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  1. #1
    Jr. Mechanic
    Join Date
    Apr 2008
    Lexington, SC

    Default leaking coolant/ trans?

    On my 2005 duramax I seem to have coolant leaking from some where above the trans or the trans itself where it is bolted into the back of the motor. I see it on both sides of the trans on the outer lower bolts. Does anyone have any idea as what it could be? And should it be covered under warranty? Oh and I have checked all the lines that I can see and no leaks.
    2003 Avalanche 4x4 with cladding 110k miles +, K&N stock replacement air filter, Skyjacker 8000 shocks, Hawks LTS pads, Summit Racing brand drilled and sloted rotors, Sylvania ZXE high & low beams, leveling kit, 285/70/r17 Michelin M/S

  2. #2


    It's not the transmission. Something is leaking from the back of the engine. Get a mirror and a flashlight and look behind the engine. Not sure about your warranty. Depends on the mileage.

    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

  3. #3
    Jr. Mechanic
    Join Date
    Apr 2008
    Lexington, SC


    I was thinking that the diesel had a cooling system on the trans dunno for sure though.

  4. #4


    I'm pretty sure the trans is cooled through the radiator and an auxiliary cooler in front of the radiator. In any event you won't know till you look!

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