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  1. #1

    Default 4L60 transmission issue

    Hello,

    I have a 95 1500 Suburban with 4L60 tranny. It seems to be having some issues where when I put it in OD to drive normal pace, it quickly shifts into the highest gear right after the initial pick up. When I try and press the gas pedal to the floor, the tranny still will not shift to the next lower gear so the truck can have a better pick up speed.

    I have already replaced the filter and trans fluid few months ago and I may have over fill it, not 100% sure. Could this be the case that's causing it? Does anyone here may have experienced this issue before?

    Your help will be greatly appreciated.

  2. #2
    Legend Mean_Green_95's Avatar
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    Default

    being overfilled could possibly cause that. My friend bought a Jeep Grand Cherokee and the trans was overfilled. He said it wasn't shifting properly and when it did shift it was hard. We sucked out some of the fluid and he said that that fixed the transmission problem totally.
    2010 Equinox LT
    2.4, 6 speed auto, power lift gate, remote start, bluetooth, xm.

    1995 Cheyenne C1500 ext. cab(my baby, my first truck)
    5.0, 5 speed, Silverado appearance package, power nothing, bucket seats and console Silverado, painted black interior, eBay halo headlights, eBay chrome tails, eBay cai, dual Flowmaster 40's w/no cats, 15x7 American Racing Hopsters, Walmart fog lights, SS mirrors

  3. #3

    Default

    Your problem sounds like a stuck TV valve. Look for your TV cable which goes from the throttle body to the transmission. Once you find the cable you want to try to free the valve. Hold the engine at a steady 2000 RPM and then rapidly pull and release the TV cable in and out as fast as you can about 20 times. This in many cases will free up your TV valve. The TV valve is the valve you need to downshift the transmission when you floor the gas pedal.

    The transmission being over full should have no effect on kick down but you should make sure it's not over full as this can start a fire and burn up your truck.
    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

    Default

    Thank all for your reply. I will check on that.

    What exactly is a TV valve?
    Last edited by mug23; 05-29-2009 at 09:33 AM.

  5. #5

    Default

    The TV valve tells the transmission where your foot is on the gas pedal. When you floor it the TV valve downshifts the trans to a lower 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

  6. #6

    Default

    Hummm, I can't see to find the cable. The cable i see is attached with the throttle cable. The thing is, when I put in 4H instead of 2H on the transfer case, the truck shifts normal. Once I place it back to 2H, it still shift very very quickly to the next higher gear and it feels like I'm riding in OD all the time.

    I'm stuck...

    Thanks,

  7. #7

    Default

    If you don't have a cable then you have a 4L60E. Now that you mention it shifts OK in 4 hi but not 2 hi you may have a wiring problem where your computer thinks you are in 4WD Low range when you are in 2 WD. This problem is not an uncommon one. Have you inspected your transfer case connectors? I would unplug and check for corrosion at all the connectors and inspect your wiring harness for abrasions.
    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

  8. #8

    Default

    I forgot to add one important thing. When your truck is up shifting quickly in 2WD Hi if you were to watch your truck data on a scanner you would probably see the computer is displaying 4WD Low when it is actually in high range. A bad 4WD Low switch can cause this as well as a wiring or connector problem.
    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

  9. #9

    Default

    Thank you very much for your replies. I believe you maybe correct as the mechanical is working correctly and I'm pretty sure there's nothing wrong with the transmission itself.

    I will check the wiring to see. I have a 500 mile trip coming up with towing my race car and I need to get this fix. If not, I guess I will have to do the shifting myself.

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