How to do a 6.0 cooler? - Ford Powerstroke Diesel Forum
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Old 01-06-2013, 08:06 PM
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How to do a 6.0 cooler?

I have a 7.3 with 4r100 trans that loves to run hot.

What's involved and cost to go with a 6.0 cooler?

Thanks in advance!!!
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Old 01-07-2013, 05:29 AM
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how hot is it running? A lot of things could be going on, there is a line that runs between the cooler input and return line, it has a ball check valve, if the spring gets weak it will just return the heated fluid back to the trans instead of sending it to the cooler. A 6.0 cooler is great but if you have a trans issue it will just mask it a little but your issue will get worse.

I watched ebay and picked up 6.0 cooler still in the Ford package for 175 shipped.

As far as changing it, it is relatively easy, I will try to find the document I used, it may have been a post on here. I will post it up as soon as I find it.
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Old 01-07-2013, 05:36 AM
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Here is a good write up.

http://powerstrokenation.com/forums/...ad.php?t=15508
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Old 01-07-2013, 05:41 AM
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This Is How to Install Your 6.0 Trans Cooler- My Detailed Write-UP

I used high temp plastic barbed reducers, couldn't find the ones in the write up. One tip, have an unused water balloon ready for when you remove the lines from the old cooler. one of the lines will keep dripping trans fluid during the entire process. You will know which one it is once it keeps puking fluid, just put the balloon over that one and save yourself a lot of clean up.
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Old 01-08-2013, 06:37 PM
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Well,I asked two local big tranny shops in my area and they both said it's a direct shot to cooler and back...no bypass.
They also never heard of a 6.0 cooler install on a 7.3..
I don't know how these shops stay in business
I did trace the lines,and are direct run from tranny to cooler..all factory that I could see,where would this bypass be?

They also said truck wouldn't throw a code until 125 degrees..
No wonder the fluid was always red until I towed 12,000 lbs. in 100 degree heat for 8 hours with no gauges...(yeah-stupid on my part).

Last year's run was about 98 on average,with red lights-around 212-215 degrees.(after gauges ).open road after about 30 minutes..around 190--ugh!

I know 4r100's aren't great,but on a budget at the same time,maybe one day a super tranny will live under there..lol

Last edited by digger101; 01-08-2013 at 06:51 PM.
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Old 01-09-2013, 03:49 AM
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Quote:
Originally Posted by digger101 View Post
Well,I asked two local big tranny shops in my area and they both said it's a direct shot to cooler and back...no bypass.
They also never heard of a 6.0 cooler install on a 7.3..
I don't know how these shops stay in business
I did trace the lines,and are direct run from tranny to cooler..all factory that I could see,where would this bypass be?

They also said truck wouldn't throw a code until 125 degrees..
No wonder the fluid was always red until I towed 12,000 lbs. in 100 degree heat for 8 hours with no gauges...(yeah-stupid on my part).

Last year's run was about 98 on average,with red lights-around 212-215 degrees.(after gauges ).open road after about 30 minutes..around 190--ugh!

I know 4r100's aren't great,but on a budget at the same time,maybe one day a super tranny will live under there..lol
Unless they work on a lot of older fords it doesn't surprise me they never heard of the 6.0 trans cooler swap.

Here is the 4R100 bypass, this a pressure bypass not a thermostat by the way.



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Old 01-10-2013, 08:39 PM
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Quote:
Originally Posted by rufushusky View Post
Unless they work on a lot of older fords it doesn't surprise me they never heard of the 6.0 trans cooler swap.

Here is the 4R100 bypass, this a pressure bypass not a thermostat by the way.



Cool!
Dumb me up a little..I know engines,but not trannys,fill my small cranium!!!

Can you tell me what I need to know?...always want to learn more!!

Thanks in advance!!
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Old 01-11-2013, 05:53 AM
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Quote:
Originally Posted by digger101 View Post
Cool!
Dumb me up a little..I know engines,but not trannys,fill my small cranium!!!

Can you tell me what I need to know?...always want to learn more!!

Thanks in advance!!
Well, what do you wan to know? I am by no means a trans guru.

As far as the bypass on the 4R100 the theory behind it is that it is a pressure bypass that in the case of a complete blockage in the cooler line and trans pressure exceeds a certain amount the bypass will trip and allow uncool fluid to return the trans and allow the user to limp home instead of a complete destruction of the trans.

The big issue with them is sometimes they get stuck open when there isn't a blockage causing excessive transmission temps. Some trans builders delete them, some don't. Personally I have not touched mine cause in about 300k of driving trucks with 4r100s (between two trucks) I have never had an issue with so if it ain't broke.

The temps you mention seem a bit high so your bypass could be stuck open or there could be other issues. The 6.0 cooler makes a huge difference, with 45* air temps in Boston bumper to bumper traffic and my winter front totally closed my trans never got over 125*.
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