DIY: 7AT Transmission Cooler

Wonka2581 · 09-08-2013, 11:44 PM

I jusy finnished installing my STILLEN Transmission cooler this DIY is for all the 7AT guys and girls, so far I have noticed the transmission feels the same but with one diffrence, when I beat on the car on a hot day the transmission feels like it shifts easier with a little less lag time. But the benefits of having the cooler are extending the life of your transmission! I used the stillen kit, I ran the kit in line with the stock cooler thats already on the car (dual coolers on the transmission) With out further adieu

1) remove the front bumper

2) locate the stock transmission cooler lines they are on the drivers side right behind the radiator.

3) disconnect one of the lines you will lose some fluid I used a line clamp to prevent any axcess fluid loss.

4) mount your transmission cooler i chose to mount it to the aluminum bar/bumper

5) Connect one of the lines from the new cooler to the line you disconnected on the transmission.
(NOTE) WSTAR stated that stillen shipps the cooler kit with 3/8" hose and the car has 5/16" lines, If you look at the hard lines coming off the transmission they are 3/8" that taper down to 5/16" just slide the new hose a little higher up on the hard line and clamp it.

6) Run the other line from the new cooler to the line coming from the stock cooler attach it with a F to F barb.

7) start the car and check for leaks.

I chose to mount the cooler upside down (it was my choice) therefore I could not fill the cooler, And with Nissan and their infinite wisdom you cannot add any fluid to the transmision your self, I went to the dealer and had them top off the transmission fluid.

Wonka2581 · 09-08-2013, 11:47 PM

Stock lines

Mounted cooler

F to F barb

My shop behind the house.

DEpointfive0 · 09-09-2013, 12:07 AM

Why did you mount it top down?
How will you know the fluid level will remain at the correct level?

And are you SURE the lines start at 3/8" and go to 5/16"? The GTR tech working on my car showede the line and it said "Transmission 5/16""
Also, tubing that tapers isn't exactly easy to find

Wonka2581 · 09-09-2013, 12:16 AM

Quote:

Originally Posted by DEpointfive0

Why did you mount it top down?
How will you know the fluid level will remain at the correct level?

And are you SURE the lines start at 3/8" and go to 5/16"? The GTR tech working on my car showede the line and it said "Transmission 5/16""
Also, tubing that tapers isn't exactly easy to find

It was the location I chose, The transmission is sealed what do you mean correct level? The taper is very easy to find approx 2 inches up on the hard line.

EZT · 09-09-2013, 08:44 PM

Just finished this recently myself, but did not mount it up side down. Also, I took it in and had the dealer flush and refill the transmission along with the additional amount for the cooler.

Wonka2581 · 09-09-2013, 09:11 PM

Does anyone know where to purchase the filler attachment?

Joker_J · 03-25-2016, 07:44 AM

I bought a trans cooler as well, is there any difference in the feel or anything after you installed it??

Wonka2581 · 03-25-2016, 12:56 PM

Quote:

Originally Posted by Joker_J

I bought a trans cooler as well, is there any difference in the feel or anything after you installed it??

No, you will not notice it. But our transmission will last longer. Heat is what destroys the 7AT.

Mulli007 · 08-04-2016, 05:36 PM

What size F to F barb did you use? Edit: Googled 5/16 to 3/8 hose barb.

Have you run into any issues with running the inline setup?

Wonka2581 · 08-06-2016, 03:06 PM

Quote:

Originally Posted by Mulli007

What size F to F barb did you use? Edit: Googled 5/16 to 3/8 hose barb.

Have you run into any issues with running the inline setup?

None! no issues what so ever!! Still running strong...

hustleman222 · 01-02-2017, 02:23 AM

I'm thinking about doing this also...thanks for the help.

Kris9884 · 01-13-2017, 01:15 PM

Any pictures of how you ran the lines?

Eagle · 01-13-2017, 01:23 PM

Quote:

Originally Posted by Kris9884

Any pictures of how you ran the lines?

Unfortunately I didn't take many pics, only got a couple shots of the cooler and the connection to the transmission hard line.

I mounted my trans cooler on the passenger side and I ran my lines to the drivers side, one line connected to the rubber hose coming off of the radiator, the other line hooked up to the hard line coming off the transmission.

Wonka2581 · 01-13-2017, 01:34 PM

Quote:

Originally Posted by Eagle

Unfortunately I didn't take many pics, only got a couple shots of the cooler and the connection to the transmission hard line.

I mounted my trans cooler on the passenger side and I ran my lines to the drivers side, one line connected to the rubber hose coming off of the radiator, the other line hooked up to the hard line coming off the transmission.

MarkGideon · 04-21-2019, 08:46 AM

Quote:

Originally Posted by Wonka2581

Does anyone know where to purchase the filler attachment?

Just in case anyone else needs this info, I got the "CTA Tools 7425 ATF Filler Adapter for Infiniti 7 Speed" from Amazon and it worked perfectly.

