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  1. #1

    Default 99 yukon shifts hard 1st to 2nd

    I have a 99 Yukon, around 133k, just replaced the ujoints. The truck still shifts hard between first and second gear, sometimes hard, sometimes not bad at all. Trans fluid is fine, when I changed the ujoints, I discovered some play in the transfer case when turning each axle. A slight clicking sound like there was play in the gears. Would this cause the truck to shift hard between 1st and 2nd or is something else a problem? Thanks...

  2. #2
    Jr. Engineer
    Join Date
    Jan 2009
    Location
    Rochester, MN
    Posts
    231

    Default

    Get it scanned for codes. A lot of transmission codes will not make your check engine light come on. My truck shifts really hard and I never knew why until I decided to check for codes even though my check engine light wasn't on. I ended up finding a P0748 I think which was PC Solenoid circuit. Because the PC Solenoid is not working, the computer automatically demands maximum line pressure which is causing my hard shifts.
    99 Silverado Z71 4.8
    2" Suspension lift (Add-a-leafs and leveling keys)
    Long tube headers with 3" offroad Y-Pipe
    Volant Cold Air Intake with Ram Air Intake Tube
    Jet Mass Air Flow Sensor
    Diablosport Predator Tuner

    Previous Truck:
    97 Suburban K1500
    3" Body lift
    2" Suspension Lift (Add-a-leafs and cranked up torsion bars)
    35" Yokohama M/T's
    K&N Intake
    Airraid Throttle Body Spacer
    Hypertech Programmer
    Dual Flowmasters

  3. #3

    Default

    Quote Originally Posted by mjalstad View Post
    Get it scanned for codes. A lot of transmission codes will not make your check engine light come on. My truck shifts really hard and I never knew why until I decided to check for codes even though my check engine light wasn't on. I ended up finding a P0748 I think which was PC Solenoid circuit. Because the PC Solenoid is not working, the computer automatically demands maximum line pressure which is causing my hard shifts.
    Yes many codes never turn on the Check Engine Light. Don't drive your truck too long without fixing the code or the high line pressure can cause your sun-shell to break. Once this happens you will have no reverse and no 4th gear.
    Jim

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows



    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  4. #4

    Question 99 yukon shifts hard 1st to 2nd

    When was the tranny last serviced? Might be something that simple.

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