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

  1. #481
    Join Date
    May 2007
    Medford, OR
    I believe if you swap columns there would be no problem. It may be as easy as switching the ignition lock cylinder.

  2. #482
    Join Date
    Jan 2015
    mesa az
    It's kind of the lines I was thinking, might just be easier to have vats tuned out since I have 2 of everything...
    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

  3. #483
    Join Date
    Feb 2015
    Ok 03 3/4 ton lq4 dbw in my 03 that had a 4.3 4l60e how can i make this 4l80e harness work with my 60 tia i did search

  4. #484
    Join Date
    Aug 2014
    VATS will get you no start! The 99 4.8 PCM still thinks it's in the same vehicle but with some random voltage from the key trying to make it pass. Even with relearn a million times over done perfectly, you'll get a start then die result. Simply send pcm out to a tune shop and have VATS REMOVED. It should start right up. Make sure you have a stand alone/custom alarm though.

  5. #485
    Join Date
    Dec 2004
    San Antonio, TX Area
    Reference for me. But helpful for everyone else. Same author, same thread. Different questions.
    "ALisSa1 Silverado"
    1990 Chevrolet RCSB 2002 Chevrolet Camaro LS1/4L60E
    Scrimpin Ain't Easy
    ( . Y . )

  6. #486
    Join Date
    Apr 2015
    My silverado had only one fuel line going to motor. I think I might have to find a return line from a v8 setup

  7. #487
    Join Date
    Jul 2014
    Quote Originally Posted by Katana View Post
    My silverado had only one fuel line going to motor. I think I might have to find a return line from a v8 setup
    If your truck doesn't have a return line, all you need to do is swap your fuel rail setup to a returnless. My motor came with a return style fuel rail, all I had to do was buy some returnless fuel rails off ebay and swap them out. Youll either have 2 hard lines coming from your tank or 3. If you have 2 your truck is returnless (feed, EVAP) and you need a returnless fuel rail from a v8 truck, or youll have 3 lines coming from the tank which means you have a return style. (feed, return, Evap)
    2006 RCSB silverado 1500 4x4 - 5.3 V8 5 speed

  8. #488
    If your truck has a return setup and the motor is returnless you can also run a filter/regulator from the C5 corvettes. I used a WIX 33737 it's $40 from Summit and has an internal regulator thats set at 58#.
    2000 RCSB
    Torquer V2
    T56 Magnum
    305 drag radials
    3/4 lowering kit

  9. #489
    I just completed the swap in my 2002 swb GMC Sierra, 4.3 to 5.3, started first try after priming with no plug wires on, runs smoothly, no codes, cruise works, only problem is the torque converter isn't locking up, no overdrive... Did I miss something? I've read every post...

  10. #490
    Join Date
    Aug 2016
    Hey I have some questions I'm in the middle of a swap I got my 4.3 out an the 5.3 getting a few touch ups my truck is a 2001 Silverado 4.3 I'm going to 06 5.3 an I have the harness an throttle peddle for the 06, I have ordered all the fittings for the fuel lines in there any thing electrical I need to swap in the fuse box an, do I need to swap any thing for my cruise control ? Thanks for the input

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