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Thread: swapping to a 4.3

  1. #1
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    swapping to a 4.3

    im getting a 4.3 tbi out of a junkyard next weekend...and its replacing my 2.8...my question is...do i need just the wiring harness from under the hood or do i need the harness from under the dash also
    Last edited by DBLAZE; 05-10-2009 at 02:06 PM.

  2. #2
    Registered User hdridinas2's Avatar
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    I have a 2.8 and I swapped the orginal computer with a 4.3 compter. Only thing that was messed up was my shift light stayed on while in 5th gear and it ran rich. I only did this to see if the wire harness was the same. I would say disconnect your 2.8 pull it out, slap in the 4.3 and hook the 4.3 computer up to the original 2.8 wiring.

  3. #3
    Registered User hdridinas2's Avatar
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    Quick question. Like I said I have a 2.8, 5 speed tranny and the blazer is an 86. Was wondering what tranny you are using. Will a 2.8 manual tranny bolt up to a 4.3 that you know of? What else have you found needs to be done for the swap?

  4. #4
    Registered User dragnblazer's Avatar
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    never done the swap. m blazer came with a 4.3 and a 700r4 transmisson. i dont know if you you can you use the 5 speed but i dont see why not.
    My project thread 89 bagged 2door
    http://www.blazinlow.com/forum/showthread.php?t=68023

    Wife's daily
    2002 chevy blazer 4 door 2wd ls

    My daily
    2000 Gmc jimmy 2 door 5 speed

  5. #5
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    im using a th350 transmission...the 2.8 transmission will not work on the 4.3 because the 2.8 is a 60 degree engine and the 4.3 is a 90 dergree engine....therefore it will not bolt up

  6. #6
    Registered User Skully's Avatar
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    Laurens,S.C.
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    DBLAZE is correct just get a th350

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