Installed new Trans...Having odd shifting/intermitt speedo issue.....

Discussion in 'Transmission & Transfer Case' started by LOHRTBT, Mar 28, 2015.

  1. LOHRTBT

    LOHRTBT New Member

    Joined:
    Mar 28, 2015
    Messages:
    2
    So here is the rundown :
    04 2wd silverado 5.3 4l60-E
    126k miles. Stock motor and tune

    Just had the trans rebuilt and new convertor (5 miles)
    No hard driving or over 3000rpm yet.

    Proper install and fluid fill was done as well as cooler and line flush to remove contaminates.

    So on the first drive it seems ok but the 1-2 shift seemed a bit high.. 2200-2400 under light accel.
    2-3 and 3-4 seemed to shift a bit sluggish.
    Noticed the sleep was working sometime and not others.

    I have checked to see that all connections are good and they are, we have no extra parts or lines or wires hanging.

    Is it possible that a bad ground could cause this Condition? I was told this but not too sure. If so... Where does the trans ground to and from?

    Or does it point more to the vss?

    I have no ses lights or strange noises. Have driven it a couple miles here and there to see if any change but no luck

    Hope I provided all info needed. Any suggestions welcome
    Dave
     
  2. 04-2500HD

    04-2500HD Well-Known Member

    Joined:
    Mar 19, 2015
    Messages:
    79
    Well if your vss is working intermittently the computer gets confused on the shifts. I would try a new vss. Maybe it got damaged somehow
     
  3. silverado13

    silverado13 Moderator

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    May 1, 2014
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    Baton Rouge
    might want to double check with whoever built it, i build 4l60es on my spare time and ive had that happen, it could be manufactuerer error
     
  4. LOHRTBT

    LOHRTBT New Member

    Joined:
    Mar 28, 2015
    Messages:
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    GOt it figured out, The servo was acting up and we upped the line pressures a tad and all is well.