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Unread 04-11-2006, 11:43 AM   #1
roadhog
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tranny: to cool or not to cool?

I've got a question which I'm sure is simple for many of you out there. I'm trying to decide if and how I should install an auxilliary trans cooler. Here's my situation.

I've got a 2000 Jeep Cherokee Sport, auto trans, 4.0L in-line 6, 58k miles. It does *not* have the factory tow package, just an aftermarket hitch I recently had put on. I've never towed before, but now have a need to tow fairly regularly (pop-up camper). The trailer, even when packed to max gross weight, is only 2300 pounds or so. I know I've got plenty of power, but I'm nervous about long term wear to the tranny. So I'm thinking I should definitely install an auxilliary cooler, for peace of mind if nothing else. Do you agree?

So, assuming you do, I'm curious if this is something I could realistically do myself. I'm not the best wrench when it comes to autos, but I'm also no idiot mechanically, and I do have the time and sort of enjoy "messing around" as long as I don't break stuff. Ironically, I'm a military helicopter pilot and can teach long classes on how the various complex systems on my multi-engine, multi-transmission aircraft work, but I know little about vehicles.

So, would this install be something that is probably "over my head" or is it pretty easy?

Thanks!

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Unread 04-11-2006, 11:52 AM   #2
johnsoninc86
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Overall, this is a really easy modification, and YES i think you should do it. 2300 pounds is no weight to mess around with, especially with an XJ. I would say that if you can change your oil and give it a tune up, you should be able to do this modification without trouble. There are a quite a few writeups out there, go over to jeepin.com, he has a write up on there about his tranny cooler install.
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Unread 04-11-2006, 11:53 AM   #3
law.74
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Tranny coolers are great for any towing and those that wheel in the hotter parts of the world. the instal is really not difficult at all.

BTW, welcome
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Unread 04-11-2006, 11:53 AM   #4
Matt Gertsch
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Dooo eeet. Heat is the only thing that will kill an AW4.
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Last edited by Matt Gertsch; 04-11-2006 at 12:05 PM..
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Unread 04-11-2006, 12:15 PM   #5
roadhog
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great. thanks for the quick replies. I suspected this is not an overly difficult mod. I think I'll just do it myself. thanks for the link to jeepin.com as well.

cheers
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Unread 04-11-2006, 12:46 PM   #6
Matt Gertsch
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www.summitracing.com You'll want the B&M Super Cooler like Jason used.
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Unread 04-11-2006, 01:22 PM   #7
roadhog
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Quote:
Originally Posted by mgertsch
www.summitracing.com You'll want the B&M Super Cooler like Jason used.
in fact I just ordered the B&M kit from JEG's based on Jason's recommendation.

So, here goes nuthin'...
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Unread 04-11-2006, 03:04 PM   #8
98_classic
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just out of curiosity how do you know if your tranny already has a cooler on it. my 98 classic has a mopar hitch on it, so im asuming it came from the factory with it on. if it came with a hitch does that mean that it also has the cooler?
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Unread 04-11-2006, 03:13 PM   #9
Grumman
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It would look like a small/mini radiator that is mounted in front of the regular radiator.

http://www.technicalgarage.com/archi...l/DSCF0003.JPG
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Unread 04-11-2006, 03:15 PM   #10
98_classic
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wait if its in front of the radiator how does it cool the tranny? (sorry im new at this)
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Unread 04-12-2006, 03:19 PM   #11
Grumman
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External Transmission coolers work like a radiator for the tranny. they are connected to the transmisssion via hoses and they cool the transmission fluid so that it does not get too hot and break down.

Heat is the Enemy of ANY automatic tranny and is what usually causes most automatic transmission problems.

http://www.perma-cool.com/Catalog/Cat_page02.html
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