Thread: transmission cooler

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  1. #1 transmission cooler 
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    Hi

    I have a 05 Pontiac Grand Prix with 200,000 miles and have changed the transmission fluid around 130,00 and its due for another one actually. The person before me probably never changed it at all. I had to change the radiator and put a new one couple of months ago and was curious if I bought a external transmission cooler like a TRU-Cool LPD or Haynes if I still used the transmission cooler that is in the radiator or should I bypass it?

    Thanks
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  2. #2 Re: transmission cooler 
    The Boss Iceman6669's Avatar
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    Im pretty sure you bypass the one in the radiator if you get an after market one.
    97 GTP Sold-prolly rusted away by now
    2011 F-150 Yote powered
    Too Hot to Handle, Too Cold to Hold
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  3. #3 Re: transmission cooler 
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    Also what size transmission cooler should I get? I live in Ohio but the price isn't a factor since I wont to keep my car until it falls apart.
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  4. #4 Re: transmission cooler 
    I live here. theaceofspades's Avatar
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    No you don't bypass the stock one. I have a Hayden 1405 run in series. Saw temps up to 195 and that's it during the summer in traffic and I see like 160 on the highway. Totally worth the 40 bucks I paid and the 12 dollars in hardware to install it
    Quote Originally Posted by theaceofspades View Post
    I now own a stance car parts I just like them DICKS
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  5. #5 Re: transmission cooler 
    GXP Level Member 91parkave's Avatar
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    Bypass
    06 GXP | 222/227 cam/cartuning turbo kit on 8psi/meth/e85 coilovers/ still on stock trans at 130k
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  6. #6 Re: transmission cooler 
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    What extra hardware did you buy? Thanks
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  7. #7 Re: transmission cooler 
    GXP Level Member 91parkave's Avatar
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    Slice the rubber lines- double barbed 3/8ths fittings and fuel injection clamps. And llof course 3/8ths oil cooler hose
    06 GXP | 222/227 cam/cartuning turbo kit on 8psi/meth/e85 coilovers/ still on stock trans at 130k
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  8. #8 Re: transmission cooler 
    GTP Level Member buickman104's Avatar
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    In my experience I would not bypass the radiator. I bypassed it at first because I had a small hose leak on the radiator side. I bought a Haynes trans cooler and ran it directly to the external cooler. During the summer I was fine. In the winter I noticed on my aeroforce that the temperature never went above 100-130 and it took forever to get to that temp. After that I got a piece of cardboard to partially block off the aux cooler in hopes that my trans would run at operating temp. It was somewhat sucessful at getting the trans to the 160-175 degree range but still took forever to get there. Last winter in city driving conditions I was at a light my trans temp was still at 80 degrees and as I pulled away from a light I had slip in 1st gear. I noticed this happened only when the trans was too cold.

    This month I plan on buying new lines and running them through my radiator to my auxiliary then back to my trans. That way my fuild will have no problems getting up to temp.
    2000 Bronze Metallic GTP
    Power :Gen V, 3.6 pulley, 3 inch down pipe, Power log, FWI,and DHP Power Tuner,
    Handling: Vogtland Springs, GMPP sway bars, STBS, 18" Konig backbone, CTS-V Front brakes and GXP rear brakes
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  9. #9 Re: transmission cooler 
    GXP Level Member 91parkave's Avatar
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    Was this Dex 3 you were using ? Newer gp's use the dex6 which is synthetic. Which would be diffrent.

    I've never had a issue even when its sub 10 degree weather.
    06 GXP | 222/227 cam/cartuning turbo kit on 8psi/meth/e85 coilovers/ still on stock trans at 130k
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  10. #10 Re: transmission cooler 
    GTX Level Member industrialfish's Avatar
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    Quote Originally Posted by 91parkave View Post
    Was this Dex 3 you were using ? Newer gp's use the dex6 which is synthetic. Which would be diffrent.

    I've never had a issue even when its sub 10 degree weather.
    FYI, 05 (what OP has) came with Dex 3. 06+ Came with Dex 6.

    I vote run in series because GM cars that came with an auxiliary external cooler like the Impala police car have them ran in series with the radiator.

    Also, Welcome fellow Ohioan, there is quite a few of us here.
    2005 GTP - Graystone Metallic|SPO grills&spoiler/SE lip/Carbon Fiber INFERNO hood
    7"
    Spectre|3.4 MPS|42lb Blue Giants+E85+Walbro 450lph pump
    SpeedDaddys|AL605|Vogtlands on FE3s|Vinnie's Spacers on solid lowers|Intense poly uppers|
    Dorman + Addco sway bars|Drilled/slotted rotors|Plasti-dip 17" QP2 at +27 offset
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  11. #11 Re: transmission cooler 
    GXP Level Member 91parkave's Avatar
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    Quote Originally Posted by industrialfish View Post
    FYI, 05 (what OP has) came with Dex 3. 06+ Came with Dex 6.

    I vote run in series because GM cars that came with an auxiliary external cooler like the Impala police car have them ran in series with the radiator.

