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Discussion Starter #1
I need to improve my trans cooling. I have a gauge in the test port and watch it regularly. I don't mind pulling over on long climbs now and then, but i've been towing on a lot of slow dirt roads and driving with the TC slipping gets hot *really* fast, even on level ground.

Plenty of options out there for a trans cooler but I don't see many with a fan. I was thinking an electric fan would be good since my biggest concern is with low-speed driving.

Will the sheer size of an upgraded cooler be adequate even at low speed, or should I keep hunting for a fan?

This thread talks about using an electric cooler for slow-speed driving, and kinda makes it sound unnecessary, but isn't totally clear on that.

Is there space to replace the factory air-to-oil cooler with the Mishimoto plate cooler, and then put a fan in front of it?
 

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I had a B&M fluid cooler with a fan, it wasn’t enough. I ended up changing to a 6.0 cooler. I wished I had not wasted my money on the B&M. The 6.0 coolers work very well. There is a reason why everyone upgrades to them.


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Project Shamu
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Just be sure to mount it somewhere in front of the Ac-condenser and the engine fan will pull air through it for you.

I've pulled 13,000lbs through the mountains and never seen trans temp over 180*. And mine is mounted behind the bumper.
 

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Discussion Starter #5
Just be sure to mount it somewhere in front of the Ac-condenser and the engine fan will pull air through it for you.

I've pulled 13,000lbs through the mountains and never seen trans temp over 180*. And mine is mounted behind the bumper.
If it were just mountain highways, I'd already have ordered the 6.0 cooler. Even pulling a steep pass, the engine is working so hard that the fan is running and the truck is making headway at least 30mph even if the fan isn't turning. But after just a couple miles of dead level, flat, bumpy dirt roads at 15 mph in near-freezing temps, my trans is breaking 200*. Understand that by "bumpy" i don't just mean "gravel road", i mean rocks and stuff. I'm keeping the speed low to avoid tossing everything in the truck and trailer, so it isn't moving forward fast enough to move much air thru the radiator and the fan clutch isn't locking so there's very little cooling going on.

What about a deeper pan? Does that do anything except look cool and snag on rocks (no lift kit on my truck)?
 

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Project Shamu
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The deeper pan is a common debate that nobody proves or disproves. I personally dont run one.

If your worried about airflow at lower speeds, maybe a 6.0 fan with a new fan clutch? It helped me immensely.

I just dont like too many fans, especially if at high speed they are going to restrict airflow and cause problems then.
 

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I just put a Hayden 679 on mine in the front grill and really didn't see that much of a difference maybe 6 or 7 degrees lower. I to wish I had just put the money on a 6.0 cooler.

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The deeper pan is a common debate that nobody proves or disproves. I personally dont run one.

If your worried about airflow at lower speeds, maybe a 6.0 fan with a new fan clutch? It helped me immensely.

I just dont like too many fans, especially if at high speed they are going to restrict airflow and cause problems then.


You could add your own fan to a 6.0 cooler. I have bulled 6000lb on slow dirt roads in the mountains of Colorado and don’t see over 175 temps on my truck with a 6.0 cooler.


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If it were just mountain highways, I'd already have ordered the 6.0 cooler. Even pulling a steep pass, the engine is working so hard that the fan is running and the truck is making headway at least 30mph even if the fan isn't turning. But after just a couple miles of dead level, flat, bumpy dirt roads at 15 mph in near-freezing temps, my trans is breaking 200*. Understand that by "bumpy" i don't just mean "gravel road", i mean rocks and stuff. I'm keeping the speed low to avoid tossing everything in the truck and trailer, so it isn't moving forward fast enough to move much air thru the radiator and the fan clutch isn't locking so there's very little cooling going on.

What about a deeper pan? Does that do anything except look cool and snag on rocks (no lift kit on my truck)?
200° trans fluid is not an issue but to lower fluid temp, you need to replace your stock OTA cooler with a 6.0 OTA cooler. The OE cooling fan on your truck will move more air when unlocked than an electric fan will move.

If that doesn't solve your cooling issue, the next step is to replace your radiator with a later model radiator that has an OTW cooler in it. Then you run your fluid in a series thru the OTW and the OTA cooler.

