7.3L 4r100 tranny cooling - Ford Powerstroke Diesel Forum
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Old 06-26-2013, 03:28 PM
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7.3L 4r100 tranny cooling

Alright, I know the 4r100 is crap. but the 7.3 is great. my tranny is running into the 190 area unloaded on a hot day. Just had tranny rebuilt and is still getting hot. 1. should I just go ahead and buy a 6.0 cooler? or 2. should I buy this

BD-Power Xtruded Auxiliary Trans Cooler 1300601-5.5
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Old 06-26-2013, 05:30 PM
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I bought this cooler, http://www.summitracing.com/parts/der-13504/overview/
And this pan, http://www.summitracing.com/parts/der-14208/overview/
I rarely see over 150 unloaded, and have hit 185 once while heavy towing in traffic. This is all in 95 plus temps high humidity. Also I installed the cooler inline with the old cooler.
Hope this helps.
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Old 06-26-2013, 08:38 PM
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look into doing the bypass valve delete really helps with cooling on these trannys to. buddy did that along with 6.0l cooler and rarely sees 190 pulling his 15k hauler around
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Old 06-27-2013, 03:52 AM
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How much more fluid did the pan and cooler add to a stock setup?
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Old 06-28-2013, 03:59 AM
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http://www.dieselsite.com/specialord...ioncooler.aspx

Proven set up. Been over 150* with a 9k load only a few times but never seen over 170 and that is usually on mountain roads where I'm doing 30 MPH with hardly any air flow.

Last edited by merc123; 06-28-2013 at 04:07 AM.
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Old 06-28-2013, 05:44 PM
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Thanks guys. I went ahead a put a 6.0 cooler on and it dropped around thirty degrees. I really like the bigger tranny pan, going to pick one up soon. Thanks
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Old 06-28-2013, 07:53 PM
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Pan added about a gallon of capacity, when I filled mine up it took a little over 4 gallons. Keep in mind I added pan, cooler and dieselsite filter system at same time, but did not change torque converter fluid. Hope this all helps as it has helped mine tremendously without breaking my wallet.
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Old 06-30-2013, 05:43 PM
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I was wondering if a feller could put bigger transmission lines from the trans to the cooler. That should help to? I know the stock lines on the 4r100 are really small, maybe quarter inch or so. Maybe enlarge them to half inch or five eights. What do you all think?
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Old 06-30-2013, 05:56 PM
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What were you doing making your trans get to 190*F?
I run about 150*F-165*F unloaded hwy cruising, and about 185*F with a 9k lb fifth wheel.
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Old 06-30-2013, 06:43 PM
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mine runs 180+ unloaded normal driving with 85% highway. i have a 6.0 cooler and just did a new oem bypass tube. fluid was flushed 30k ago and temps have been this way ever since I have owned the truck. what few times I tow, it gets into the 220+ range. any ideas?
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