Transmission cooler help

Transmission and Drivetrain Tech

  1. downsr

    downsr FABO Gold Member FABO Gold Member

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    I mounted a trans cooler in front of my radiator. It runs about 10 degrees hotter in traffic now.
    Should I have a space between the cooler and radiator ? It is flush against the radiator now. Or can it be mounted some where else. Its in a 70 duster 340
     
  2. halifaxhops

    halifaxhops It's going to get stupid around here! FABO Gold Member

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    I would find another area it can be mounted. Sounds like it is blocking the radiator's cooling area and also the heat from the cooler is transferring to the radiator.
     
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    • memike

      memike Super Moderator Staff Member FABO Gold Member

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      I have seen them mounted inside the front inner fender (in front of the tire)
       
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      • ir3333

        ir3333 Well-Known Member

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        are you sure you need an external cooler?
        The stock line goes through your rad to heat your transmission fluid.If you are not racing and don't have a hi stall converter you probably don't need one.
         
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        • famous bob

          famous bob mopar misfit FABO Gold Member

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          All of the above. I don't know about inside the fenderwell (flying rocks?).
          I always mount the extra cooler as far away from the rad as possible. I have mine running thru the rad first, then the cooler and back to the trans.
           
        • mopardude318

          mopardude318 Well-Known Member

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          • roccodart440

            roccodart440 Well-Known Member

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            I mounted min in the front wheelwell and it has an electric fan.
             
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            • mopardude318

              mopardude318 Well-Known Member

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              the other side...

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              • transman

                transman Well-Known Member

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                On both of my cars, I used a Long cooler (also sold under the b & m and various other names). It is a radiator style cooler. On the duster, I made a some angle brackets and bolted it to the rad cradle. There are enough holes in the cradle from the factory, that with a little imagination you don't have to drill any additional holes in it. I also used this approach on the Challenger. This kept the cooler off of the rad, but still in the direct air flow through the grille. Mounting a cooler directly on the rad helps the radiator shop down the road. Nothing like a cooler full of oil bouncing up and down on your radiator fins. :lol:

                For a transmission oil cooler to do it's job properly, it must be in the direct air flow through the grille.
                 
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                • transman

                  transman Well-Known Member

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                  It's funny, but on late model cars, the experts at various seminars I attended said that was the wrong way. Late model transmissions in a lot of vehicles have a temp sensor and should the oil be too hot or too cold, issues could arise. Apparently the factorys' do not want the transmission oil temperature to vary very much. Therefore, cooler oil is directed back through the rad to heat it back up to proper operating temperature. Sounds stupid to me, but these then there is a lot of stupid in these new cars.
                  Only older units though, your method of rad first and then cooler is the correct way to do it.
                   
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                  • downsr

                    downsr FABO Gold Member FABO Gold Member

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                    Thinking about mounting it somewhere instead of in front of radiator. It has a 3k stall . I have a street rod that it goes through radiator then through cooler. The cooler is mounted on body by rear of transmission.
                     
                  • RogerRamRod

                    RogerRamRod The Older I Get, The Faster I Was

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                    What else changed? Simply adding a cooler alone shouldn’t cause it to run hotter no matter where it is. Too small of a connection tube or hose? A kink in the line causing slowdown of fluid? Was cooler used-possible internal blockage?
                    Did you bypass the original in the radiator? If so, new unit might be too small.
                    10 Degrees isn’t much, so it wouldn’t take much of a fluid slow down. Obviously a full kink would seriously impact flow and cause more than a 10° rise.
                     
                  • downsr

                    downsr FABO Gold Member FABO Gold Member

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                    It's blocking some of the air flow through the radiator. It is run through radiator then trans cooler.When its 90 degrees outside and your sitting in traffic 10 degrees makes a difference
                     
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                    • furyus2

                      furyus2 Well-Known Member

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                      I have a B&M cooler in front of my radiator. Car is my 64 Sport Fury with a 26 inch radiator with a shroud, and a Summit SS 18 inch fan. The trans cooler is about 3 inches in front of the radiator. Also I ran the fluid lines through the radiator first, then the cooler. No overheating issues. Runs at 180. Rises to 190 sitting at a light. Not sure what your combo is, but maybe the cooling system is marginal, and this change affected the temp. As was said, mounting to the radiator could cause the tubes to wear through. I would just move the cooler away from the radiator, and maybe route it through the radiator.
                       
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                      • RogerRamRod

                        RogerRamRod The Older I Get, The Faster I Was

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                        Ok, engine is 10 deg hotter, it was early, I was thinking the trans was hotter.
                        And
                        I know 10° makes a difference, I was saying that it’s not much, so it wouldn’t take much wrong to make that difference.- especially since I was thinking you were talking trans temp.
                         
                      • 70DusterBob

                        70DusterBob Well-Known Member

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                        I'm running a 360 w/a 26" 3 core rad, dual 12" electric fans, and a trans cooler about 3 inches in front of the rad. It never needs the fans unless I stop running a 160 thermostat. The fans come on at 180 and turn off around 190. No problems with this set up at all and I'm driving in 100+ temps. The rad fluid doesn't go through the 26" rad, but my trans cooler is about 24" wide 1' tall and over 1" deep.

                        I wonder if your rad is not big enough, not clean enough, or if you don't have a shroud on it. Just wondering. That is the only reasons I can see why it wouldn't cool, but then again it is entirely possible that the rad is too close, that and if it is on the rad, it probably most likely would damage it eventually.
                         
                      • downsr

                        downsr FABO Gold Member FABO Gold Member

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                        I am going to move it off the radiator .Put a space between it and the radiator .It is blocking some of the air flow going into the radiator. Thanks to every one for the help
                         
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