A deeper pan will not be any help.
 

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Just out of curiosity, when you're crawling around slow over rough stuff, are you pulling the shifter down to 1st gear?

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Discussion Starter #11
200° trans fluid is not an issue but to lower fluid temp, you need to replace your stock OTA cooler with a 6.0 OTA cooler. The OE cooling fan on your truck will move more air when unlocked than an electric fan will move.

If that doesn't solve your cooling issue, the next step is to replace your radiator with a later model radiator that has an OTW cooler in it. Then you run your fluid in a series thru the OTW and the OTA cooler.

A deeper pan will not be any help.
200* was in cold temps; it'll go much higher in warm. Last week I forgot to watch my trans gauge on a road which started off fast-n-easy and then turned rough. When I finally remembered to glance at it, the temp had hit 280 (!!!!) and was on its way to the moon. Stopped immediately of course and idled but this tranny only has 25k on it and I want it to last, so don't need to repeat this mistake. Soon as I got back to town I put in Lubeguard and at my next break I'm going to flush the trans and add cooler & magnefine. I hope I didn't do too much damage. I also considered putting on an Insight monitor since I could set an alarm for trans temp...but I already have AutoEnginuity so I think it makes more sense to put the same money into a fix, rather than an expensive idiot light that mostly duplicates what I've already paid for in AE. Shoulda just got the Insight in the first place, I guess.

Thanks everybody for the feedback, especially the real-world results of using the 6.0 cooler at low speeds. That makes me feel much better about going that route, which is definitely my preference since it sounds like a straightforward and fair-priced mod. I am not in the mood for fussy, expensive mods right now : ) I will try to remember and update this thread afterwards.

When the radiator eventually needs replacing I'll definitely find one with OTW but I don't want to do that without trying the 6.0 cooler on its own, first. Especially since I just did a full coolant flush last month.
 

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I have a 97 f350 with an IC, 238 80 injectors, etc. and I used to run a small trans cooler with an electric fan but it would still get pretty warm. I switched to a 6.0 cooler and the 6.0 plastic fan last spring (double check for clearance if you do so) and it made a world of difference on mine.. I will still get ~210-220 on LONG pulls but if you are on the dirt I would use 4-low if possible.. I have considered putting manual locking hubs in for this very purpose.. Our summer days are well over 100* and my trailer is ~16K lbs...
 

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Just be sure to mount it somewhere in front of the Ac-condenser and the engine fan will pull air through it for you.

I've pulled 13,000lbs through the mountains and never seen trans temp over 180*. And mine is mounted behind the bumper.
Huh, on a long grade pull on a 85-90 deg day i see 200-215 on the trans. I have an 08 F450 w factory cooler and use synthetic fluid. 180 would be great....not sure how you do that

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I have a very similar setup as Joshz. I did the 6.0 TC only (still have stock clutch fan) My temps are generally 160-175 even pulling my 13K Toyhauler only see 190's on grades. Also without a load my truck hardly ever sees 155deg.

Trans fluid begins to break down above 175, at 200 the affect on your fluid/transmission is minimal to the life of your transmission, however as temps increase the affects scale up (see "www".txchange.com/heatchrt.htm)

The key on trans coolers is volume along with cooling surface area. A pan will provide more volume but without additional cooling surface area your temps can still exceed optimal.

In-radiator coolers are NOT a good solution (especially for tow vehicles) and are actually counter productive. Your radiator coolant cooling system runs at approx 195 in Diesel trucks and up to 220 in gas vehicles, so trying to "cool" your trans fluid running it through your in-radiator "cooler" only heats up your trans fluid. Tow packages include an external cooler which is suppose to bring trans fluid temp down however, tow package coolers are generally undersized and suitable for light loads. If the internal radiator trans cooler is included in the system the fluid is still being heated before the external cooler can try to bring the temp down.

Solution is bypass the in-radiator trans "cooler" and only use an external trans cooler.

Here's another link to help in sizing your external trans cooler "www".hotrod.com/articles/transmission-cooler-basics

So, I'm curious if Joshz still has his in-radiator trans cooler in his system? This might explain why my temps on a similar setup seems to run about 10-15deg cooler.

