Tranny cooler - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 31 Old 07-22-2009, 09:25 AM Thread Starter
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Tranny cooler

I plan on towing a tent trailer with a dry weight of 1400 lbs with my '07 unlimited auto with 4.10 gearing and 33' tires, do I need an extra transmission cooler? Your info will be appreciated.
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post #2 of 31 Old 07-22-2009, 09:40 AM
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Without knowing your tranny temps you won't know for sure, but there's a good chance you will. An additional tranny cooler is not a bad idea anyway.

Here's what i did:

https://www.jkowners.com/forum/showthread.php?t=2458
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post #3 of 31 Old 07-22-2009, 01:34 PM
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Yes, add a cooler
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post #4 of 31 Old 07-22-2009, 02:19 PM
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Adding a transmission cooler is pretty much never a bad idea (as long as it's installed properly, of course!). Transmission temp is the singular most crucial factor in longevity of a transmission. Just remember to tell your service manager at trans flush/service time, or they may under-fill the trans, as the cooler WILL increase capacity- Mark W.

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post #5 of 31 Old 07-22-2009, 02:46 PM
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I believe Bond at Outlaw has a JK tranny cooler kit that he sells.


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post #6 of 31 Old 07-22-2009, 03:08 PM
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This is the one I got:

http://www.summitracing.com/parts/BMM-70264/

I recommend getting an aftermarket cooler whether you tow or not. The factory cooler doesn't seem to cut it wheelin on warm days.

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post #7 of 31 Old 07-22-2009, 07:26 PM
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Ogie,

When you say it won't cut it on warm days, what did you mean? Did you have a gauge on it? I also have a pop-up camper and I am a little concerned about Trans temps.
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post #8 of 31 Old 07-22-2009, 08:47 PM
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I pretty much went all out on my war on overheated transmissions and installed this one. http://www.amazon.com/70297-Hi-Tek-C...8317013&sr=1-8 My transmission rarely goes over 160 now. If you're towing, I'd recommend you take a long look at this one. It's a very tight fit, but it will go in there.

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post #9 of 31 Old 07-23-2009, 07:34 AM
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Quote:
Originally Posted by seer View Post
I pretty much went all out on my war on overheated transmissions and installed this one. http://www.amazon.com/70297-Hi-Tek-C...8317013&sr=1-8 My transmission rarely goes over 160 now. If you're towing, I'd recommend you take a long look at this one. It's a very tight fit, but it will go in there.
I would like to see a picture of this one mounted if you have one.

Carl

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post #10 of 31 Old 07-23-2009, 08:39 AM
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FWIW Running a B&M 70268 I've yet to break 165F even when crawling off-road in 110F heat.

On the highway it sits around 115-125F, in stop and go traffic it gets up to 140F or so. This is in 90-100F heat. I rarely tow, but I am pushing 40's around, so the tranny is working.
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post #11 of 31 Old 07-23-2009, 11:01 AM
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post #12 of 31 Old 07-23-2009, 11:05 AM
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I like that aux. pusher fan set-up, but I'm not a big fan of the tube/fin style coolers.

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post #13 of 31 Old 07-23-2009, 11:45 AM
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Outlaw Offroad just put a tranny cooler on my JK since they'd already be working in that area installing my winch.


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post #14 of 31 Old 07-23-2009, 11:50 AM
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Quote:
Originally Posted by FUN LS1 View Post
Outlaw Offroad just put a tranny cooler on my JK since they'd already be working in that area installing my winch.
Aren't you doing anything yourself? Winches and coolers are easy peazy to install and that's where you could save some money for other stuff.

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post #15 of 31 Old 07-23-2009, 06:10 PM
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Quote:
Originally Posted by kerryp View Post


I didn't see any pusher fans when I was looking for a cooler.

Are there any other options than the tube/ fin, or heat sink? I'll tell you from experience that the heat sink works fine on the pavement but sucks in a majorly hot way on the trail. Plus the tube/fin allows you to put a fan there.

I was in a "Mission Focus" mood and couldn't stop myself long enough to take picts. Here are some from [email protected]'s install:

And here's mine all buttoned up. I had to carve a little bit from the inside of the grill to put it back together, but it doesn't show at all.

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post #16 of 31 Old 07-23-2009, 06:18 PM
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Quote:
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Are there any other options than the tube/ fin, or heat sink?
Plate design coolers, like the B&M I used, are generally more efficient than tube/fin designs.
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post #17 of 31 Old 07-23-2009, 06:27 PM
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Quote:
Originally Posted by PhilD View Post
Plate design coolers, like the B&M I used, are generally more efficient than tube/fin designs.
So much to learn! How does the plate design work?

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post #18 of 31 Old 07-23-2009, 06:52 PM
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Phil D

I have seen your setup on other JK's and it seems to work well. What did you use for gauge and sending unit? Just anything aftermarket. Does anyone know if there is a factory access point on the tranny to get a sending unit in there?
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post #19 of 31 Old 07-23-2009, 06:52 PM
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A plate design uses stacked plates with a opening inside them for the fluid to flow through, usually through multiple paths. They are generally more efficient than tube and fin coolers and good ones have a low pressure drop. They are also very strong. Mine also bypasses some fluid when it's cold.

There are also fin and plate designs.
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post #20 of 31 Old 07-23-2009, 06:58 PM
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Quote:
Originally Posted by Jimmy2x View Post
I have seen your setup on other JK's and it seems to work well. What did you use for gauge and sending unit? Just anything aftermarket. Does anyone know if there is a factory access point on the tranny to get a sending unit in there?
I originally used an inline B&M sender unit and B&M gauge, but switched to a sender in the pan and an Autometer gauge.

Generally speaking inline senders are more responsive and show spikes, whereas pan senders tend not to show spikes as much and give a more "average" reading.

Using an inline sender unit is much easier to install.

For the pan sender unit, my first attempt failed. I drilled and tapped a 1/8" NPT hole in it, but as the sheet metal is so thin the sender unit just stripped the threads out of it, so I added a 1/8" brass nut to the inside, which was much better and works well.

https://www.jkowners.com/forum/showthread.php?t=3784
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post #21 of 31 Old 07-23-2009, 07:45 PM
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Or you can spend the extra $$$ and get an Aeroforce Interceptor gauge. http://www.aeroforcetech.com/products_interceptor.htmlThat just plugs into the OBD port and displays the same temperature the computer is getting.

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post #22 of 31 Old 08-06-2009, 08:18 AM
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Quote:
Originally Posted by seer View Post
Or you can spend the extra $$$ and get an Aeroforce Interceptor gauge. http://www.aeroforcetech.com/products_interceptor.htmlThat just plugs into the OBD port and displays the same temperature the computer is getting.
Has anyone tried these gauges? Are they as simple as they sound to use?
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post #23 of 31 Old 08-06-2009, 09:56 AM
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The couple of people I've seen with them seem to be very happy.
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post #24 of 31 Old 08-06-2009, 01:16 PM
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I have an Aeroforce Interceptor and I like it.


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post #25 of 31 Old 08-06-2009, 02:56 PM
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Does the addition of an aftermarket cooler also help cool the engine because the trans heat is not put into the radiator?

OR, is the cooler put into the return line where some of the heat is already put into the radiator?

AND will the engine run hotter because the trans cooler is sitting in front of the radiator preheating the radiator cooling air?

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