09-08-2013, 11:44 PM	#1 (permalink)
Wonka2581 A True Z Fanatic Join Date: Nov 2012 Location: Chattanooga, TN Posts: 3,083 Drives: MY WIFE CRAZY.... Rep Power: 2611	DIY: 7AT Transmission Cooler I jusy finnished installing my STILLEN Transmission cooler this DIY is for all the 7AT guys and girls, so far I have noticed the transmission feels the same but with one diffrence, when I beat on the car on a hot day the transmission feels like it shifts easier with a little less lag time. But the benefits of having the cooler are extending the life of your transmission! I used the stillen kit, I ran the kit in line with the stock cooler thats already on the car (dual coolers on the transmission) With out further adieu 1) remove the front bumper 2) locate the stock transmission cooler lines they are on the drivers side right behind the radiator. 3) disconnect one of the lines you will lose some fluid I used a line clamp to prevent any axcess fluid loss. 4) mount your transmission cooler i chose to mount it to the aluminum bar/bumper 5) Connect one of the lines from the new cooler to the line you disconnected on the transmission. (NOTE) WSTAR stated that stillen shipps the cooler kit with 3/8" hose and the car has 5/16" lines, If you look at the hard lines coming off the transmission they are 3/8" that taper down to 5/16" just slide the new hose a little higher up on the hard line and clamp it. 6) Run the other line from the new cooler to the line coming from the stock cooler attach it with a F to F barb. 7) start the car and check for leaks. I chose to mount the cooler upside down (it was my choice) therefore I could not fill the cooler, And with Nissan and their infinite wisdom you cannot add any fluid to the transmision your self, I went to the dealer and had them top off the transmission fluid. Eagle, hus200 and Zingston like this. __________________ "I have nothing to offer but blood, toil, tears and sweat""Winston Churchill"

09-08-2013, 11:47 PM	#2 (permalink)
Wonka2581 A True Z Fanatic Join Date: Nov 2012 Location: Chattanooga, TN Posts: 3,083 Drives: MY WIFE CRAZY.... Rep Power: 2611	Stock lines Mounted cooler F to F barb My shop behind the house. labrador likes this. __________________ "I have nothing to offer but blood, toil, tears and sweat""Winston Churchill"

09-09-2013, 12:07 AM	#3 (permalink)
DEpointfive0 Premium Member Bitches Join Date: Jan 2012 Location: SoCal Posts: 14,824 Drives: a lot Rep Power: 17151	Why did you mount it top down? How will you know the fluid level will remain at the correct level? And are you SURE the lines start at 3/8" and go to 5/16"? The GTR tech working on my car showede the line and it said "Transmission 5/16"" Also, tubing that tapers isn't exactly easy to find __________________ Do YOU want to know what/where I got my username from? ( Click to show/hide ) NSFW due to language:

09-09-2013, 08:44 PM	#5 (permalink)
EZT Track Member Join Date: Mar 2011 Location: Gainesville Posts: 535 Drives: 09 370z Rep Power: 315	Just finished this recently myself, but did not mount it up side down. Also, I took it in and had the dealer flush and refill the transmission along with the additional amount for the cooler. Nut_N_Much likes this.

09-09-2013, 09:11 PM	#6 (permalink)
Wonka2581 A True Z Fanatic Join Date: Nov 2012 Location: Chattanooga, TN Posts: 3,083 Drives: MY WIFE CRAZY.... Rep Power: 2611	Does anyone know where to purchase the filler attachment? __________________ "I have nothing to offer but blood, toil, tears and sweat""Winston Churchill"

03-25-2016, 07:44 AM	#7 (permalink)
Joker_J Track Member Join Date: Aug 2014 Location: The Ville, KY Posts: 576 Drives: 2014 NISSAN 370Z Rep Power: 12	I bought a trans cooler as well, is there any difference in the feel or anything after you installed it??

08-04-2016, 05:36 PM	#9 (permalink)
Mulli007 Base Member Join Date: Mar 2015 Location: houston, tx Posts: 8 Drives: not a Z :( Rep Power: 10	What size F to F barb did you use? Edit: Googled 5/16 to 3/8 hose barb. Have you run into any issues with running the inline setup? Last edited by Mulli007; 08-04-2016 at 05:47 PM. Reason: Answered my own question.

01-02-2017, 02:23 AM	#11 (permalink)
hustleman222 Enthusiast Member Join Date: Sep 2014 Location: Louisiana Age: 39 Posts: 250 Drives: 15 Nissan 370Z Nismo Rep Power: 3365	I'm thinking about doing this also...thanks for the help. Wonka2581 likes this. __________________ 316whp/262tq 12.38 @ 110mph on 3.91 gears 336whp/273tq Didn't push it hard enough. Turbo Time

01-13-2017, 01:15 PM	#12 (permalink)
Kris9884 Base Member Join Date: Mar 2016 Location: MO Posts: 72 Drives: 2008 G37s Rep Power: 9	Any pictures of how you ran the lines? __________________ My slow build thread on MyG37 - http://www.myg37.com/forums/build-th...upe-build.html

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