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  1. #1

    Default 03" Silverado Transmission Problem....

    my 2003 Silverado z71 ls shifts fine when it is less then 40F outside but once is get over that the trans temp comes up and it starts holding in 2nd gear for until the rpms go up, it don't slip but just holds if I push the tow/hall button it shifts fine also. I changed the shift solenoids and nothing changed. can anyone tell me what i should go after to fix this?
    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


    I am not a transmission expect by any means, but if I was you, I'd try a fluid flush first.

    Under $100 and if not changed recently, it can not do any harm.

    Edit: just re-read your post, if you've changed solenoids, you have probably installed fresh fluid. Sorry, gotta learn to read the whole post.

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  3. #3


    I should have said I changed the fluid and flushed the radiator/cooler, I'm heading down to the auto parts right now to buy a new extra cooler to try that also, I'm trying to get this figured out as I'm heading out on a road trip in 2 weeks going to be driving around 4,000 miles in a week, I have been dealing with this for the last 55k miles and would like to not have to worry once i get into the 100F + temps

  4. #4


    Do you know what the trans temp is when you have this problem?

  5. #5


    With this shifting issue Only happen when the Truck is warm??......also is the shift, a Harsh 1-2 Up-Shift??


    5.3 l 3.73 l G80

  6. #6


    its when the trans get to the same temp at the engine so like around 180.

    and nope it just hangs in gear then after a short bit and a 800-1000 rpm clime it will shift smooth in 3rd
    but if i don't keep pushing the peddle further and further is will just keep the rpms high and not shift at all

  7. #7


    Do you know if it has a Throttle position sensor? My 03 yukon xl would also ride out second gear for a long time. I posted the problem here and someone recommended checking the tps. Unfortunately, my 03 did not have a tps and I wrecked the truck before resolving the issue.

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors,
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  8. #8
    Jr. Mechanic
    Join Date
    Mar 2013


    what color was fluid?

  9. #9


    the fluid was dark red looked almost brand new

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