Transmission cooler

[Snackslinger]

I'm running a 347 and a 4r70w built by monster transmission. Do I hav Erin run a transmission cooler? If so what kind and where should I mount it?

 

[sanndmann3]

What kind of driving do you do? Street only or offroad? Does your radiator have a trans cooler in it and is it hooked up? Might be a good idea to get a temp gage with sender in the pan to check temp.
I do lots of high rpm sand duning and trans temps definitely monitored.

 

[spap]

Yes as big as you can fit plate and fin are the best
And in direct airflow

 

[FordBronc]

And best put an inline trans filter to work with the cooler.

 

[904Bronco]

4R70W trans from an Explorer have 3/8" cooler lines and most Rad coolers are set up for 5/16", so yeah an Aux cooler is recommended.

 

[Yeller]

This has been my go to trans cooler for several years. It's the same size as the cooler for a 5r100, never have trans heating issues and I'm pretty hard on them.

https://www.amazon.com/your-orders/pop?ref=ppx_yo2_mob_b_pop__np_5_pp&orderId=114-0336053-3275445&lineItemId=mpjpntjrtrkouny&shipmentId=UHXJyjYZP&packageId=1&asin=B09C7HWKPL

 

[toddz69]

This has been my go to trans cooler for several years. It's the same size as the cooler for a 5r100, never have trans heating issues and I'm pretty hard on them.

https://www.amazon.com/your-orders/pop?ref=ppx_yo2_mob_b_pop__np_5_pp&orderId=114-0336053-3275445&lineItemId=mpjpntjrtrkouny&shipmentId=UHXJyjYZP&packageId=1&asin=B09C7HWKPL

That link takes me to "My Orders" page - maybe a better link?

Thanks,
Todd Z.

 

[Rustytruck]

this is what I use alone without the in radiator cooler. it is important for the tire and gearing be proper so you don't overload the torque converter and produce excessive heat load. My truck has 4.11 gearing and pretty muck 4wd low when offroad.

https://www.summitracing.com/parts/...I9F0EDfEtqsxovlSwm3wCThoC6NsQAvD_BwE#overview

 

[Yeller]

That link takes me to "My Orders" page - maybe a better link?

Thanks,
Todd Z.

Oopps thought I went far enough to get away from that.


https://www.amazon.com/D1M-LPD47391-Pressure-Transmission-Cooler/dp/B09HBHNDB9/ref=mp_s_a_1_1_sspa?crid=J7CP1LCJ0TLC&keywords=transmission+cooler&qid=1637604608&sprefix=transmission+cooler%2Caps%2C169&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzRjJUMFc3N1VHUlZMJmVuY3J5cHRlZElkPUEwOTkwMzQ3MTRYTENaQkQ3WEhVWSZlbmNyeXB0ZWRBZElkPUEwMjA3NDU1Mk9OWEVKODg4MkhNWiZ3aWRnZXROYW1lPXNwX3Bob25lX3NlYXJjaF9hdGYmYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl

 

[toddz69]

Oopps thought I went far enough to get away from that.


https://www.amazon.com/D1M-LPD47391-Pressure-Transmission-Cooler/dp/B09HBHNDB9/ref=mp_s_a_1_1_sspa?crid=J7CP1LCJ0TLC&keywords=transmission+cooler&qid=1637604608&sprefix=transmission+cooler%2Caps%2C169&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzRjJUMFc3N1VHUlZMJmVuY3J5cHRlZElkPUEwOTkwMzQ3MTRYTENaQkQ3WEhVWSZlbmNyeXB0ZWRBZElkPUEwMjA3NDU1Mk9OWEVKODg4MkhNWiZ3aWRnZXROYW1lPXNwX3Bob25lX3NlYXJjaF9hdGYmYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl

Those are good coolers - a variation on the early Super Duty coolers. I've run one of those in conjunction with a B&M cooler about the size of the one Rustytruck posted and felt like it still wasn't enough in some situations.

Todd Z.

 

[Snackslinger]

Is the built in coolers sufficient? I have to get a radiator anyway.

 

[Rustytruck]

sufficient if the truck is stock but once you start changing things like bigger tires without gearing change, towing anything offroad in high range 4wd anything the effects performance can be detrimental to transmission cooling. the stock system was good for a totally stock truck but you had to watch tranny fluid and change it as soon as you saw any color change. for the most part the radiator was just enough to keep the truck cool enough. stock tyranny lasted about 10 years or so before needing rebuilt. Mine is over 30 years now since its last going through. I worry about it but it hasn't failed me or any signs of failure yet. but my tranny doesnt go over 160 F since being divorced from the radiator cooler.

 

[SSDDBRONCO]

Since we are on this topic, what is the normal operating temperature of a 4r70w?

 

[Broncobowsher]

Is the built in coolers sufficient? I have to get a radiator anyway.

They are great and please use it. There are many benefits that often get overlooked. The water is a great heat sink. When you make a spike of heat, running hard against the convertor at little to no speed, it will take the heat and dump into the engine coolant. Sure it will spike the water temp a little, but little compared to what it is taking out of the trans fluid. And most people will see that water temp rise a few degrees and know they are making heat.

But just about every new vehicle I can think of in the past 20ish years has 2 coolers. An oil to air cooler which works great at pulling heat out of the transmission while you have airflow and are not dumping that heat into the coolant. The in radiator as the low speed safety net to catch heat the oil to air can't shed due to severe heat generation and/or low airflow.

The more you are making power and putting that power into the torque convertor while it is in the multiply phase, the more heat you need to get rid of. The heat will eventually go to the air, but at times you just don't have the airflow to support it.

As for how hot to run it. There are a lot of opinions, charts posted on the internet (often by transmission cooler companies to sell there product) that get repeated again and again, often loosing the source of the information. If you can run 150, that's a cool transmission. 170 is fine as well. 200s for spike loads, just not sustained. That is it is OK for a few moments, but not cruising down the road. 190 is typically warmer than you should run, but I would accept on a 110° pulling up the side of a mountain.