External transmission cooler or not ? And how set up ?
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Thread: External transmission cooler or not ? And how set up ?

  1. #1
    1000+ Posts Beano's Avatar
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    Default External transmission cooler or not ? And how set up ?

    For the past umpteen years I have had an external transmission cooler fitted to my 505, think it is a good thing and recommend them to other people.

    I am currently helping someone with their Commodore and don't want to give bad help or advice.

    Recently my thinking has been challenged by various online opinions about trans cooler setup.
    Some people think they cool the oil too much and recommend putting them in series with the original setup going through the radiator. These setups eventually have their own problems though as they can leak water into the trans fluid.

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    What do you guys think on the issue ? Clearly the original setup is not adequate, and at least an in-series is indicated, but does an external cooler by itself cool the oil (and thereby the transmission itself) too much ?
    As far as I know, they like being warmed up rapidly like an engine being warmed up rapidly by the action of the cooling system thermostat.
    Lasya likes this.

  2. #2
    1000+ Posts pgti6's Avatar
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    I've been running with an external trans oil cooler on my 6 cyl Falcon, 4 speed auto (BTR?) for about 5 years for towing my race car. Trailer and race car are about 1500kgs.
    I bypassed the radiator for the reasons you mention and have had no issues with the cooler temps it must be running at, especially in Winter.
    Gear changes are as smooth as pre cooler, so a sensible upgrade for my use (towing) IMO.
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  3. #3
    1000+ Posts Beano's Avatar
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    That's logical....towing puts a lot of strain on a car, generating a lot of heat.

    How about with a car that will not be towing ?

  4. #4
    1000+ Posts alan moore's Avatar
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    I also put an external trans cooler on my BA 6 cal Falcon. It did tow my race car, but mostly was just used on the 38klm 1 way commute to work and back. Over the next 150 k and some years of use, certainly the auto stayed in good order with very little material on the magnet in the pan. Sold it at 190 k still in good shape.

  5. #5
    1000+ Posts driven's Avatar
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    Here are the ins and outs for older vehicles

    As good as many General Information - The Transmission Centre

    Current model vehicles extreme care required with mods
    Kim Luck and Beano like this.

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