Mike

btw: former AAMCO Transmission shop owner

NOte: sorry I don't have enough posts to include links in my posts please remove "" from addresses....:wink:
 

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200* was in cold temps; it'll go much higher in warm. Last week I forgot to watch my trans gauge on a road which started off fast-n-easy and then turned rough. When I finally remembered to glance at it, the temp had hit 280 (!!!!) and was on its way to the moon. Stopped immediately of course and idled but this tranny only has 25k on it and I want it to last, so don't need to repeat this mistake. Soon as I got back to town I put in Lubeguard and at my next break I'm going to flush the trans and add cooler & magnefine. I hope I didn't do too much damage. I also considered putting on an Insight monitor since I could set an alarm for trans temp...but I already have AutoEnginuity so I think it makes more sense to put the same money into a fix, rather than an expensive idiot light that mostly duplicates what I've already paid for in AE. Shoulda just got the Insight in the first place, I guess.

Thanks everybody for the feedback, especially the real-world results of using the 6.0 cooler at low speeds. That makes me feel much better about going that route, which is definitely my preference since it sounds like a straightforward and fair-priced mod. I am not in the mood for fussy, expensive mods right now : ) I will try to remember and update this thread afterwards.

When the radiator eventually needs replacing I'll definitely find one with OTW but I don't want to do that without trying the 6.0 cooler on its own, first. Especially since I just did a full coolant flush last month.
You should also check your cooler bypass valve to make sure it is working correctly.
 

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There was a guy on some of these Ford forums that was an engineer and was involved in the developement of the 5r110 tranny and i think he had said once that the trans can take the heat for short duration...apparently tested up into the 300 deg range w no issues. I would flat out have a strome if mine got past 240 or so, as mine is a built trans new about 2 yrs ago....i watch it closely when towing along w the EOT

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There was a guy on some of these Ford forums that was an engineer and was involved in the developement of the 5r110 tranny and i think he had said once that the trans can take the heat for short duration...apparently tested up into the 300 deg range w no issues. I would flat out have a strome if mine got past 240 or so, as mine is a built trans new about 2 yrs ago....i watch it closely when towing along w the EOT

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That was "stroke" not strome....lol

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I hit 280 degrees once pulling my 5ver and I said no more of that. Bought the 6.0 cooler and have never seen 180 again. Yes, I hardlly ever get hot. It was the best purchase I have ever made for my 02 7.3. last year when it was 100 outside and it was really smokey is when I hit 186 on the uphills. But other than that I run on average about 140-150 on the tranny. After I rebuilt it and added the deep pan with holes in it to cool better, I run as low as 135. No fans just the 6.0 cooler. Now I run 28qts of tranny fluid and it seems to help it stay cool.
 

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Just be sure to mount it somewhere in front of the Ac-condenser and the engine fan will pull air through it for you.

I've pulled 13,000lbs through the mountains and never seen trans temp over 180*. And mine is mounted behind the bumper.
Huh, on a long grade pull on a 85-90 deg day i see 200-215 on the trans. I have an 08 F450 w factory cooler and use synthetic fluid. 180 would be great....not sure how you do that

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I bought the TruCool trans cooler from Dieselsite when I bought my trans, as well as an external trans filter, upgraded to all 3/8" lines and deleted the bypass tube. So better flow, better cooling and better filtration.
 

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There was a guy on some of these Ford forums that was an engineer and was involved in the developement of the 5r110 tranny
Yes, there is.

The trans can go as high as 220°F all day long with NO problems. You can go as high as 250°F for no more than a half hour at a time. If it gets above 250°F put it in neutral or park and idle or fast idle to cool the trans. DO NOT SHUT IT OFF HOT! That will trap the heat inside the trans and cook it.

These temperatures are measured at the test port or the factory sensor inside the trans. If you are measuring the temperatures in the pan you'll have to come up with your own limits. The pan is often cooler than the other measuring places. If you are measuring the temperature in the line to the cooler, you will see MUCH hotter temperatures. I've seen over 300°F while the factory sensor and the test port were still below 250°F.
 
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