exhaust, and a hot-air intake
    99 Sierra - 5.3 / 5spd
    ↓ click the pic for the build ↓

  8. #478
    Join Date
    Jul 2014
    Posts
    21
    I got my cruise working, oddly enough, I had my vin changed in the tune and it started working. Weird, but ill take it lol.
    2006 RCSB silverado 1500 4x4 - 5.3 V8 5 speed

  9. #479
    Join Date
    May 2009
    Location
    hot & windy
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    yeah, my tune's VIN matches the tahoe i pulled the engine from
    00 FRC - just top end, exhaust, and a hot-air intake
    99 Sierra - 5.3 / 5spd
    ↓ click the pic for the build ↓

  10. #480
    Join Date
    Jan 2015
    Location
    mesa az
    Posts
    5
    Ok quick question, I have a 2001 v6 5 speed and a late 99 nbs 4.8 5speed
    Can I simply remove everything including pcm from the 99 and drive it without tuning? Or is vats gonna get me with a no start?
    2001 long travel RCSB 4.3 nv3500- 5.3 swap enroute
    2001 7.3 excursion 4x4-daily
    2013 Sentra- wife
    2014 raptor power wheels(legit badass little truck)- son
    2008 HD 96" of thunder
    2006 KTM 250 SXF with Athena stroker kit
    1994 4runner- budget chase-blazeland long travel basher

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