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Old 06-10-2011, 09:45 PM   #1
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auto trans super cooler mod

ok last year 80,000 wranglers had a recall due to automatic transmission overheating problems,,

im here to help.
this mod is basicaly a radiator for your automatic transmission.

its a flex-a-lite transmission cooler pt#4118.
it has a gvwr(gross vehicle wieght rating) of 18,000lbs,about triple what the wrangler needs.

its made in the good ol' usa and features turbulators,copper tubes and cooling fins.

what you will need.
flex a lite trans cooler pt#4118

2x 3/8-inch fittings with barbed ends on both sides

2x extra clamps

2 pieces of metal stripping approximetly* 1 1/2 ft per piece
and 2 feet of 3/8ths transmission cooler hose

6 12/ 1/2 sheet metal screws


start by letting engine cool,and remove the grill,,its quite easy,,theres 6 2-piece plastic fasteners across the top,use a small flathead to remove the center piece and then the outer piece,,,then there is four clips on the bottom of the grill,,all you have to do is give it a little pull and they will come loose.until you get this.


step1 is taking the metal strapping and making brakets that fit between the upper and lower core support..i used a vice,and a hammer for my bends..until i ended up with this,,(you can make brackets any way you desire)

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Old 06-10-2011, 09:45 PM   #2
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and then you will notice a mounting kit comes with the flex-a-lite cooler,and you want o use that kit to mout the cooler to your brackets and it will end up looking like so..






ok next step again is up to you for positioning,,i had to drill holes in the upper and lower core support for bracket placement,and i did so like this,,,i also added my hoses,,,there is a hose that comes with the cooler,and there is your 2 ft of hose,,the 2ft goes on bottom and the longer one goes on the top,and place your clamps for hose to seal around fitting.





next step is to tie into the existing transmission line..looking through the top of the hood it would be the top line,be sure to put something under line before cutting as a little tranny fluid will leak out..heres pics of cut needed to be made.



now undernieth your jeep is where the 2 lines are,,you'll want to make some cuts to make all lines size up right,, make sure they run clean and free from any sharp edged objects or moving/running parts (mine go right under the radiator)..after you have cut lines to size,install one of the double barbed fittings in each line and clamp them down,,,,

now make sure the fluid comming from the trans goes into the top of the new flex-a-lite cooler and the bottom will splice into the other end,(make sure to put clamps over lines before conecting fittins as they are a s.o.b. to get back off..after all lines are connected it should look like this.


and now just go through and make sure all six clamps are tight and lines are routed the right way...check your trans fluid level,start it up and watch it say thanks....now reinstall your grill and reep the reward



even if your jk wasnt effected by the recall,this mod can extend the life and performance of your automatic transmission..

hope it helps somebody

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Old 06-10-2011, 10:06 PM   #3
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Holy crap Seelye. I don't even have an auto transmission, but I can say that was a good write up.
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Old 06-10-2011, 10:09 PM   #4
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thanks,,,i wouldnt have one either if the wifey didnt want to drive it,,but i had to be the nice guy,so i figured i would boost it up a little bit
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Old 06-11-2011, 05:00 PM   #5
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wow,i thought more people would be interested in this.
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Old 06-11-2011, 05:10 PM   #6
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I did a BCM on my TJ.
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Old 06-11-2011, 08:10 PM   #7
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Excellent writeup! I would suggest some mesh behind the grille to protect the cooler. Tube and fin coolers and rocks, road debris, etc, don't get along.
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Old 06-11-2011, 09:30 PM   #8
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wow,i thought more people would be interested in this.
Looks good to me!

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Old 06-11-2011, 11:16 PM   #9
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Good writeup!
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Old 06-12-2011, 12:47 AM   #10
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I am going to install an auto tran aux cooler (at some point) and have read a few write ups on installs. The other ones I've read recommend the line from the trans into the cooler should go into the bottom of the cooler and not the top. Various reasoning is given but thinking of the engine radiator the flow is from engine into the top of the radiator; same config you have done with your trans cooler.

Would there be some valid reason to route it opposite to what you did or will it not make enough difference either way; more important just to have the thing hooked up?

Thanks.
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Old 06-12-2011, 12:53 AM   #11
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just did the B&M cooler a couple days ago. B&M says it has a cold weather bypass built into the cooler construction. Good if your in a cold climate, gets into the negatives in winter here.
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Old 06-12-2011, 06:52 AM   #12
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awesome,,thanks a lot fellas..

cajalco,,,my thoughts on how the lines run is like a siphon,,therefor if the fluid starts at top,it can be "pushed" down the cooler much easier than being "pulled" up the cooler.
its basicaly just physics.

moneypit,i hear ya,,it's just the opposite here in va beach,,yesterday was 98.
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Old 06-12-2011, 06:54 AM   #13
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Excellent writeup! I would suggest some mesh behind the grille to protect the cooler. Tube and fin coolers and rocks, road debris, etc, don't get along.
been thinking of doing this but i want to make sure i dont restrict airflow at all. any ideas?
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Old 06-12-2011, 06:57 AM   #14
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Originally Posted by Cajalco View Post
I am going to install an auto tran aux cooler (at some point) and have read a few write ups on installs. The other ones I've read recommend the line from the trans into the cooler should go into the bottom of the cooler and not the top. Various reasoning is given but thinking of the engine radiator the flow is from engine into the top of the radiator; same config you have done with your trans cooler.

