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  1. #11


    GM's factory coolers really aren't that bad its not like Ford who uses tube and fin coolers on their truck at least GM uses stacked plate coolers. Also it isn't too hard to install a thin aux fan in front of the cooler as long as you watch your clearances. on the late 90's trucks there's over an inch of space between the cooler and grill where a small flex-a-lite fan or pro-comp fan could fit.

    1996 Chevy Tahoe LT 5.7L V8 4X4 205,000+ miles. Built proudly at Janesville Assembly in Janesville, Wisconsin
    Basic mods: Lights all over, bunch of electrical work, and a couple cooling mods.

    Check out my other mods in My Garage:

  2. #12
    Sr. Mechanic
    Join Date
    Oct 2011
    Salt Lake City, UT


    Literally my cooler is the size of a large print paperback novel. On the sticker I have the HD trailering pkg. There is no way in you know where that cooler is what's needed to get the job done. I know, I just completed a 8,000 mile -8 month towing trip (5,500 pound travel trailer) with my truck, and if I would have done it in the summer months I would have had issues based on what my DIC was telling me.

    I am all for giving credit where credit is due, I am all for pointing out when as far as I am concerned GM dropped the ball to save a few bucks on a larger cooler. Of course GM points out that the new Dex6 has been tested up to 275 degrees, my question is how long will the seals last under such conditions?

    A fan will not bring the tranny temperatures down significantly-unlike a larger cooler.

  3. #13

    mfleetwood's Avatar
    Join Date
    Jul 2010
    Denver, CO
    Blog Entries


    Quote Originally Posted by Conlan Rose View Post
    GM's factory coolers really aren't that bad its not like Ford who uses tube and fin coolers on their truck at least GM uses stacked plate coolers. .
    I can see your point, as I did not have any heat problems until after I lifted and put the larger tires on. Re-gearing to 4:56s helped some but the extra muscle it took to move the truck kept my tranny temps higher than what they normally were prior to the changes. But then once I got onto the mountain roads and off-roading, my temps sky rocketed. Once I installed the larger cooler, temps now run cooler than before I lifted and added the larger tires.

    I guess this is one of those situations in which you need the right size for your needs. No sense in spending lots of money for something you'll never use but you certainly don't want to fall short if you're going to get up in there and do the work anyway.

    And nice to know about the fans...I've never heard of anyone doing that; good info!

    Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD

    SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
    BFG All Terrain KO 315/70/17
    DRIVE TRAIN: 4.56 Gears; Detroit TrueTrac Differential; True Cool 40k Transmission Cooler
    PERFORMANCE: DiableSport Predator Tuner; Custom Tuned by Diablew; Magnaflow Exhaust; AFE Cold Air Intake
    ELECTRONICS: Kenwood DNX6180 Touchscreen; Subthump box w/10" Kicker; Driver Information Center (DIC); Rear View Camera
    ACCESSORIES: Westin Brush/Grill Gaurd; Westin Nerf Bars; Truxedo Tonneau; 20% Tint; Tow Mirrors w/Heat & Signals

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  5. #14


    alot depends on the weight and terrain you tow in. also how you drive the truck if you were to have a built truck with a higher stall and tow its a must. i have a 3200 stall and a fully built truck i couldnt even pull 2 quads threw the mountians before mine then i got the tru-cool 40k cooled and now i can pull my dads 5800 pound boat without worrying about heat.
    2004 gmc sierra ext z71 5.3
    KB racing hot pipes 3.5" : 76mm turbo: 4l80e : Circle-d 2b multi disk :Walbro 400 : Racetronix Hotwire kit : TB coolant bypass : Nelson 91 Pcm : Tr 220 Cam : Brian Tooley double springs kit : Ls7 Lifters : Stage 3 heads : Custom Intake Manifold :80lb Injectors : Ported TB : 40k tranny cooler: Plx dm-100 gauge: Auto meter fuel and boost gauge:
    Custom Speedo : Leveling kit :Smoked led taillights and 3rd break light : Black projectors and fogs with hids : Blacked out grille : 33's on 16's : Clarion flip screen: sound que 12" subs: clerion 6x9's : Memhpis amps: Alpine componet set.
    Future mods... Detriot tru-trac, deviels own stage 2 meth kit, MORE BOOST!!!!!!!!!!!!!!

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