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  1. #1

    Default 03 Silverado Transmission Slipping

    I have a 2003 Silverado Z71 5.3l 4l60e. when I take off it shifts from 1-2 fine then when I get to 2-3 the RPM's go up about 3k then drop back down and then it shifts to 3rd it stays in 3rd great and the shifts 3-4 great. I changed the trans control solenoids for 1-2 and 2-3 but its still doing the same. Can someone please let me know what to go after next?
    Last edited by CoDaChrome; 12-10-2011 at 01:48 PM.
    Corey M (CoDaChrome™)
    the vehicles I have/had
    1989 GMC 2500 4wd (Sold)
    1989 Palomino hard-side popup
    1990 GMC 2500 pickup 2wd
    1993 Jeep Grand Cherokee Limited (Beater) (sold)
    1997 GMC jimmy sle 4wd (Sold)
    1999 Silverado Z71 offroad
    2000 Sunline 30' travel trailer
    2003 Silverado Z71 offroad
    2006 Yamaha wolverine 450 4wd

  2. #2
    Sr. Engineer
    Join Date
    Dec 2011
    Location
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    Default

    Not too keen on trans but know some .. usually a slow shift from 1 to 2 or 2 to 3 .. means trans needs rebuilt.
    If it was 3 to 4 clutches are shot. What i,am thinking... not sure.

  3. #3

    Default

    Can anyone tell me what changes when you push the tow/haul button on the shifter? when I push it my shifting from 2-3 seems fine. as soon as i turn it back off its back to slipping.

  4. #4

    Default

    Quote Originally Posted by CoDaChrome View Post
    Can anyone tell me what changes when you push the tow/haul button on the shifter? when I push it my shifting from 2-3 seems fine. as soon as i turn it back off its back to slipping.
    When the Tow Haul is engaged, it Raises the Line Pressure and the Shift RPM..........It raises the Shift RPM by delaying the Shift Timing.......This is to help Eliminate the Repeated of up and down Shifts in the Transmission,

    The Main Goal of the Tow Haul Mode, is to Reduce the amount of Heat Generated, and the Reducing of as much Wear on the Components as Possible.
    Last edited by 99'HEARTBEAT; 12-26-2011 at 08:39 PM.

    MIKE


    99"SILVERADO
    5.3 l 3.73 l G80
    BLACK BEAR CUSTOM TUNE
    SNUGTOP l COLORMATCH l KATZKIN










  5. #5

    Default

    I am no expert but having just gone through this last week, its not going to get better, go get it checked out before it gets worst...mine went from fine to crapped out while i was at work, barely made it home, 1 and 2 slipped, 3 and 4 were gone...

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