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

  1. #271
    Join Date
    Apr 2009
    Posts
    115
    A little surface rust wouldn't be too bad, so long as it hasn't progressed to serious pitting. The issue is the distance. We couldn't be much farther apart.

  2. #272
    Join Date
    May 2009
    Location
    hot & windy
    Posts
    1,117
    well they're actually back home in middle TN, if that's closer
    00 FRC - just top end, exhaust, and a hot-air intake
    99 Sierra - 5.3 / 5spd
    ↓ click the pic for the build ↓

  3. #273
    Join Date
    Feb 2010
    Location
    North County San Diego
    Posts
    61
    Well my wife picked up the 5.3L that was pulled out of a 01 tahoe. I pulled it out of the back of my truck today and I was a a bit bummed. I paid $800 for the engine to include wiring harness and PCM. Well when I got the engine out of the back of my truck, I found that they cut all the wires going aft of the engine that would have gone to the transmission and firewall etc... Whats the point.... I'm going to give the guys a call on Monday and my guess is that they will take of the connections and hand it to me to splice. the other item is 2 broken ignition modules, one on each side. It's obvious they broke them when they installed the chain to left the engine out. WTF... I'm not happy with how this is starting out. Here are some pictures of us getting the engine out of the back of the truck......
    Attached Images

  4. #274

    Arrow

    I have a few questions. Im in the middle of the swap right now, after putting everything toghter we went too install the torque converter bolts, the motor was locked. We figured out the torque converter was hitting the flywheel. We removed the tranny and motor spins fine.

    I used the 4l60E that was bolted too my 4.3 motor, i also used that converter. What flywheel am i suppouse too use? The 4.3 flywheel bolts are off center on the 5.3 motor. Any help would be apprciated.


    Also the DBW is their a write up on that anywhere, i searched. Problem there is the truck was cable before, but the swap i bought is DBW, i looked under the dash how doo you remove the old pedal? can i just cut it out and bolt the DBW one up?

  5. #275
    Join Date
    May 2009
    Location
    hot & windy
    Posts
    1,117
    use the 5.3 flexplate & make sure it's on the right way. i don't think they'll go on backwards, but there's no harm in checking
    00 FRC - just top end, exhaust, and a hot-air intake
    99 Sierra - 5.3 / 5spd
    ↓ click the pic for the build ↓

  6. #276
    Quote Originally Posted by zebra View Post
    use the 5.3 flexplate & make sure it's on the right way. i don't think they'll go on backwards, but there's no harm in checking
    Do they have diffrent style 5.3 flex plates? The one that was on the motor looks a litte flat compared too the 4.3 one. Also where the Converter goes into the motor, the hole isnt as deep as the 4.3 motor does that matter?

  7. #277
    Join Date
    May 2009
    Location
    hot & windy
    Posts
    1,117
    yeah. don't compare it to the 4.3 stuff - they're gonna be different. as far as i know, the ls truck engines used the same flexplate from year to year (specific to the transmission, obviously). you'd get some clearer info from somebody who's worked with automatics - which is pretty much everybody else here
    00 FRC - just top end, exhaust, and a hot-air intake
    99 Sierra - 5.3 / 5spd
    ↓ click the pic for the build ↓

  8. #278
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    You cannot use the old converter on the Gen3 flexplate without a convertor extension or custom convertor. You may have to slot the holes in the flexplate to line up with the convertor. Hughes makes an extension for the convertor center pin
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  9. #279
    Quote Originally Posted by RedHeartbeat View Post
    You cannot use the old converter on the Gen3 flexplate without a convertor extension or custom convertor. You may have to slot the holes in the flexplate to line up with the convertor. Hughes makes an extension for the convertor center pin
    Is their an older flexplate or Converter I can buy too work? I really don't want too use extensions or anything.

  10. #280
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    Contact CircleD, site sponsor on the front page, and tell them what you're doing and they can build you a convertor.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

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