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4L60E reverse going bad, need info on exact modelto look for

Discussion in 'All Other Transmissions' started by Drago, Nov 7, 2016.

  1. Drago

    Drago Active Member

    609
    179
    Oct 25, 2011
    Virginia
    4L60E reverse going bad, need info on exact model to look for. I got an odd duck, It's a 95 GMC 6.5L Nat Asp with a 4l60e tranny. It was a custom order for Va DOT fleet. just a quick look on the innernets shows me that not all 4l60e 's are the same. Is there a data plate somewhere under the muck that will let me know exactly what I need?
     
  2. THEFERMANATOR

    THEFERMANATOR FRANKENBURBAN Staff Member Lead Moderator

    8,480
    1,540
    May 9, 2008
    ZEPHYRHILLS FL
    Double check as GM supposedly never put a 4l60e behind ANY 6.5L(even n/a). So be absolutely certain what trans you have 1st as it should be a 4l80e.
     
  3. THEFERMANATOR

    THEFERMANATOR FRANKENBURBAN Staff Member Lead Moderator

    8,480
    1,540
    May 9, 2008
    ZEPHYRHILLS FL
    If it is in fact a 4l60e, 95 is a 1 year only. For a 4l80e, 95 and 96 directly interchange, but 97+ can also be used by modifying the trans cooler lines.
     
  4. Drago

    Drago Active Member

    609
    179
    Oct 25, 2011
    Virginia
    the Tranny shop owner was shocked when he saw the 4l60 in it, is there a difference between a GMC 4l60 and a Chevy 4l60? I remember the only dif for the old 350s and 400 trannys was the shape of the bell housing.
     
  5. THEFERMANATOR

    THEFERMANATOR FRANKENBURBAN Staff Member Lead Moderator

    8,480
    1,540
    May 9, 2008
    ZEPHYRHILLS FL
    No difference, just has to be a 95. I would double check yourself as the torque output for even a 6.5l n/a was supposed to be more than a 4l60e was rated at.
     
  6. Drago

    Drago Active Member

    609
    179
    Oct 25, 2011
    Virginia
    I've seen several of these VaDOT trucks with the trannys sitting in the bed
     
  7. Will L.

    Will L. Well-Known Member

    5,802
    3,138
    Jan 25, 2013
    Boulder City Nv
    Look at the pan. All square is 60. Two corners cut off is 80.
    Search pan gaskets and youll se what im saying.

    Btw pan is quickest way to see difference in th350 VS h400 also. Pan is how I id any gm trans.
     

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