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  1. #1
    Join Date
    Oct 2006
    North East Ohio

    Default Adding a Transmission cooler

    I just bought a Tru Cool 4454 transmission cooler for my 05 Tahoe with 5.3 engine. It doesn't have the tow package so there is no external cooler. Should I run it in combination with the cooler that goes thru the radiator, or should I bypass that cooler and run it by itself? I bought a 23' boat last year and installed a tranny temp gauge, and noticed when towing on really warm days ( 85-95 degrees) the tranny temp was really getting up there. What have you guys done, or what do you think? Thanks!

  2. #2


    I would keep the radiator cooler and add the TruCool in series with it. Most people don't know that the GVW rating of the TruCool cooler is rated in combination with the radiator. Also taking the radiator cooler out of the picture can make your transmission run too cool in cold climates. Mount the cooler in front of the radiator in the air stream. Use metal straps and avoid the nylon ties that will damage the radiator. This cooler in combination with your radiator will be all you need to tow your boat.
    Don't forget to service your transmission as new fluid runs cooler than dirty fluid. Have fun.

    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
    Join Date
    Oct 2006
    North East Ohio


    Thanks jimmiee, I've already flushed my tranny, and refilled with Mobil 1 synthetic ATF, so I think with the cooler, I'll be protecting my tranny from the dreaded heat!
    Last edited by megapea; 04-09-2010 at 06:46 PM.

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