Would there be some valid reason to route it opposite to what you did or will it not make enough difference either way; more important just to have the thing hooked up?

Thanks.
I would follow whatever routing instructions that come with the specific brand and model of cooler you purchase. For example, the B&M 70268 cooler instructions state to route the line coming into the B&M cooler at the bottom, then out at the top, back to the transmission.

B&M 70268 cooler - click on "download cooler tech doc" on this page

JP Magazine, July, 2011 issue, page 76, installs a Flex-a-Lite #4118 cooler, exactly like the OP. They state the line from the radiator should go into the TOP of the trans cooler, and exit from the bottom, to return to the transmission.

That is the exact opposite of the B&M instructions.

I would just follow whatever instructions that come with the cooler you install.

Mabar
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Old 06-12-2011, 07:01 AM   #15
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been thinking of doing this but i want to make sure i dont restrict airflow at all. any ideas?
Here is my mesh grill mod write-up. I doubt if it restricts much air.

JK Wrangler mesh grill mod

Mabar
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Old 06-12-2011, 07:33 AM   #16
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Is it necessary to make brackets? The threaded connectors looked long enough to go through the radiator and a/c cores and mount flat up against the front core.
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Old 06-12-2011, 09:02 AM   #17
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Here is my mesh grill mod write-up. I doubt if it restricts much air.

JK Wrangler mesh grill mod

Mabar
awesome dude,thank you very much
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Old 06-12-2011, 09:04 AM   #18
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Is it necessary to make brackets? The threaded connectors looked long enough to go through the radiator and a/c cores and mount flat up against the front core.
nope,not necessary at all to make brackets,i only did so,so the cooler wasnt sitting on top of the radiator,but honestly they give you the long connectors so you can do exactly that.
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Old 06-12-2011, 09:15 AM   #19
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awesome dude,thank you very much
Hah! You are welcome! Seemed to work out well for me.

Very nice write-up on the trans cooler install.

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Old 06-12-2011, 10:37 AM   #20
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Hah! You are welcome! Seemed to work out well for me.

Very nice write-up on the trans cooler install.

Mabar
thanks for compliment,,and i just went and picked up everything for the grill guard,i'll be installing later with your instructions,,thanks again!!
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Old 06-12-2011, 11:11 AM   #21
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thanks for compliment,,and i just went and picked up everything for the grill guard,i'll be installing later with your instructions,,thanks again!!
Don't forget the pics when you are done.

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Old 06-12-2011, 11:19 AM   #22
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Nice detailed write up and the pics makes it even better
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Old 06-12-2011, 12:45 PM   #23
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I would follow whatever routing instructions that come with the specific brand and model of cooler you purchase. For example, the B&M 70268 cooler instructions state to route the line coming into the B&M cooler at the bottom, then out at the top, back to the transmission.

B&M 70268 cooler - click on "download cooler tech doc" on this page

JP Magazine, July, 2011 issue, page 76, installs a Flex-a-Lite #4118 cooler, exactly like the OP. They state the line from the radiator should go into the TOP of the trans cooler, and exit from the bottom, to return to the transmission.

That is the exact opposite of the B&M instructions.

I would just follow whatever instructions that come with the cooler you install.

Mabar
nice,,that was my source for doing this also...i figured if they did it in jp it should be a good mod,,and cheap..
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Old 06-12-2011, 12:46 PM   #24
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Nice detailed write up and the pics makes it even better
thanks man,,and i couldnt agree more,,i learn from pics,,a.d.d. makes it a sob to read so pics are worth a million words.
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Old 06-12-2011, 08:45 PM   #25
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Old 06-12-2011, 09:38 PM   #26
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Originally Posted by seelye
ok last year 80,000 wranglers had a recall due to automatic transmission overheating problems,,

im here to help.
this mod is basicaly a radiator for your automatic transmission.

its a flex-a-lite transmission cooler pt#4118.
it has a gvwr(gross vehicle wieght rating) of 18,000lbs,about triple what the wrangler needs.

its made in the good ol' usa and features turbulators,copper tubes and cooling fins.

what you will need.
flex a lite trans cooler pt#4118

2x 3/8-inch fittings with barbed ends on both sides

2x extra clamps

2 pieces of metal stripping approximetly* 1 1/2 ft per piece
and 2 feet of 3/8ths transmission cooler hose

6 12/ 1/2 sheet metal screws

start by letting engine cool,and remove the grill,,its quite easy,,theres 6 2-piece plastic fasteners across the top,use a small flathead to remove the center piece and then the outer piece,,,then there is four clips on the bottom of the grill,,all you have to do is give it a little pull and they will come loose.until you get this.

step1 is taking the metal strapping and making brakets that fit between the upper and lower core support..i used a vice,and a hammer for my bends..until i ended up with this,,(you can make brackets any way you desire)
Excellent! Come do mine, I am incapable
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Old 06-13-2011, 06:11 AM   #27
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where are you located?
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Old 06-13-2011, 06:29 AM   #28
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Great post. Thanks
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Old 06-13-2011, 06:33 AM   #29
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Looks great, Seeyle.

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Old 06-13-2011, 10:14 AM   #30
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Great post. Thanks
welcome

mabar,,thanks man,,it was a super easy "perfect" mod.

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