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What is the best tranny cooler for the 6.2?

Discussion in '1982-Present GM Diesel' started by JORGE, May 3, 2003.

  1. JORGE

    JORGE 1/2 ton status

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    Hi,
    I,m thinking to installla tranny cooler,and i have a lot of doubts.
    For example,the 700R4 behind of the 6.2 engines suffers more cause the diesel works at low RPM,and the Tranny pump sometimes doesn,t moves the fluid enough good for cooling fine.
    I suppouse these trucks will need a heavy duty cooler for his trannies.What is the best?Any of you guys has tranny cooler in his 6.2? Is any kit which comes with a temperature gauge for install in the board?Where can i found a installation diagram?
    Thanks a lot for all your replys. /forums/images/graemlins/thumb.gif
     
  2. bigblock454

    bigblock454 Clack Clack Clack Premium Member

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    In my opinion these are the best.

    http://store.summitracing.com/partdetail.asp?part=BMM%2D70266

    Most tranny coolers are the tube design with small fins pressed on, this is an poor design. In the B&M listed above the tube is the fin so you don't have thermal conductivity issues trying to conduct the heat from the tube to the fin. Did that make sense?
     
  3. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Like bb454 mentioned above, stick with a stacked plate auxilliary tranny cooler. The old tube/fin design doesn't cool as well and aren't built as well. I use a Tru-Cool 22,000 GVW made by Long Inc.(FWIW, they manufacture them for B&M too). The kit comes with all the hose and fittings you'll need.

    Make sure you run the aux. cooler in sequence with the in-rad factory cooler.
     
  4. bigblock454

    bigblock454 Clack Clack Clack Premium Member

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    Like bb454 mentioned above, stick with a stacked plate auxilliary tranny cooler. The old tube/fin design doesn't cool as well and aren't built as well. I use a Tru-Cool 22,000 GVW made by Long Inc.(FWIW, they manufacture them for B&M too). The kit comes with all the hose and fittings you'll need.
    [ QUOTE ]

    Make sure you run the aux. cooler in sequence with the in-rad factory cooler.



    [/ QUOTE ]
    Absolutly, this part is key. When installing the cooler you must first go throught the stock radiator/cooler then into the aux unit. Otherwise you end up heating back up the tranny fluid with the engine coolant.
     
  5. Tybee

    Tybee 1/2 ton status

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    [ QUOTE ]
    Make sure you run the aux. cooler in sequence with the in-rad factory cooler.


    [/ QUOTE ] Ive heard this before, but why not eliminate the stock one? Wouldnt that be harder on the trany, more tubbing to pump through. Also better coolinging for the engine maybe.
     
  6. Hossbaby50

    Hossbaby50 3/4 ton status

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    I have been told not to eliminate the stock cooler because trans fluid will absorb moisture, and if you don't get it hot enough the moisture will not evaporate out of the fluid which is supposed to be bad for the trans.
     
  7. JORGE

    JORGE 1/2 ton status

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    Then,the auxiliary cooler is connected in line with the return hose wich backs to the tranny with cooled fluid,is correct?
    i mean the circuit will be something like this:


    TRANNY-------Radiator-----Aux cooler
    |___________________________|


    ---- =Hot ATF

    ____ = Cool ATF

    Is correct?
     
  8. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    There's another reason to use the stock cooler too. If you live in a cold climate like mine, you can actually OVERcool the ATF if you only run an auxilliary cooler. The stock cooler helps the ATF warm up.

    That's another bonus of using a stacked plate cooler. If the ATF doesn't need cooling it will bypass the cooling tubes. So in extreme cold weather, the stock cooler becomes a tranny warmer and a stacked plate cooler is designed to prevent the tranny from being overcooled.
     
  9. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Looks like you've got the picture(no pun intended /forums/images/graemlins/wink.gif).
     
  10. Tybee

    Tybee 1/2 ton status

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    Thanks for the info. /forums/images/graemlins/thumb.gif
     
  11. Pookster

    Pookster 1/2 ton status

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    Im assuming by "Stacked plate" you mean they are plates inbetween the fins, and by the older style, you mean he ones with fins, but with tubing as the core?
     
  12. OFFRDK5

    OFFRDK5 1/2 ton status Premium Member

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    I myself went with the BMM-70264 because it contains all the parts needed to do the cooler addition. The 28,000 does not include installation hardware. The 24,000 does.
     
  13. bigblock454

    bigblock454 Clack Clack Clack Premium Member

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    Yes, in the stacked the tube is the fin.
     
  14. JORGE

    JORGE 1/2 ton status

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    And for install a Tranny Temp gauge?
    Does it come with any kit?Or is it sold separately?
    Thanks
     
  15. OFFRDK5

    OFFRDK5 1/2 ton status Premium Member

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    It comes with all the fittings and hoses and instructions.

    No guages though. The guage can be bought and put in with ease when you install the cooler. I think some people put 2 guages on. One for out of the tranny and one that goes back to the tranny.
     

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