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  1. #1

    Default Lag between shift

    Ok shifting from drive to reverse takes almost a full second and back from reverse to drive is just as long. After it goes into gear as soon as i get on the gas there is a thump from the rear end as well. What the hell is going on?? I changed the trans fluid and filter with Royal Purple at 88,000 miles. Any advice??
    2001 Chevy Silverado LT Z71

  2. #2
    Jr. Engineer
    Join Date
    Feb 2007
    Edmonton, Alberta, Canada


    what transmission do you have? 4L60E? if thats the case, do you notce any problems when shifting from 2nd to 3rd?

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  3. #3


    It could quite possibly be slack in the pinion in the rear end. At least that's what the clunk is most likely...

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
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  4. #4
    Legend 2ToNe04's Avatar
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    Apr 2009
    Fresno California
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    install a vette servo sometimes get rid of that little lag

    and its a 40 dollar mod.

    2004 4.8| Custom Paint| Tint| De-badged| Shaved Tailgate| Rollpan| Smoked Tails| Color Matched| Lowered 5/8| Suede Interior| Color Matched Interior| Indash & TVs| Mids-Lows & 2 12" CVRs| 500 & 1100 Interfires| Soundeadener| Outlaw CAI| Magnaflow|
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  5. #5


    You know what im not exactly sure whats trans I have. All i can tell you is its a 2001 silverado LT 5.3 Z71. I havent noticed any issues between gears no. So where can i get this servo?? you got a part number by any chance??

  6. #6


    I would check the fluid. If it's full you may have purchased a defective filter which can suck air through a crack in the pick up tube. Next step is to pull the pan and check it.
    A Corvette servo has nothing to do with your problem as it doesn't apply until the 1-2 shift is commanded by the computer.

    2004 SILVERADO 2500HD LS
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  7. #7


    jimmiee's right also you can check your yoke on the tranfer case if theres no lube in there get some from gm dealer that has been an ongoing issue for alot of the 4x4s over the years

  8. #8


    i have the same shift lag in my truck too and its annoying. the only difference is mine is a 07 nbs

    2007 Silverado Crew Cab
    5.3 L Vortec V8
    LT1 Package
    Driver Information Center (from
    Volant Cold Air Intake
    6000k HID DDMTuning Kit
    LED tailgate bar 3rd brake light
    LED lights for foot wells
    LED Side Bars
    LED Headlight Accents
    Husky Mud Guards

  9. #9


    ive checked the fluid and thats fine. If i drop the pan, can i just re-use the fluid?? i ask only cause its Royal Purple and that stuff isnt cheap =) In regards to the grease, does it have to be from GM or anything equivelant?? I cant believe the 07 STILL has this issue.

  10. #10


    Yes you can reuse the fluid. Drain it into a very clean pan and you'll be fine. Buy a filter from a transmission shop or the dealer to be sure you're getting a real McCoy rather than a cheap off shore imitation.

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