40 pin ecm on a 70 pin engine

Discussion in 'Trucks [ Eighteen Wheelers ]' started by flat top, Jan 20, 2013.

  1. flat top

    flat top Bobtail Member

    44
    25
    Jan 28, 2010
    Colby Ks
    0
    Yeah, I sure wish they wouldn't have bothered.

    It does have a 550 low nox file in it, negating any potential gains from the swap.
     
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  3. Ashman_42

    Ashman_42 Light Load Member

    248
    64
    Aug 14, 2011
    0
    A 70 pin wiring harness isnt too expensive, I just put a new one on engine for 380$ can. because it was rubbing through and throwing engine speed sensor codes.
     
  4. ROBSREDFORD

    ROBSREDFORD Light Load Member

    266
    139
    Sep 2, 2008
    MIDLAND, NC
    0
    There is nothing wrong with 40 pin...if you change back to 70 you will have to change cam gear back....unless looking for a Dyno queen the 40 pin will do fine and once early file is put in it will probably get better fuel mileage than the 70 pin files....IMHO.
     
  5. Blueriger

    Blueriger Bobtail Member

    1
    0
    Oct 18, 2017
    0
    Where on the block are the serial numbers stamped ?
     
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