    Also, Welcome fellow Ohioan, there is quite a few of us here.
    Doesn't matter the year you can convert to Dex 6.

    Regardless you can run how you want. My logic is simple- I'd rather keep the absolutely inefficient factory brick cooler out the transmission loop. I have yet to see a case where the trans suffered from running colder as compared otherwise
    06 GXP | 222/227 cam/cartuning turbo kit on 8psi/meth/e85 coilovers/ still on stock trans at 130k
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  12. #12 Re: transmission cooler 
    GTP Level Member buickman104's Avatar
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    I have a rebuilt trans running pure and clean dex 6.
    2000 Bronze Metallic GTP
    Power :Gen V, 3.6 pulley, 3 inch down pipe, Power log, FWI,and DHP Power Tuner,
    Handling: Vogtland Springs, GMPP sway bars, STBS, 18" Konig backbone, CTS-V Front brakes and GXP rear brakes
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  13. #13 transmission cooler 
    I live here. theaceofspades's Avatar
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    Quote Originally Posted by 91parkave View Post
    Doesn't matter the year you can convert to Dex 6.

    Regardless you can run how you want. My logic is simple- I'd rather keep the absolutely inefficient factory brick cooler out the transmission loop. I have yet to see a case where the trans suffered from running colder as compared otherwise
    Hmmm maybe I'll go to standalone

    I'll see how winter goes with my torque converter lock
    Quote Originally Posted by theaceofspades View Post
    I now own a stance car parts I just like them DICKS
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  14. #14 Re: transmission cooler 
    GTP Level Member buickman104's Avatar
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    Quote Originally Posted by 91parkave View Post
    Was this Dex 3 you were using ? Newer gp's use the dex6 which is synthetic. Which would be diffrent.

    I've never had a issue even when its sub 10 degree weather.
    And i've had an issue so we are 1:1

    I doubt Arizona sees as much cold ice and snow as the North East.
    2000 Bronze Metallic GTP
    Power :Gen V, 3.6 pulley, 3 inch down pipe, Power log, FWI,and DHP Power Tuner,
    Handling: Vogtland Springs, GMPP sway bars, STBS, 18" Konig backbone, CTS-V Front brakes and GXP rear brakes
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  15. #15 Re: transmission cooler 
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    I put a 404 (I think) in last year in series with the radiator cooling. Check out the pics HERE.
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  16. #16 Re: transmission cooler 
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    Has anyone installed this transmission pan on their Grand Prix?

    http://www.ebay.com/itm/LOW-PROFILE-...-/111197690062
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  17. #17 Re: transmission cooler 
    GTX Level Member industrialfish's Avatar
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    Quote Originally Posted by bryanrhoads77 View Post
    Has anyone installed this transmission pan on their Grand Prix?

    http://www.ebay.com/itm/LOW-PROFILE-...-/111197690062
    You can get a similar one made by Dorman for about $35
    2005 GTP - Graystone Metallic|SPO grills&spoiler/SE lip/Carbon Fiber INFERNO hood
    7"
    Spectre|3.4 MPS|42lb Blue Giants+E85+Walbro 450lph pump
    SpeedDaddys|AL605|Vogtlands on FE3s|Vinnie's Spacers on solid lowers|Intense poly uppers|
    Dorman + Addco sway bars|Drilled/slotted rotors|Plasti-dip 17" QP2 at +27 offset
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  18. #18 Re: transmission cooler 
    I live here. theaceofspades's Avatar
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    Quote Originally Posted by industrialfish View Post
    You can get a similar one made by Dorman for about $35
    I think I'll get one next pan drop
    Quote Originally Posted by theaceofspades View Post
    I now own a stance car parts I just like them DICKS
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  19. #19 Re: transmission cooler 
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    You do an "in-series" where you include the radiator in the system. In this setup, I like to think of the trans fluid temp chasing your engine temp with some additional cooling provided by the auxillary cooler. All in all you'll likely see your trans fluid temp about 15-30 deg cooler. One upside, for those of us in cooler climates, is your radiator will help warm your trans fluid and bring it up to normal operating temps quicker during winter. This is the setup I have in my 2008.

    Or you can do a "standalone" where the radiator is not included in the transmission fluid cooling. This will likely provide better cooling in the summer since your trans fluid will not be running through your hot radiator. However, you will not benefit from the hot radiator in the winter and you may find you trans fluid temps staying very low. Also, I don't know how to appropriately size a standalone setup to prevent and overheating situation.

    If you'd like more information, you should be able to search out some threads. I know I've had a couple that got into some very detailed discussion. Let me/us know if you have further questions!
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  20. #20 Re: transmission cooler 
    GXP Level Member 91parkave's Avatar
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    Quote Originally Posted by buickman104 View Post
    And i've had an issue so we are 1:1

    I doubt Arizona sees as much cold ice and snow as the North East.
    I've been standalone for years when I was stationed in Colorado I had no issues. Your 1st gear slip could be attributed to much more than temps.
    06 GXP | 222/227 cam/cartuning turbo kit on 8psi/meth/e85 coilovers/ still on stock trans at 130k
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