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trans cooler overkill?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BillyBob, May 16, 2001.

  1. BillyBob

    BillyBob 1/2 ton status

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    Just wondering, but can you actually overdo it with the size of a trans cooler? I have a 700 R4 in my 84 (been rebuilt) and it already has a cooler in it. But it's a super small weenie cooler. About what size should I get? I'll probably want something for towing, and something that could hold up to the megashifter if I wanna have some fun [​IMG]. Any ideas?

    <A target="_blank" HREF=http://billybob.coloradok5.com>http://billybob.coloradok5.com</A>
    If it ain't leaking oil, it ain't my truck![​IMG]
     
  2. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    I believe the general opinion here is that bigger is better when you're trying to keep a 700r4 cool...........I run a Tru-Cool 22,000 GVW auxilliary cooler in mine. It's similar in construction to the B&M. Try to stay away from the aluminum tube/fin design- thy're not as tough and don't have any built-in bypass if a blockage ocurs in the cooler.



    <font color=red>PHOTO ALBUM-</font color=red> <A target="_blank" HREF=http://albums.photopoint.com/j/AlbumList?u=1289798>http://albums.photopoint.com/j/AlbumList?u=1289798</A>.......<font color=blue>TRUCK & HIKING PICS</font color=blue>
     
  3. gokartergo

    gokartergo 3/4 ton status Staff Member Moderator

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    From what I have read. You should get one that is rated at 24,000 GVW. Check out this site you might be able to tell what yours is rated at by looking at the sizes.........Dan <A target="_blank" HREF=http://www.perma-cool.com/Catalog/Cat_page05.html>http://www.perma-cool.com/Catalog/Cat_page05.html</A>
     
  4. Thunder

    Thunder 3/4 ton status

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    The only time I think you can overdo a trans cooler is if you live in cold climate and have a huge cooler that is not also running fluid through your stock raidator cooler. Transmitions have a temprature operating range just like an engine. If trans fluid is too cold it doesn't flow well and can cause high pressures which can damage seals, cause harsh shifting and other problems over time also cold thick fluid is very hard on the pump.
    Many people who run large coolers in cold climates use a thermostat valve that routes the fluid through the stock radiator cooler to keep it warm when the weather is very cold. And when it gets warmer it bypasses the stock cooler.
    I use my Blazer with a 700r4 to tow a 18 foot ski boat, small travel trailer, and toy trailer. I am running a 18000 GVW heavy duity cooler. It works good and keeps the trans in its opreating range no mater what the temp is.. It is the smallest cooler I would recomend running. I also use it in conjunction with the stock cooler in my radiator.
    Most coolers are designed to be used along with the stock cooler. But if you decide to bypass the stock radiator cooler. Get the biggest cooler you can find.
     
  5. prjt_blzr

    prjt_blzr 1/2 ton status

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    A friend of mine runs an old freezer condensor. This thing is as big as the rad. He has run this setup since 1977 when he bought the truck new. He currently has about 400,000 miles on the factory TH400. The trans has not shown any odd behaviour from this oversize cooler and he lives in the northeast. I personally run a 28,000GVW cooler in my truck. I'm not sure that you could overcool any trans let alone a 700.
     
  6. MudFrog

    MudFrog 1/2 ton status

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    Here is the combo I plan to run in the next month. For tranny cooler I'd like to go with the B&M 28,000 GVM cooler.... http://www.permacool.com/Catalog/Cat_page25.html.

    89 K5 Silverado
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  7. mrivan

    mrivan 1/2 ton status

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    I always figured that you could use an aoto air conditioner radiator for a super duty tranny cooler ,I pull a fire wood trailer with my 454 conversion 2wd Blazer . As we live in the coastal mts. of OR. the grades are super steep and with a fully loaded trailer of green wood that fluid gets hot quick even with the fairly large cooler I installed......
    Mrivan..............
     
  8. Twiz

    Twiz 1/2 ton status

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    You can over cool a trans! (its hard to do, but possible)

    A trans needs to get to at least OVER 100 deg f. to boil out any water that may have acumulated. Water and oil do not mix and water is not a very good lubricant. A trans is vented to outside air, so when it gets hot, the hot air has somewhere to go. When it cools down, it will suck air and moisture in the air into the trans.

    In colder climates, sometimes running fluid to the cooler BEFORE the radiator will help keep the trans in opperating temps. The cooler will pull out the excess heat, then as the trans fluid flows threw the radiator, the coolant will raise or lower the trans fluid temps as needed.

    -In hotter climates, towing or long trips. run the cooler AFTER the radiator
    -Normal Torque converter temps are around 300 deg f.
    -Radiator/engine cooling is primary, all other coolers come second.
    -700R4s need a external cooler of some type.
    -Make sure your radiator is in good working order
    -Normal opperating temps of a trans (depending on where the temps are measured) should be around 170-250 degs f.
    -300+ deg. f. is to hot for a typical auto trans.

    Twiztid
     
  9. mpascino

    mpascino 1/2 ton status

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    I was going to use my AC condensor as a tranny cooler since I pulled the AC out to do on board air. Is this a bad Idea?

    You call that dirty!?
     
  10. Twiz

    Twiz 1/2 ton status

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    IMO

    yes
     
  11. OFFRDK5

    OFFRDK5 1/2 ton status Premium Member

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    I am running the B&M 24,000 tranny cooler. Came with everything I needed and keeps it cool.


    SK-15
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  12. prjt_blzr

    prjt_blzr 1/2 ton status

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    I would not use the A/C condenser from the vehicle for a trans cooler. The passages seem to be restrictive. The one in my post was from an old freezer and had larger tubes that were placed closer together than the A/C condenser. It was also a headered setup so that a blocked tube would not stop the fluid flow. I've got no idea what exactly this thing was from as this was done in 1977. When I put my cooler on the highest GVW cooler that I found was from B&M. It is rated at 28,000GVW. I think that I got it from summit.
     
  13. FastEddy

    FastEddy 1/2 ton status

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    A friend of mine has been running an a/c condenser for a trans cooler for a couple years in his off road contraption with a 700R4 and it has been trouble free (knock on wood) we mainly are crawling (or flying) through mud and the truck see's more low speed but with 40 inch tires etc we figured bigger is better. I do understand what others are saying about blocked tubes but if you have particles that big in your trans you have some major trauma anyway happening inside. our fluid gets changed a few times a year (usually after being totally submerged, looks more like a strawberry margarita than trans fluid. just my 2 cents...ED
     

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