Adapting oil cooler to trans cooler 4L80E. . . - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 17 (permalink) Old 06-28-2009, 01:43 PM Thread Starter
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Adapting oil cooler to trans cooler 4L80E. . .

I was junk yard hopping this weekend for a trans mission dip stick tube well i found that and a wrecked 6.5-T truck and the engine ans trans were missing truck had 317K on the ODO which is now the second 6.5 i have seen over 300k. . . Very nice

So anywho i noticed they left the trans and oil coolers on it, so i got to looking and thought about adapting and mounting the the larger cooler where my current trans cooler is. . .

My trans guy said i would have to bring the cooler in so he could run some additive and ATF threw it for a while to remove the motor oil and contaminates but he said it should and has worked with great success in the past.

Mike

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post #2 of 17 (permalink) Old 06-29-2009, 11:15 PM Thread Starter
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So will a larger cooler help the 4L80E at all ?
whats your views on larger coolers on these transmissions ?


Mike

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1971 AMC /Jeep J4K-DRW.
1988 AMC /Jeep Comanche.
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post #3 of 17 (permalink) Old 06-30-2009, 06:54 AM
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Blow the cooler out with air - both directions and catch the results on a newspaper or something like it, fill with solvent ( naptha, paint thinner, acetone........). A turkey baster will provide agitation but leave it soak overnight. Blow it out and check for unwanted contents.

Use a full flow oil filter and change with the engine oil schedule.

keydl

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post #4 of 17 (permalink) Old 06-30-2009, 10:52 PM Thread Starter
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the trans shop was going to hook the cooler right to there flushing machine and run some solvents threw it along with some ATF, then after that they want me to do a fluid n filter change when i install the cooler then run a few 100 miles then drop the pan and change the filter once more that seems to be spot on with your suggestion. . .

Mike

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post #5 of 17 (permalink) Old 07-01-2009, 11:33 PM
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If you use a spin on filter head in the line all you need to do is change the filter and cut it open to look for trash.

I prefer to see the contents, the flushing machines that I have been near don't give a sample to show. If it is old engine oil - no problem, but add bearing gold and it may overload the trans filter. With a spin on going to the cooler inlet it will pick up all the trash, after you run 1k miles or so and cut a filter to find no trash I would repipe to the trans outlet so that trans failure does not kill the cooler.

For regulat service - just change the filter and suck the pan dry through the dipstick and fill it up with new. Every 100k or 5 years drop the pan to look at the filter unless it is a screen.

keydl

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post #6 of 17 (permalink) Old 07-06-2009, 04:21 PM Thread Starter
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thank you much for your help, most helpful good info . . .

Mike

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post #7 of 17 (permalink) Old 08-02-2009, 08:26 PM Thread Starter
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I still haven't gotten around to this my 4L80E start doing some funky thing's so i haven't gotten to this but i will update it when i do. . .

Mike

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post #8 of 17 (permalink) Old 08-13-2009, 12:19 AM Thread Starter
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I started the process of flushing the cooler out. . . so far so good it take a alot to flush diesel oil out of a cooler. . .I am hoping to install it this weekend. . .

So will i notice difference in operation with the 50% larger cooler ?

or

will it drive about the same just be running colder ?

Mike

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1971 AMC /Jeep J4K-DRW.
1988 AMC /Jeep Comanche.
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post #9 of 17 (permalink) Old 08-13-2009, 12:44 AM
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From my experience with transmission coolers the transmission will behave the same, but run cooler. The one exception being if the transmission overheated constantly with the old cooler, you will notice a difference.

One other thing to consider, I dont know how cold it gets where you live, but my trucks behave different in the cold with the stock coolers. With a bigger cooler, your transmission may behave different until it gets up to temperature.

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post #10 of 17 (permalink) Old 08-13-2009, 02:01 AM Thread Starter
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The truck normally runs about a half hour before i drive it during the winter months, normally it just goes from 1 side of the street to the other with a trip into town once a week, Unless it snow then it goes to work n back . . .

i'm not sure if its been over heated, i am doing this as a preventive measure, would the over sized trans pan be over kill with the larger cooler ?

Mike

1953 REO M48 w/w.
1962 GMC C45.
1969 AMC AMX -390.
1971 AMC /Jeep J4K-DRW.
1988 AMC /Jeep Comanche.
1991 Dodge RamCharger.

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Last edited by M123KT-450; 08-13-2009 at 02:04 AM.
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