How to tell which 3406 model I have.

Discussion in 'Ask An Owner Operator' started by Bkadds, Oct 11, 2014.

  1. Bkadds

    Bkadds Bobtail Member

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    Oct 11, 2014
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    The head has stamped 346c. Does that mean I have a c model? What oil do you all run in differentials, hubs and transmission? Thanks.
     
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  3. damutt

    damutt Road Train Member

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    May 6, 2013
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    post pics of hte pass and drivers side of the block,
    tranny (assuming its an eaton-fuller) is full syn gear oil
    hubs no clue
    diffs no clue
     
  4. SL3406

    SL3406 Medium Load Member

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    Jan 10, 2011
    Oklahoma
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    Post the engine serial number.
     
  5. milskired

    milskired Road Train Member

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    Plainfield, IL
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    Hubs and diffs are 75-90 synthetic. Transmission is straight 50 weight synthetic.
     
  6. Bkadds

    Bkadds Bobtail Member

    11
    1
    Oct 11, 2014
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    Where would the engine serial number be? Thank for the replies!
     
  7. damutt

    damutt Road Train Member

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    Esn shld be on a sticker on the valve cover. Snd I thibk on side of block
     
  8. Rodeoman7

    Rodeoman7 Light Load Member

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    May 27, 2008
    Middle of Nowhere, CO
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    SN is passenger side of block under #5
     
  9. Bkadds

    Bkadds Bobtail Member

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    Oct 11, 2014
    0
    Will look tomorrow and post.
     
  10. Bkadds

    Bkadds Bobtail Member

    11
    1
    Oct 11, 2014
    0
    Engine valve cover just says 3406 economy and I have looked everywhere for a serial number to no avail.
     
  11. kwswan

    kwswan Road Train Member

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    mcminnville,tn.
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    Call the dealer for your brand of truck & give them the vin# & they will be able to give you the engine serial number.
     
    Cetane+ Thanks this.
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